java小程序计算器

❶ 编写java程序简单计算器

主要涉及的知识点: 类的写法, 以及方法的调用 .建议多做练习. 如果有看不懂的地方. 可以继续追问,一起讨论.

参考代码如下

//Number类
classNumber{

	privateintn1;//私有的整型数据成员n1
	privateintn2;//私有的整型数据成员n2

	//通过构造函数给n1和n2赋值
	publicNumber(intn1,intn2){
		this.n1=n1;
		this.n2=n2;
	}

	//加法
	publicintaddition(){
		returnn1+n2;
	}

	//减法
	publicintsubtration(){
		returnn1-n2;
	}

	//乘法
	publicintmultiplication(){
		returnn1*n2;
	}

	//除法(可能除不尽,所以使用double作为返回类型)
	publicdoubledivision(){
		returnn1*1.0/n2;//通过n1*1.0把计算结果转换成double类型.
	}
}

//Exam4类
publicclassExam4{
	publicstaticvoidmain(String[]args){
		Numbernumber=newNumber(15,6);//创建Number类的对象
		//下面的是调用方法得到返回值进行输出显示
		System.out.println("加法"+number.addition());
		System.out.println("减法"+number.subtration());
		System.out.println("乘法"+number.multiplication());
		System.out.println("除法"+number.division());

	}
}

❷ 用java语言编写一个计算器的程序

import java.util.*;

public class Test {

public static void main(String[] args) {

Scanner input = new Scanner(System.in);

System.out.println("*****************简易计算器****************");
System.out.println("*\t\t\t\t\t*");
System.out.println("* 使用说明： 1.加法 2.减法 3.乘法 4.除法 *");
System.out.println("*\t\t\t\t\t*");
System.out.println("*****************************************");

for(int i=0;i<100;i++){
System.out.print("\n请选择运算规则：");
int num = input.nextInt();
switch(num){
case 1:
System.out.println("\n******你选择了加法******\n");
System.out.print("请输入第1个加数:");
int jiashu1 = input.nextInt();
System.out.print("请输入第2个加数:");
int jiashu2 = input.nextInt();
System.out.println("运算结果为:" + jiashu1 + " + " + jiashu1 + " = " + (jiashu1 + jiashu2));
break;
case 2:
System.out.println("\n******你选择了减法******\n");
System.out.print("请输入被减数:");
int jianshu1 = input.nextInt();
System.out.print("请输入减数:");
int jianshu2 = input.nextInt();
System.out.println("运算结果为:" + jianshu1 + " - " + jianshu2 + " = " + (jianshu1 - jianshu2));
break;
case 3:
System.out.println("\n******你选择了乘法******\n");
System.out.print("请输入第1个因数:");
int chengfa1 = input.nextInt();
System.out.print("请输入第2个因数:");
int chengfa2 = input.nextInt();
System.out.println("运算结果为:" + chengfa1 + " * " + chengfa2 + " = " + (chengfa1 * chengfa2));
break;
case 4:
System.out.println("\n******你选择了除法******\n");
System.out.print("请输入被除数:");
double chufa1 = input.nextInt();
System.out.print("请输入除数:");
double chufa2 = input.nextInt();
System.out.println("运算结果为:" + chufa1 + " / " + chufa2 + " = " + (chufa1 / chufa2) + " 余 " + (chufa1 % chufa2));
break;
default:
System.out.println("\n你的选择有错，请重新选择!");
break;
}

}
}

}

❸ 用Java编写一个简单的计算器程序

import java.awt.*;
import java.awt.event.*;

public class CalcAppDemo extends Frame{
private TextField t_result;
private Panel p_main; //主面板
private Panel p_num; //数字面板
private Panel p_oper; //操作符面板
private Panel p_show; //显示面板
private Button b_num[]; //数字按钮
private Button b_oper[]; //操作符面板

public CalcAppDemo(String title){
setTitle(title);
t_result = new TextField("0.0", 21);
p_main = new Panel();
p_num = new Panel();
p_oper = new Panel();
p_show = new Panel();
p_main.setLayout(new BorderLayout());
p_num.setLayout(new GridLayout(4, 3, 1, 1));
p_oper.setLayout(new GridLayout(4, 2, 1, 1));

b_num = new Button[12];
for(int i=0; i<9; i++)
{
b_num[i] = new Button(new Integer(i+1).toString());
}
b_num[9] = new Button("0");
b_num[10] = new Button("cls");
b_num[11] = new Button(".");
for(int i=0; i<12; i++)
{
p_num.add(b_num[i]);
}

b_oper = new Button[8];
b_oper[0] = new Button("+");
b_oper[1] = new Button("-");
b_oper[2] = new Button("*");
b_oper[3] = new Button("/");
b_oper[4] = new Button("pow");
b_oper[5] = new Button("sqrt");
b_oper[6] = new Button("+/-");
b_oper[7] = new Button("=");
for(int i=0; i<8; i++) //
{
p_oper.add(b_oper[i]);
}

t_result.setEditable(false);
p_show.add(t_result, BorderLayout.NORTH);
p_main.add(p_show, BorderLayout.NORTH);
p_main.add(p_num, BorderLayout.WEST);
p_main.add(p_oper, BorderLayout.EAST);
this.add(p_main, BorderLayout.CENTER);
setSize(400, 400);
setResizable(false);
pack();

this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
ButtonListener b1 = new ButtonListener();
for(int i=0; i<12; i++)
{
b_num[i].addActionListener(b1);
}
for(int i=0; i<8; i++)
{
b_oper[i].addActionListener(b1);
}
}

class ButtonListener implements ActionListener
{
private String lastOp; //存储上一此操作符
private String strVal; //存储数字对应的字符串
private double total; //总数
private double number; //存储新输入的数
private boolean firsttime; //判断是否第一次按下的是操作符按钮
private boolean operatorPressed;//判断是否已经按过操作符按钮

ButtonListener()
{
firsttime = true;
strVal = "";
}

//事件处理器
public void actionPerformed(ActionEvent e)
{
String s = ((Button)e.getSource()).getLabel().trim();

if(Character.isDigit(s.charAt(0)))
{//判断是操作数还是操作符
handleNumber(s);
}
else
{
calculate(s);
}
}

//判断是一元操作符还是二元操作符，并根据操作符类型做计算
void calculate(String op)
{
operatorPressed = true;

if(firsttime&&! isUnary(op))
{
total = getNumberOnDisplay();
firsttime = false;
}
if(isUnary(op))
{
handleUnaryOp(op);
}
else if(lastOp != null)
{
handleBinaryOp(lastOp);
}
if(! isUnary(op))
{
lastOp = op;
}
}

//判断是否一元操作符
boolean isUnary(String s)
{
return s.equals("=")
||s.equals("cls")||s.equals("sqrt")
||s.equals("+/-")||s.equals(".");
}

//处理一元操作符
void handleUnaryOp(String op)
{
if(op.equals("+/-"))
{//
number = negate(getNumberOnDisplay() + "");
t_result.setText("");
t_result.setText(number + "");
return;
}else if(op.equals("."))
{
handleDecPoint();
return;
}else if(op.equals("sqrt"))
{
number = Math.sqrt(getNumberOnDisplay());
t_result.setText("");
t_result.setText(number + "");
return;
}else if(op.equals("="))
{//
if(lastOp!= null && !isUnary(lastOp))
{
handleBinaryOp(lastOp);
}
lastOp = null;
firsttime = true;
return;
}else
{
clear();
}
}

//处理二元运算符
void handleBinaryOp(String op)
{
if(op.equals("+"))
{
total +=number;
}else if(op.equals("-"))
{
total -=number;
}else if(op.equals("*"))
{
total *=number;
}else if(op.equals("/"))
{
try
{
total /=number;
}catch(ArithmeticException ae){}
}else if(op.equals("pow"))
total = Math.pow(total, number);
//t_result.setText("");
lastOp = null;
// strVal = "";
number = 0;
t_result.setText(total + "");
}

//该方法用于处理数字按钮
void handleNumber(String s)
{
if(!operatorPressed)
{
strVal += s;
}else
{
operatorPressed = false;
strVal = s;
}
//
number = new Double(strVal).doubleValue();
t_result.setText("");
t_result.setText(strVal);
}

//该方法用于按下"."按钮
void handleDecPoint()
{
operatorPressed = false;
//
if(strVal.indexOf(".")<0)
{
strVal += ".";
}
t_result.setText("");
t_result.setText(strVal);
}

//该方法用于将一个数求反
double negate(String s)
{
operatorPressed = false;
//如果是一个整数，去掉小数点后面的0
if(number == (int)number)
{
s = s.substring(0,s.indexOf("."));
}

//如果无"-"增加在该数的前面
if(s.indexOf("-")<0)
{
strVal = "-" + s;
}
else
{
strVal = s.substring(1);
}
return new Double(strVal).doubleValue();
}

//将显示框中的值转换成Double
double getNumberOnDisplay()
{
return new Double(t_result.getText()).doubleValue();
}

//清除屏幕并设置所有的标识
void clear()
{
firsttime = true;
lastOp = null;
strVal = "";
total = 0;
number = 0;
t_result.setText("0");
}
}

public static void main(String[] args) {
CalcAppDemo c = new CalcAppDemo("简单的计算器程序");
c.setVisible(true);
}

}

❹ 求java编写的租金计算器小程序

importjava.awt.Container;
importjava.awt.GridLayout;
importjava.awt.event.ActionEvent;
importjava.awt.event.ActionListener;
importjava.awt.event.FocusAdapter;
importjava.awt.event.FocusEvent;
importjava.sql.Date;
importjava.util.Calendar;

importjavax.swing.JButton;
importjavax.swing.JFrame;
importjavax.swing.JLabel;
importjavax.swing.JTextField;

publicclassZuJinextendsJFrame{
	/**
	*（结束日期-开始日期）÷30×月租金+业务费用+其他费用＝总费用
	〔（结束日期-开始日期）÷30×月租金+业务费用+其他费用〕÷合租人员＝平均费用
	需要弹出一个租金计算器对话框分为租金计算信息与租金计算结果两部分
	
	*/
	publicZuJin(){
		Containerc=getContentPane();
		c.setLayout(newGridLayout(5,4));
		JLabelj1=newJLabel("开始日期");
		c.add(j1);
		JTextFieldjt1=newJTextField(10);
		c.add(jt1);
		JLabelj2=newJLabel("结束日期");
		c.add(j2);
		JTextFieldjt2=newJTextField("");
		c.add(jt2);
		JLabelj3=newJLabel("月租金(元)");
		c.add(j3);
		JTextFieldjt3=newJTextField(5);
		c.add(jt3);
		JLabelj4=newJLabel("业务费(元)");
		c.add(j4);
		JTextFieldjt4=newJTextField(5);
		c.add(jt4);
		JLabelj5=newJLabel("其他费用(元)");
		c.add(j5);
		JTextFieldjt5=newJTextField(5);
		c.add(jt5);
		JLabelj6=newJLabel("合租人员数量");
		c.add(j6);
		JTextFieldjt6=newJTextField(3);
		c.add(jt6);
		JLabelj7=newJLabel("总费用(元)");
		c.add(j7);
		JTextFieldjt7=newJTextField(5);
		jt7.setEditable(false);
		c.add(jt7);
		JLabelj8=newJLabel("平均费用(元)");
		c.add(j8);
		JTextFieldjt8=newJTextField(5);
		jt8.setEditable(false);
		c.add(jt8);
		JButtonjb1=newJButton("计算");
		c.add(jb1);
	jt1.addFocusListener(newFocusAdapter()
	{
	@Override
	publicvoidfocusGained(FocusEvente)
	{	
	if(jt1.getText().equals("格式为：0000-00-00")){
			jt1.setText("");
					}
	
	}
	
	@Override
	publicvoidfocusLost(FocusEvente)
	{	
		if(jt1.getText().equals("")){
		jt1.setText("格式为：0000-00-00");
					}
	
	}
	
	});
	jt2.addFocusListener(newFocusAdapter()
	{
	@Override
	publicvoidfocusGained(FocusEvente)
	{	
	if(jt2.getText().equals("格式为：0000-00-00")){
			jt2.setText("");
					}
	
	}
	
	@Override
	publicvoidfocusLost(FocusEvente)
	{	
		if(jt2.getText().equals("")){
	jt2.setText("格式为：0000-00-00");
					}
	
	}
	
	});
		jb1.addActionListener(newActionListener(){
			
			@Override
			publicvoidactionPerformed(ActionEventarg0){
				//TODOAuto-generatedmethodstub
				Dated1=Date.valueOf(jt1.getText());//开始日期
				Dated2=Date.valueOf(jt2.getText());//结束日期
				Calendarc1=Calendar.getInstance();
				c1.setTime(d1);
				Calendarc2=Calendar.getInstance();
				c2.setTime(d2);
				intday1=c1.get(Calendar.DAY_OF_YEAR);
				intday2=c2.get(Calendar.DAY_OF_YEAR);
				intdays=day2-day1;
		doublemoney1=Double.valueOf(jt3.getText());//月租金
		doublemoney2=Double.valueOf(jt4.getText());//业务费
		doublemoney3=Double.valueOf(jt5.getText());//其他费用
		intman=Integer.valueOf(jt6.getText());//人数
		doublemoney4=days/30*money1+money2+money3;
				doublemoney5=0.0;
				if(man!=0){
					money5=money4/man;
				}
				else{
					money5=money4;
				}
				
				jt7.setText(String.valueOf(money4));
				jt8.setText(String.valueOf(money5));
				
			}
		});
		
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(400,400,500,300);
		setVisible(true);
		setTitle("租金计算器");
		
	}
	publicstaticvoidmain(String[]args){
		ZuJinzj=newZuJin();

	}
}

丑是丑了点 用还是可以用的。

❺ 请问谁能用java语言,为我写一个计算器的小程序

<!--开始 -->
<STYLE>BODY {
BACKGROUND-ATTACHMENT: fixed; BACKGROUND-COLOR: #edf0e1; COLOR: #0001fc; FONT-FAMILY: "宋体", "Arial", "Times New Roman"; FONT-SIZE: 9pt
}
TD {
FONT-FAMILY: "宋体", "Arial Narrow", "Times New Roman"; FONT-SIZE: 9pt; font-color: #000000
}
</STYLE>

<SCRIPT language=javascript>
<!--
var endNumber=true
var mem=0
var carry=10
var hexnum="0123456789abcdef"
var angle="d"
var stack=""
var level="0"
var layer=0

//数字键

function inputkey(key)
{
var index=key.charCodeAt(0);
if ((carry==2 && (index==48 || index==49))
|| (carry==8 && index>=48 && index<=55)
|| (carry==10 && (index>=48 && index<=57 || index==46))
|| (carry==16 && ((index>=48 && index<=57) || (index>=97 && index<=102))))
if(endNumber)
{
endNumber=false
document.calc.display.value = key
}
else if(document.calc.display.value == null || document.calc.display.value == "0")
document.calc.display.value = key
else
document.calc.display.value += key
}

function changeSign()
{
if (document.calc.display.value!="0")
if(document.calc.display.value.substr(0,1) == "-")
document.calc.display.value = document.calc.display.value.substr(1)
else
document.calc.display.value = "-" + document.calc.display.value
}

//函数键

function inputfunction(fun,shiftfun)
{
endNumber=true
if (document.calc.shiftf.checked)
document.calc.display.value=decto(funcalc(shiftfun,(todec(document.calc.display.value,carry))),carry)
else
document.calc.display.value=decto(funcalc(fun,(todec(document.calc.display.value,carry))),carry)
document.calc.shiftf.checked=false
document.calc.hypf.checked=false
inputshift()
}

function inputtrig(trig,arctrig,hyp,archyp)
{
if (document.calc.hypf.checked)
inputfunction(hyp,archyp)
else
inputfunction(trig,arctrig)
}

//运算符

function operation(join,newlevel)
{
endNumber=true
var temp=stack.substr(stack.lastIndexOf("(")+1)+document.calc.display.value
while (newlevel!=0 && (newlevel<=(level.charAt(level.length-1))))
{
temp=parse(temp)
level=level.slice(0,-1)
}
if (temp.match(/^(.*\d[\+\-\*\/\%\^\&\|x])?([+-]?[0-9a-f\.]+)$/))
document.calc.display.value=RegExp.$2
stack=stack.substr(0,stack.lastIndexOf("(")+1)+temp+join
document.calc.operator.value=" "+join+" "
level=level+newlevel

}

//括号

function addbracket()
{
endNumber=true
document.calc.display.value=0
stack=stack+"("
document.calc.operator.value=" "
level=level+0

layer+=1
document.calc.bracket.value="(="+layer
}

function disbracket()
{
endNumber=true
var temp=stack.substr(stack.lastIndexOf("(")+1)+document.calc.display.value
while ((level.charAt(level.length-1))>0)
{
temp=parse(temp)
level=level.slice(0,-1)
}

document.calc.display.value=temp
stack=stack.substr(0,stack.lastIndexOf("("))
document.calc.operator.value=" "
level=level.slice(0,-1)

layer-=1
if (layer>0)
document.calc.bracket.value="(="+layer
else
document.calc.bracket.value=""
}

//等号

function result()
{
endNumber=true
while (layer>0)
disbracket()
var temp=stack+document.calc.display.value
while ((level.charAt(level.length-1))>0)
{
temp=parse(temp)
level=level.slice(0,-1)
}

document.calc.display.value=temp
document.calc.bracket.value=""
document.calc.operator.value=""
stack=""
level="0"
}

//修改键

function backspace()
{
if (!endNumber)
{
if(document.calc.display.value.length>1)
document.calc.display.value=document.calc.display.value.substring(0,document.calc.display.value.length - 1)
else
document.calc.display.value=0
}
}

function clearall()
{
document.calc.display.value=0
endNumber=true
stack=""
level="0"
layer=""
document.calc.operator.value=""
document.calc.bracket.value=""
}

//转换键

function inputChangCarry(newcarry)
{
endNumber=true
document.calc.display.value=(decto(todec(document.calc.display.value,carry),newcarry))
carry=newcarry

document.calc.sin.disabled=(carry!=10)
document.calc.cos.disabled=(carry!=10)
document.calc.tan.disabled=(carry!=10)
document.calc.bt.disabled=(carry!=10)
document.calc.pi.disabled=(carry!=10)
document.calc.e.disabled=(carry!=10)
document.calc.kp.disabled=(carry!=10)

document.calc.k2.disabled=(carry<=2)
document.calc.k3.disabled=(carry<=2)
document.calc.k4.disabled=(carry<=2)
document.calc.k5.disabled=(carry<=2)
document.calc.k6.disabled=(carry<=2)
document.calc.k7.disabled=(carry<=2)
document.calc.k8.disabled=(carry<=8)
document.calc.k9.disabled=(carry<=8)
document.calc.ka.disabled=(carry<=10)
document.calc.kb.disabled=(carry<=10)
document.calc.kc.disabled=(carry<=10)
document.calc.kd.disabled=(carry<=10)
document.calc.ke.disabled=(carry<=10)
document.calc.kf.disabled=(carry<=10)

}

function inputChangAngle(angletype)
{
endNumber=true
angle=angletype
if (angle=="d")
document.calc.display.value=radiansToDegress(document.calc.display.value)
else
document.calc.display.value=degressToRadians(document.calc.display.value)
endNumber=true
}

function inputshift()
{
if (document.calc.shiftf.checked)
{
document.calc.bt.value="deg "
document.calc.ln.value="exp "
document.calc.log.value="expd"

if (document.calc.hypf.checked)
{
document.calc.sin.value="ahs "
document.calc.cos.value="ahc "
document.calc.tan.value="aht "
}
else
{
document.calc.sin.value="asin"
document.calc.cos.value="acos"
document.calc.tan.value="atan"
}

document.calc.sqr.value="x^.5"
document.calc.cube.value="x^.3"

document.calc.floor.value="小数"
}
else
{
document.calc.bt.value="d.ms"
document.calc.ln.value=" ln "
document.calc.log.value="log "

if (document.calc.hypf.checked)
{
document.calc.sin.value="hsin"
document.calc.cos.value="hcos"
document.calc.tan.value="htan"
}
else
{
document.calc.sin.value="sin "
document.calc.cos.value="cos "
document.calc.tan.value="tan "
}

document.calc.sqr.value="x^2 "
document.calc.cube.value="x^3 "

document.calc.floor.value="取整"
}

}
//存储器部分

function clearmemory()
{
mem=0
document.calc.memory.value=" "
}

function getmemory()
{
endNumber=true
document.calc.display.value=decto(mem,carry)
}

function putmemory()
{
endNumber=true
if (document.calc.display.value!=0)
{
mem=todec(document.calc.display.value,carry)
document.calc.memory.value=" M "
}
else
document.calc.memory.value=" "
}

function addmemory()
{
endNumber=true
mem=parseFloat(mem)+parseFloat(todec(document.calc.display.value,carry))
if (mem==0)
document.calc.memory.value=" "
else
document.calc.memory.value=" M "
}

function multimemory()
{
endNumber=true
mem=parseFloat(mem)*parseFloat(todec(document.calc.display.value,carry))
if (mem==0)
document.calc.memory.value=" "
else
document.calc.memory.value=" M "
}

//十进制转换

function todec(num,oldcarry)
{
if (oldcarry==10 || num==0) return(num)
var neg=(num.charAt(0)=="-")
if (neg) num=num.substr(1)
var newnum=0
for (var index=1;index<=num.length;index++)
newnum=newnum*oldcarry+hexnum.indexOf(num.charAt(index-1))
if (neg)
newnum=-newnum
return(newnum)
}

function decto(num,newcarry)
{
var neg=(num<0)
if (newcarry==10 || num==0) return(num)
num=""+Math.abs(num)
var newnum=""
while (num!=0)
{
newnum=hexnum.charAt(num%newcarry)+newnum
num=Math.floor(num/newcarry)
}
if (neg)
newnum="-"+newnum
return(newnum)
}

//表达式解析

function parse(string)
{
if (string.match(/^(.*\d[\+\-\*\/\%\^\&\|x\<])?([+-]?[0-9a-f\.]+)([\+\-\*\/\%\^\&\|x\<])([+-]?[0-9a-f\.]+)$/))
return(RegExp.$1+cypher(RegExp.$2,RegExp.$3,RegExp.$4))
else
return(string)
}

//数学运算和位运算

function cypher(left,join,right)
{
left=todec(left,carry)
right=todec(right,carry)
if (join=="+")
return(decto(parseFloat(left)+parseFloat(right),carry))
if (join=="-")
return(decto(left-right,carry))
if (join=="*")
return(decto(left*right,carry))
if (join=="/" && right!=0)
return(decto(left/right,carry))
if (join=="%")
return(decto(left%right,carry))
if (join=="&")
return(decto(left&right,carry))
if (join=="|")
return(decto(left|right,carry))
if (join=="^")
return(decto(Math.pow(left,right),carry))
if (join=="x")
return(decto(left^right,carry))
if (join=="<")
return(decto(left<<right,carry))
alert("除数不能为零")
return(left)
}

//函数计算

function funcalc(fun,num)
{
with(Math)
{
if (fun=="pi")
return(PI)
if (fun=="e")
return(E)

if (fun=="abs")
return(abs(num))
if (fun=="ceil")
return(ceil(num))
if (fun=="round")
return(round(num))

if (fun=="floor")
return(floor(num))
if (fun=="deci")
return(num-floor(num))

if (fun=="ln" && num>0)
return(log(num))
if (fun=="exp")
return(exp(num))
if (fun=="log" && num>0)
return(log(num)*LOG10E)
if (fun=="expdec")
return(pow(10,num))

if (fun=="cube")
return(num*num*num)
if (fun=="cubt")
return(pow(num,1/3))
if (fun=="sqr")
return(num*num)
if (fun=="sqrt" && num>=0)
return(sqrt(num))

if (fun=="!")
return(factorial(num))

if (fun=="recip" && num!=0)
return(1/num)

if (fun=="dms")
return(dms(num))
if (fun=="deg")
return(deg(num))

if (fun=="~")
return(~num)

if (angle=="d")
{
if (fun=="sin")
return(sin(degressToRadians(num)))
if (fun=="cos")
return(cos(degressToRadians(num)))
if (fun=="tan")
return(tan(degressToRadians(num)))

if (fun=="arcsin" && abs(num)<=1)
return(radiansToDegress(asin(num)))
if (fun=="arccos" && abs(num)<=1)
return(radiansToDegress(acos(num)))
if (fun=="arctan")
return(radiansToDegress(atan(num)))
}
else
{
if (fun=="sin")
return(sin(num))
if (fun=="cos")
return(cos(num))
if (fun=="tan")
return(tan(num))

if (fun=="arcsin" && abs(num)<=1)
return(asin(num))
if (fun=="arccos" && abs(num)<=1)
return(acos(num))
if (fun=="arctan")
return(atan(num))
}

if (fun=="hypsin")
return((exp(num)-exp(0-num))*0.5)
if (fun=="hypcos")
return((exp(num)+exp(-num))*0.5)
if (fun=="hyptan")
return((exp(num)-exp(-num))/(exp(num)+exp(-num)))

if (fun=="ahypsin" | fun=="hypcos" | fun=="hyptan")
{
alert("对不起,公式还没有查到!")
return(num)
}

alert("超出函数定义范围")
return(num)
}
}

function factorial(n)
{
n=Math.abs(parseInt(n))
var fac=1
for (;n>0;n-=1)
fac*=n
return(fac)
}

function dms(n)
{
var neg=(n<0)
with(Math)
{
n=abs(n)
var d=floor(n)
var m=floor(60*(n-d))
var s=(n-d)*60-m
}
var dms=d+m/100+s*0.006
if (neg)
dms=-dms
return(dms)
}

function deg(n)
{
var neg=(n<0)
with(Math)
{
n=abs(n)
var d=floor(n)
var m=floor((n-d)*100)
var s=(n-d)*100-m
}
var deg=d+m/60+s/36
if (neg)
deg=-deg
return(deg)
}

function degressToRadians(degress)
{
return(degress*Math.PI/180)
}

function radiansToDegress(radians)
{
return(radians*180/Math.PI)
}

//界面

//-->
</SCRIPT>
<!--written by GoldHuman li hai--><!--2000.8-->
<META content="Microsoft FrontPage 4.0" name=GENERATOR></HEAD>
<BODY>
<DIV align=center>
<FORM name=calc>
<TABLE height=250 width=500 border=1>
<TBODY>
<TR>
<TD height=50>
<TABLE width=500>
<TBODY>
<TR>
<TD></TD>
<TD>
<DIV align=center><INPUT readOnly size=40 value=0 name=display> </DIV></TD></TR></TBODY></TABLE></TD></TR>
<TR>
<TD>
<TABLE width=500>
<TBODY>
<TR>
<TD width=290><INPUT onclick=inputChangCarry(16) type=radio name=carry> 十六进制 <INPUT onclick=inputChangCarry(10) type=radio CHECKED name=carry> 十进制 <INPUT onclick=inputChangCarry(8) type=radio name=carry> 八进制 <INPUT onclick=inputChangCarry(2) type=radio name=carry> 二进制 </TD>
<TD></TD>
<TD width=135><INPUT onclick="inputChangAngle('d')" type=radio CHECKED value=d name=angle> 角度制 <INPUT onclick="inputChangAngle('r')" type=radio value=r name=angle> 弧度制 </TD></TR></TBODY></TABLE>
<TABLE width=500>
<TBODY>
<TR>
<TD width=170><INPUT onclick=inputshift() type=checkbox name=shiftf>上档功能 <INPUT onclick=inputshift() type=checkbox name=hypf>双曲函数 </TD>
<TD><INPUT style="BACKGROUND-COLOR: lightgrey" readOnly size=3 name=bracket> <INPUT style="BACKGROUND-COLOR: lightgrey" readOnly size=3 name=memory> <INPUT style="BACKGROUND-COLOR: lightgrey" readOnly size=3 name=operator> </TD>
<TD width=183><INPUT style="COLOR: red" onclick=backspace() type=button value=" 退格 "> <INPUT style="COLOR: red" onclick="document.calc.display.value = 0 " type=button value=" 清屏 "> <INPUT style="COLOR: red" onclick=clearall() type=button value=" 全清"> </TD></TR></TBODY></TABLE>
<TABLE width=500>
<TBODY>
<TR>
<TD>
<TABLE>
<TBODY>
<TR align=middle>
<TD><INPUT style="COLOR: blue" onclick="inputfunction('pi','pi')" type=button value=" PI " name=pi> </TD>
<TD><INPUT style="COLOR: blue" onclick="inputfunction('e','e')" type=button value=" E " name=e> </TD>
<TD><INPUT style="COLOR: #ff00ff" onclick="inputfunction('dms','deg')" type=button value=d.ms name=bt> </TD></TR>
<TR align=middle>
<TD><INPUT style="COLOR: #ff00ff" onclick=addbracket() type=button value=" ( "> </TD>
<TD><INPUT style="COLOR: #ff00ff" onclick=disbracket() type=button value=" ) "> </TD>
<TD><INPUT style="COLOR: #ff00ff" onclick="inputfunction('ln','exp')" type=button value=" ln " name=ln> </TD></TR>
<TR align=middle>
<TD><INPUT style="COLOR: #ff00ff" onclick="inputtrig('sin','arcsin','hypsin','ahypsin')" type=button value="sin " name=sin> </TD>
<TD><INPUT style="COLOR: #ff00ff" onclick="operation('^',7)" type=button value="x^y "> </TD>
<TD><INPUT style="COLOR: #ff00ff" onclick="inputfunction('log','expdec')" type=button value="log " name=log> </TD></TR>
<TR align=middle>
<TD><INPUT style="COLOR: #ff00ff" onclick="inputtrig('cos','arccos','hypcos','ahypcos')" type=button value="cos " name=cos> </TD>
<TD><INPUT style="COLOR: #ff00ff" onclick="inputfunction('cube','cubt')" type=button value="x^3 " name=cube> </TD>
<TD><INPUT style="COLOR: #ff00ff" onclick="inputfunction('!','!')" type=button value=" n! "> </TD></TR>
<TR align=middle>
<TD><INPUT style="COLOR: #ff00ff" onclick="inputtrig('tan','arctan','hyptan','ahyptan')" type=button value="tan " name=tan> </TD>
<TD><INPUT style="COLOR: #ff00ff" onclick="inputfunction('sqr','sqrt')" type=button value="x^2 " name=sqr> </TD>
<TD><INPUT style="COLOR: #ff00ff" onclick="inputfunction('recip','recip')" type=button value="1/x "> </TD></TR></TBODY></TABLE></TD>
<TD width=30></TD>
<TD>
<TABLE>
<TBODY>
<TR>
<TD><INPUT style="COLOR: red" onclick=putmemory() type=button value=" 储存 "> </TD></TR>
<TR>
<TD><INPUT style="COLOR: red" onclick=getmemory() type=button value=" 取存 "> </TD></TR>
<TR>
<TD><INPUT style="COLOR: red" onclick=addmemory() type=button value=" 累存 "> </TD></TR>
<TR>
<TD><INPUT style="COLOR: red" onclick=multimemory() type=button value=" 积存 "> </TD></TR>
<TR>
<TD height=33><INPUT style="COLOR: red" onclick=clearmemory() type=button value=" 清存 "> </TD></TR></TBODY></TABLE></TD>
<TD width=30></TD>
<TD>
<TABLE>
<TBODY>
<TR align=middle>
<TD><INPUT style="COLOR: blue" onclick="inputkey('7')" type=button value=" 7 " name=k7> </TD>
<TD><INPUT style="COLOR: blue" onclick="inputkey('8')" type=button value=" 8 " name=k8> </TD>
<TD><INPUT style="COLOR: blue" onclick="inputkey('9')" type=button value=" 9 " name=k9> </TD>
<TD><INPUT style="COLOR: red" onclick="operation('/',6)" type=button value=" / "> </TD>
<TD><INPUT style="COLOR: red" onclick="operation('%',6)" type=button value=取余> </TD>
<TD><INPUT style="COLOR: red" onclick="operation('&',3)" type=button value=" 与 "> </TD></TR>
<TR align=middle>
<TD><INPUT style="COLOR: blue" onclick="inputkey('4')" type=button value=" 4 " name=k4> </TD>
<TD><INPUT style="COLOR: blue" onclick="inputkey('5')" type=button value=" 5 " name=k5> </TD>
<TD><INPUT style="COLOR: blue" onclick="inputkey('6')" type=button value=" 6 " name=k6> </TD>
<TD><INPUT style="COLOR: red" onclick="operation('*',6)" type=button value=" * "> </TD>
<TD><INPUT style="COLOR: red" onclick="inputfunction('floor','deci')" type=button value=取整 name=floor> </TD>
<TD><INPUT style="COLOR: red" onclick="operation('|',1)" type=button value=" 或 "> </TD></TR>
<TR align=middle>
<TD><INPUT style="COLOR: blue" onclick="inputkey('1')" type=button value=" 1 "> </TD>
<TD><INPUT style="COLOR: blue" onclick="inputkey('2')" type=button value=" 2 " name=k2> </TD>
<TD><INPUT style="COLOR: blue" onclick="inputkey('3')" type=button value=" 3 " name=k3> </TD>
<TD><INPUT style="COLOR: red" onclick="operation('-',5)" type=button value=" - "> </TD>
<TD><INPUT style="COLOR: red" onclick="operation('<',4)" type=button value=左移> </TD>
<TD><INPUT style="COLOR: red" onclick="inputfunction('~','~')" type=button value=" 非 "> </TD></TR>
<TR align=middle>
<TD><INPUT style="COLOR: blue" onclick="inputkey('0')" type=button value=" 0 "> </TD>
<TD><INPUT style="COLOR: blue" onclick=changeSign() type=button value=+/-> </TD>
<TD><INPUT style="COLOR: blue" onclick="inputkey('.')" type=button value=" . " name=kp> </TD>
<TD><INPUT style="COLOR: red" onclick="operation('+',5)" type=button value=" + "> </TD>
<TD><INPUT style="COLOR: red" onclick=result() type=button value=" ＝ "> </TD>
<TD><INPUT style="COLOR: red" onclick="operation('x',2)" type=button value=异或> </TD></TR>
<TR align=middle>
<TD><INPUT style="COLOR: blue" disabled onclick="inputkey('a')" type=button value=" A " name=ka> </TD>
<TD><INPUT style="COLOR: blue" disabled onclick="inputkey('b')" type=button value=" B " name=kb> </TD>
<TD><INPUT style="COLOR: blue" disabled onclick="inputkey('c')" type=button value=" C " name=kc> </TD>
<TD><INPUT style="COLOR: blue" disabled onclick="inputkey('d')" type=button value=" D " name=kd> </TD>
<TD><INPUT style="COLOR: blue" disabled onclick="inputkey('e')" type=button value=" E" name=ke> </TD>
<TD><INPUT style="COLOR: blue" disabled onclick="inputkey('f')" type=button value=" F" name=kf> </TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></FORM></DIV><%referer=Request.ServerVariables ("HTTP_REFERER")%>
<!--结束 -->

❻ 编写java application程序实现一个简易计算器

Java计算器源代码：

importjava.awt.*;

importjava.awt.event.*;

importjavax.swing.*;

/**********************Java计算器主类*********************/

{

JFramef;

JMenumEdit;

JMenumView;

JMenumHelp;

JMenuItemmCopy;

JMenuItemmPaste;

JTextFieldtResult;

JButtonbNumber;

JButtonbOperator;

JButtonbOther;

JButtonbM;

booleanisDouble=false;//是否为实数

intopFlag=-1;

staticdoublet1=0,t2=0,t3=0,result=0;

staticintopflag1=-1,opflag2=-1,flag=0,resflag=1;

intpreOp,currentOp=0;//标准位

doubleop1=0,op2=0;//操作数

doublen3;

StringBufferbuf=newStringBuffer(20);

StringBufferBoard=newStringBuffer(20);//剪贴板

StringBuffermemory=newStringBuffer(20);//M系列

StringBufferstr=newStringBuffer();

//Java计算器构造器

publicSunnyCalculator()

{

f=newJFrame("Sunny计算器_杨梅树的盔甲");

ContainercontentPane=f.getContentPane();

/**************************Java计算器菜单的创建*****************************/

JMenuBarmBar=newJMenuBar();

mBar.setOpaque(true);

mEdit=newJMenu("编辑(E)");

mEdit.setMnemonic(KeyEvent.VK_E);

mCopy=newJMenuItem("复制(C)");

mEdit.add(mCopy);

mPaste=newJMenuItem("粘贴(P)");

mEdit.add(mPaste);

mView=newJMenu("查看(V)");

mView.setMnemonic(KeyEvent.VK_V);

mView.add(newJMenuItem("标准型"));

mView.add(newJMenuItem("科学型"));

mView.addSeparator();

mView.add(newJMenuItem("查看分组"));

mHelp=newJMenu("帮助(H)");

mHelp.setMnemonic(KeyEvent.VK_H);

mHelp.add(newJMenuItem("帮助主题"));

mHelp.addSeparator();

mHelp.add(newJMenuItem("关于计算器"));

mBar.add(mEdit);

mBar.add(mView);

mBar.add(mHelp);

f.setJMenuBar(mBar);

contentPane.setLayout(newBorderLayout());

JPanelpTop=newJPanel();

tResult=newJTextField("0.",26);

tResult.setHorizontalAlignment(JTextField.RIGHT);

tResult.setEditable(false);

pTop.add(tResult);

contentPane.add(pTop,BorderLayout.NORTH);

JPanelpBottom=newJPanel();

pBottom.setLayout(newBorderLayout());

JPanelpLeft=newJPanel();

pLeft.setLayout(newGridLayout(5,1,3,3));

bM=newJButton("");

bM.setEnabled(false);

pLeft.add(bM);

/*************************Java计算器功能键定义***************************/

bOther=newJButton("MC");

bOther.addActionListener(this);

bOther.setForeground(Color.red);

bOther.setMargin(newInsets(3,2,3,2));

pLeft.add(bOther);

bOther=newJButton("MR");

bOther.addActionListener(this);

bOther.setForeground(Color.red);

bOther.setMargin(newInsets(3,2,3,2));

pLeft.add(bOther);

bOther=newJButton("MS");

bOther.addActionListener(this);

bOther.setForeground(Color.red);

bOther.setMargin(newInsets(3,2,3,2));

pLeft.add(bOther);

bOther=newJButton("M+");

bOther.addActionListener(this);

bOther.setForeground(Color.red);

bOther.setMargin(newInsets(3,2,3,2));

pLeft.add(bOther);

pBottom.add(pLeft,BorderLayout.WEST);

JPanelpRight=newJPanel();

pRight.setLayout(newBorderLayout());

JPanelpUp=newJPanel();

pUp.setLayout(newGridLayout(1,3,3,0));

bOther=newJButton("BackSpace");

bOther.addActionListener(this);

bOther.setForeground(Color.red);

bOther.setMargin(newInsets(3,0,3,5));

pUp.add(bOther);

bOther=newJButton("CE");

bOther.addActionListener(this);

bOther.setForeground(Color.red);

pUp.add(bOther);

bOther=newJButton("C");

bOther.addActionListener(this);

bOther.setForeground(Color.red);

pUp.add(bOther);

/***************************Java计算器数字键盘区定义**************************/

JPanelpDown=newJPanel();

pDown.setLayout(newGridLayout(4,5,3,2));

bNumber=newJButton("7");

bNumber.setForeground(Color.blue);

bNumber.addActionListener(this);

bNumber.setMargin(newInsets(3,3,3,3));

pDown.add(bNumber);

bNumber=newJButton("8");

bNumber.setForeground(Color.blue);

bNumber.addActionListener(this);

bNumber.setMargin(newInsets(3,3,3,3));

pDown.add(bNumber);

bNumber=newJButton("9");

bNumber.setForeground(Color.blue);

bNumber.addActionListener(this);

bNumber.setMargin(newInsets(3,3,3,3));

pDown.add(bNumber);

bOperator=newJButton("/");

bOperator.setForeground(Color.red);

bOperator.addActionListener(this);

bOperator.setMargin(newInsets(3,0,3,0));

pDown.add(bOperator);

bOperator=newJButton("sqrt");

bOperator.addActionListener(this);

bOperator.setForeground(Color.red);

bOperator.setMargin(newInsets(3,0,3,0));

pDown.add(bOperator);

bNumber=newJButton("4");

bNumber.setForeground(Color.blue);

bNumber.addActionListener(this);

bNumber.setMargin(newInsets(3,3,3,3));

bNumber.setHorizontalTextPosition(JButton.LEFT);

pDown.add(bNumber);

bNumber=newJButton("5");

bNumber.setForeground(Color.blue);

bNumber.addActionListener(this);

bNumber.setMargin(newInsets(3,3,3,3));

pDown.add(bNumber);

bNumber=newJButton("6");

bNumber.setForeground(Color.blue);

bNumber.addActionListener(this);

bNumber.setMargin(newInsets(3,3,3,3));

pDown.add(bNumber);

bOperator=newJButton("*");

bOperator.setForeground(Color.red);

bOperator.addActionListener(this);

bOperator.setMargin(newInsets(3,3,3,3));

pDown.add(bOperator);

bOperator=newJButton("%");

bOperator.setForeground(Color.blue);

bOperator.addActionListener(this);

bOperator.setMargin(newInsets(3,3,3,3));

pDown.add(bOperator);

bNumber=newJButton("1");

bNumber.setForeground(Color.blue);

bNumber.addActionListener(this);

bNumber.setMargin(newInsets(3,3,3,3));

pDown.add(bNumber);

bNumber=newJButton("2");

bNumber.setForeground(Color.blue);

bNumber.addActionListener(this);

bNumber.setMargin(newInsets(3,3,3,3));

pDown.add(bNumber);

bNumber=newJButton("3");

bNumber.setForeground(Color.blue);

bNumber.addActionListener(this);

bNumber.setMargin(newInsets(3,3,3,3));

pDown.add(bNumber);

bOperator=newJButton("-");

bOperator.setForeground(Color.red);

bOperator.addActionListener(this);

bOperator.setMargin(newInsets(3,3,3,3));

pDown.add(bOperator);

bOperator=newJButton("1/x");

bOperator.setForeground(Color.blue);

bOperator.addActionListener(this);

pDown.add(bOperator);

bNumber=newJButton("0");

bNumber.setForeground(Color.blue);

bNumber.addActionListener(this);

bNumber.setMargin(newInsets(3,3,3,3));

pDown.add(bNumber);

bOperator=newJButton("+/-");

bOperator.setForeground(Color.blue);

bOperator.addActionListener(this);

bOperator.setMargin(newInsets(3,3,3,3));

pDown.add(bOperator);

bOperator=newJButton(".");

bOperator.setForeground(Color.blue);

bOperator.addActionListener(this);

bOperator.setMargin(newInsets(3,3,3,3));

pDown.add(bOperator);

bOperator=newJButton("+");

bOperator.setForeground(Color.blue);

bOperator.addActionListener(this);

bOperator.setMargin(newInsets(3,3,3,3));

pDown.add(bOperator);

bOperator=newJButton("=");

bOperator.setForeground(Color.blue);

bOperator.addActionListener(this);

bOperator.setMargin(newInsets(3,3,3,3));

pDown.add(bOperator);

pRight.add(pUp,BorderLayout.NORTH);

pRight.add(pDown,BorderLayout.SOUTH);

pBottom.add(pRight,BorderLayout.EAST);

contentPane.add(pBottom,BorderLayout.SOUTH);

f.setSize(newDimension(320,256));

f.setResizable(false);

f.setVisible(true);

f.addWindowListener(newWindowAdapter()

{

publicvoidwindowClosing(WindowEvente)

{

System.exit(0);

}

}

);

}

/************************Java计算器计算方法区***************************/

publicvoidactionPerformed(ActionEvente)

{

Strings=e.getActionCommand();

if(s.equals("复制(C)"))

{

Stringtemp=tResult.getText().trim();

Board.replace(0,Board.length(),temp);

mPaste.setEnabled(true);

}

elseif(s.equals("粘贴(p)"))

{

tResult.setText(Board.toString());

}

elseif(s.equals("CE"))

{

//如果是CE则清除文本框

tResult.setText("0.");

}

elseif(s.equals("BackSpace"))

{

if(!tResult.getText().trim().equals("0."))

{

//如果文本框中有内容

if(str.length()!=1&&str.length()!=0)

{

tResult.setText(str.delete(str.length()-1,str.length()).toString());

}

else

{

tResult.setText("0.");

str.setLength(0);

}

}

op2=Double.parseDouble(tResult.getText().trim());

}

elseif(s.equals("C"))

{

//如果是C删除当前计算

tResult.setText("0.");

op1=op2=0;

str.replace(0,str.length(),"");

preOp=currentOp=0;

}

elseif(s.equals("MC"))

{

//如果是MC则清除缓冲区

Stringtemp="";

memory.replace(0,memory.length(),temp);

bM.setText("");

}

elseif(s.equals("MR"))

{

//如果按键为MR则恢复缓冲区的数到文本框

tResult.setText(memory.toString());

}

elseif(s.equals("MS"))

{

//如果按键为MS则将文本框的数存入缓冲区

Strings1=tResult.getText().trim();

memory.replace(0,memory.length(),s1);

bM.setText("M");

}

elseif(s.equals("M+"))

{

//如果按键为MS则将文本框值与缓冲区的数相加但不显示结果

Stringtemp1=tResult.getText().trim();

doubledtemp=Double.parseDouble(temp1);

Stringtemp2=memory.toString();

dtemp+=Double.parseDouble(temp2);

temp1=String.valueOf(dtemp);

memory.replace(0,memory.length(),temp1);

}

elseif(s.equals("1/x"))

{

//如果按键为1/x则将文本框中的数据为它的倒数

Stringtemp=tResult.getText().trim();

doubledtemp=Double.parseDouble(temp);

tResult.setText(""+1/dtemp);

}

elseif(s.equals("sqrt"))

{

//如果按键为sqrt则将文本框中的内容求平方根

Stringtemp=tResult.getText().trim();

doubledtemp=Double.parseDouble(temp);

tResult.setText(""+Math.sqrt(dtemp));

}

elseif(s.equals("+"))

{

str.setLength(0);

if(currentOp==0)

{

preOp=currentOp=1;

op2=0;

tResult.setText(""+op1);

}

else

{

currentOp=preOp;

preOp=1;

switch(currentOp){

case1:

op1+=op2;

tResult.setText(""+op1);

break;

case2:

op1-=op2;

tResult.setText(""+op1);

break;

case3:

op1*=op2;

tResult.setText(""+op1);

break;

case4:

op1/=op2;

tResult.setText(""+op1);

break;

}

}

}

elseif(s.equals("-")){

str.setLength(0);

if(currentOp==0)

{

preOp=currentOp=2;//op1=op2;op2=0;

tResult.setText(""+op1);

}

else

{

currentOp=preOp;

preOp=2;

switch(currentOp){

case1:op1=op1+op2;tResult.setText(""+op1);break;

case2:op1=op1-op2;tResult.setText(""+op1);break;

case3:op1=op1*op2;tResult.setText(""+op1);break;

case4:op1=op1/op2;tResult.setText(""+op1);break;

}

}

}

elseif(s.equals("*"))//*

{

str.setLength(0);

if(currentOp==0)

{

preOp=currentOp=3;//op1=op2;op2=1;

tResult.setText(""+op1);//op1=op2;

}

else

{

currentOp=preOp;

preOp=3;

switch(currentOp){

case1:op1=op1+op2;tResult.setText(""+op1);break;

case2:op1=op1-op2;tResult.setText(""+op1);break;

case3:op1=op1*op2;tResult.setText(""+op1);break;

case4:op1=op1/op2;tResult.setText(""+op1);break;

}

}

}

elseif(s.equals("/"))///

{

str.setLength(0);

if(currentOp==0)

{

preOp=currentOp=4;//op2=1;

tResult.setText(""+op1);//op1=op2;

}

else

{

currentOp=preOp;

preOp=4;

switch(currentOp){

case1:op1=op1+op2;tResult.setText(""+op1);break;

case2:op1=op1-op2;tResult.setText(""+op1);break;

case3:op1=op1*op2;tResult.setText(""+op1);break;

case4:op1=op1/op2;tResult.setText(""+op1);break;

}

}

}

elseif(s.equals("="))//=

{

if(currentOp==0)

{

str.setLength(0);

tResult.setText(""+op2);

}

else

{

str.setLength(0);

currentOp=preOp;

switch(currentOp){

case1:op1=op1+op2;tResult.setText(""+op1);break;

case2:op1=op1-op2;tResult.setText(""+op1);break;

case3:op1=op1*op2;tResult.setText("&qu

❼ 如何用JAVA语言编写计算器小程序

具体代码如下：

import javax.swing.*;

import java.awt.event.*;

import java.awt.*;

public class Calculator extends JFrame implements ActionListener {

private JFrame jf;

private JButton[] allButtons;

private JButton clearButton;

private JTextField jtf;

public Calculator() {

//对图形组件实例化

jf=new JFrame("任静的计算器1.0：JAVA版");

jf.addWindowListener(new WindowAdapter(){

public void windowClosing(){

System.exit(0);

}

});

allButtons=new JButton[16];

clearButton=new JButton("清除");

jtf=new JTextField(25);

jtf.setEditable(false);

String str="123+456-789*0.=/";

for(int i=0;i<allButtons.length;i++){

allButtons[i]=new JButton(str.substring(i,i+1));

}

}

public void init(){

//完成布局

jf.setLayout(new BorderLayout());

JPanel northPanel=new JPanel();

JPanel centerPanel=new JPanel();

JPanel southPanel=new JPanel();

northPanel.setLayout(new FlowLayout());

centerPanel.setLayout(new GridLayout(4,4));

southPanel.setLayout(new FlowLayout());

northPanel.add(jtf);

for(int i=0;i<16;i++){

centerPanel.add(allButtons[i]);

}

southPanel.add(clearButton);

jf.add(northPanel,BorderLayout.NORTH);

jf.add(centerPanel,BorderLayout.CENTER);

jf.add(southPanel,BorderLayout.SOUTH);

addEventHandler();

}

//添加事件监听

public void addEventHandler(){

jtf.addActionListener(this);

for(int i=0;i<allButtons.length;i++){

allButtons[i].addActionListener(this);

}

clearButton.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

Calculator.this.jtf.setText("");

}

});

}

//事件处理

public void actionPerformed(ActionEvent e) {

//在这里完成事件处理 使计算器可以运行

String action=e.getActionCommand();

if(action=="+"||action=="-"||action=="*"||action=="/"){

}

}

public void setFontAndColor(){

Font f=new Font("宋体",Font.BOLD,24);

jtf.setFont(f);

jtf.setBackground(new Color(0x8f,0xa0,0xfb));

for(int i=0;i<16;i++){

allButtons[i].setFont(f);

allButtons[i].setForeground(Color.RED);

}

}

public void showMe(){

init();

setFontAndColor();

jf.pack();

jf.setVisible(true);

jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public static void main(String[] args){

new Calculator().showMe();

}

}

❽ 用java程序编写一个计算器

给你一个参考，希望不要被网络吞了当晚餐
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.text.DecimalFormat;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Calculator {
//计算器面板
private JFrame f = new JFrame("Calculator");
//输入面扳
private JPanel inputPanel = new JPanel();
//加减乘除面板
private JPanel operationPanel = new JPanel();
//数字面板
private JPanel buttonsPanel = new JPanel();

//输入数据文本框
private JTextField input = new JTextField(20);

//退格键
private JButton backspace = new JButton("BackSpace");
//清空
private JButton CE = new JButton("CE ");
//删除
private JButton C = new JButton("C ");

//四则运算符号键
private JButton add = new JButton("+");
private JButton sub = new JButton("-");
private JButton mul = new JButton("*");
private JButton div = new JButton("/");

//小数点
private JButton decimal = new JButton(".");
//等号
private JButton equal = new JButton("=");

//数字键
private JButton zero = new JButton("0");
private JButton one = new JButton("1");
private JButton two = new JButton("2");
private JButton three = new JButton("3");
private JButton four = new JButton("4");
private JButton five = new JButton("5");
private JButton six = new JButton("6");
private JButton seven = new JButton("7");
private JButton eight = new JButton("8");
private JButton nine = new JButton("9");

private String num1 = "";//保存第一个运算数字
private String operator = "";//保存运算符号

public static void main(String[] args) {
new Calculator();//new计算器实例
}

public Calculator(){
//添加组件，布局
inputPanel.add(input);
f.add(inputPanel, BorderLayout.NORTH);

operationPanel.add(backspace);
operationPanel.add(CE);
operationPanel.add(C);
f.add(operationPanel, BorderLayout.CENTER);

buttonsPanel.add(add);
buttonsPanel.add(sub);
buttonsPanel.add(mul);
buttonsPanel.add(div);
buttonsPanel.add(one);
buttonsPanel.add(two);
buttonsPanel.add(three);
buttonsPanel.add(zero);
buttonsPanel.add(four);
buttonsPanel.add(five);
buttonsPanel.add(six);
buttonsPanel.add(decimal);
buttonsPanel.add(seven);
buttonsPanel.add(eight);
buttonsPanel.add(nine);
buttonsPanel.add(equal);
buttonsPanel.setLayout(new GridLayout(4, 4));
f.add(buttonsPanel, BorderLayout.SOUTH);

//注册各个组件监听事件
backspace.addMouseListener(new OperationMouseListener());
CE.addMouseListener(new OperationMouseListener());
C.addMouseListener(new OperationMouseListener());
decimal.addMouseListener(new OperationMouseListener());
equal.addMouseListener(new OperationMouseListener());

//注册四则运算监听
add.addMouseListener(new CalcMouseListener());
sub.addMouseListener(new CalcMouseListener());
mul.addMouseListener(new CalcMouseListener());
div.addMouseListener(new CalcMouseListener());

//注册数字监听事件
zero.addMouseListener(new NumberMouseListener());
one.addMouseListener(new NumberMouseListener());
two.addMouseListener(new NumberMouseListener());
three.addMouseListener(new NumberMouseListener());
four.addMouseListener(new NumberMouseListener());
five.addMouseListener(new NumberMouseListener());
six.addMouseListener(new NumberMouseListener());
seven.addMouseListener(new NumberMouseListener());
eight.addMouseListener(new NumberMouseListener());
nine.addMouseListener(new NumberMouseListener());

f.setVisible(true);
f.pack();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

private class NumberMouseListener implements MouseListener{

public void mouseClicked(MouseEvent e) {
if(input.getText().trim().equals("0")){//如果文本框已经是0，结果还是0
input.setText(((JButton)e.getSource()).getText().trim());
}else{//否则的话，把0添加到后面，譬如文本框是1，结果就为10
input.setText(input.getText().concat(((JButton)e.getSource()).getText().trim()));
}
}

public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mousePressed(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
}

private class CalcMouseListener implements MouseListener{
//如果输入的是运算符号，保存第一个结果和运算符号
public void mouseClicked(MouseEvent e) {
num1 = input.getText().trim();input.setText("");
operator = ((JButton)e.getSource()).getText().trim();
}

public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mousePressed(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
}

private class OperationMouseListener implements MouseListener{

public void mouseClicked(MouseEvent e) {
if(e.getSource() == backspace){//退格键，删除一个直到没有字符删除
String inputText = input.getText();
if(inputText.length() > 0){
input.setText(inputText.substring(0, inputText.length() - 1));
}
}else if(e.getSource() == C){
input.setText("0");//C，清空所有运算数字和符号
num1 = "";
}else if(e.getSource() == CE){
input.setText("0");//CE-->将文本框置为0
}else if(e.getSource() == decimal){
String text = input.getText().trim();
//如果按了小数点，如果文本框已经有小数点，不做任何操作，否则在结果后面加上小数点
if(text.indexOf(".") == -1){
input.setText(text.concat("."));
}
}else if(e.getSource() == equal){
//如果是等号
if(!operator.trim().equals("")){
if(!input.getText().trim().equals("")){
double result = 0D;
if(operator.equals("+")){//执行加法运算
result = Double.parseDouble(num1) + Double.parseDouble(input.getText().trim());
}else if(operator.equals("-")){//减法运算
result = Double.parseDouble(num1) - Double.parseDouble(input.getText().trim());
}else if(operator.equals("*")){//乘法运算
result = Double.parseDouble(num1) * Double.parseDouble(input.getText().trim());
}else if(operator.equals("/")){//除法运算
result = Double.parseDouble(num1) / Double.parseDouble(input.getText().trim());
}

//格式化最终结果，保留两位小数点
input.setText(new DecimalFormat("0.00").format(result));
}
}

}

}

public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mousePressed(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
}

}

❾ java：编写一个计算器小程序，要求可以做加减乘除运算

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Calculator extends JFrame implements ActionListener{
private static final long serialVersionUID = 8199443193151152362L;
private JButton bto_s=new JButton("sqrt"),bto_zf=new JButton("+/-"),bto_ce=new JButton("CE"),bto_c=new JButton("C"),bto_7=new JButton("7"),
bto_8=new JButton("8"),bto_9=new JButton("9"),bto_chu=new JButton("/"),bto_4=new JButton("4"),bto_5=new JButton("5"),
bto_6=new JButton("6"),bto_cheng=new JButton("*"),bto_1=new JButton("1"),bto_2=new JButton("2"),bto_3=new JButton("3"),
bto_jian=new JButton("-"),bto_0=new JButton("0"),bto_dian=new JButton("."),bto_deng=new JButton("="),bto_jia=new JButton("+");
JButton button[]={bto_s,bto_zf,bto_ce,bto_c,bto_7,bto_8,bto_9,bto_chu,bto_4,bto_5,bto_6,bto_cheng,bto_1,bto_2,bto_3,bto_jian,
bto_0,bto_dian,bto_deng,bto_jia};
private JTextField text_double;// = new JTextField("0");
private String operator = "="; //当前运算的运算符
private boolean firstDigit = true; // 标志用户按的是否是整个表达式的第一个数字,或者是运算符后的第一个数字
private double resultNum = 0.0; // 计算的中间结果
private boolean operateValidFlag = true; //判断操作是否合法
public Calculator()
{
super("Calculator");
this.setBounds(300, 300, 300, 300);
this.setResizable(false);
this.setBackground(Color.orange);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.getContentPane().setLayout(new BorderLayout());//设置布局
text_double=new JTextField("0",20);//设置文本区
text_double.setHorizontalAlignment(JTextField.RIGHT);//设置水平对齐方式未右对齐
this.getContentPane().add(text_double,BorderLayout.NORTH);//将文本区添加到Content北部
JPanel panel=new JPanel(new GridLayout(5,4));//在内容窗口添加一个网格布局
this.getContentPane().add(panel);//添加panel面板
for(int i=0;i<button.length;i++)//在面板上添加按钮
panel.add(button[i]);

for(int i=0;i<button.length;i++)
button[i].addActionListener(this);//为按钮注册
text_double.setEditable(false);//文本框不可编辑
text_double.addActionListener(this);//

this.setVisible(true);
}
public void actionPerformed(ActionEvent e)//
{
String c= e.getActionCommand();//返回与此动作相关的命令字符串。
System.out.println("##########command is "+c);
if(c.equals("C")){
handleC(); //用户按了“C”键
}
else if (c.equals("CE")) // 用户按了"CE"键
{
text_double.setText("0");
}
else if ("0123456789.".indexOf(c) >= 0) // 用户按了数字键或者小数点键
{
handleNumber(c); // handlezero(zero);
} else //用户按了运算符键
{
handleOperator(c);
}
}
private void handleC() // 初始化计算器的各种值
{
text_double.setText("0");
firstDigit = true;
operator = "=";
}
private void handleNumber(String button) {
if (firstDigit)//输入的第一个数字
{
text_double.setText(button);
} else if ((button.equals(".")) && (text_double.getText().indexOf(".") < 0))//输入的是小数点，并且之前没有小数点，则将小数点附在结果文本框的后面
//如果字符串参数作为一个子字符串在此对象中出现，则返回第一个这种子字符串的第一个字符的索引；如果它不作为一个子字符串出现，则返回 -1
{
text_double.setText(text_double.getText() + ".");
} else if (!button.equals("."))// 如果输入的不是小数点，则将数字附在结果文本框的后面
{
text_double.setText(text_double.getText() + button);
}
// 以后输入的肯定不是第一个数字了
firstDigit = false;
}
private void handleOperator(String button) {

if (operator.equals("/")) {
// 除法运算
// 如果当前结果文本框中的值等于0
if (getNumberFromText() == 0.0){
// 操作不合法
operateValidFlag = false;
text_double.setText("除数不能为零");
} else {
resultNum /= getNumberFromText();
}
} else if (operator.equals("+")){
// 加法运算
resultNum += getNumberFromText();
} else if (operator.equals("-")){
// 减法运算
resultNum -= getNumberFromText();
} else if (operator.equals("*")){
// 乘法运算
resultNum *= getNumberFromText();
} else if (operator.equals("sqrt")) {
// 平方根运算
if(getNumberFromText()<0){
operateValidFlag = false;
text_double.setText("被开方数不能为负数");}
else
resultNum = Math.sqrt(resultNum);
}
else if (operator.equals("+/-")){
// 正数负数运算
resultNum = resultNum * (-1);
} else if (operator.equals("=")){
// 赋值运算
resultNum = getNumberFromText();
}
if (operateValidFlag) {
// 双精度浮点数的运算
long t1;
double t2;
t1 = (long) resultNum;
t2 = resultNum - t1;
if (t2 == 0) {
text_double.setText(String.valueOf(t1));
} else {
text_double.setText(String.valueOf(resultNum));
}
}
operator = button; //运算符等于用户按的按钮
firstDigit = true;
operateValidFlag = true;
}
private double getNumberFromText() //从结果的文本框获取数字
{
double result = 0;
try {
result = Double.valueOf(text_double.getText()).doubleValue(); // ValueOf()返回表示指定的 double 值的 Double 实例
} catch (NumberFormatException e){
}
return result;
}
public static void main(final String[] args) {
new Calculator();
}
}

❿ java编写一个小型计算器应用程序

package 计算器;
import java.awt.*;
import java.awt.event.*;

public class computer implements WindowListener,ActionListener{

private Frame f;
double d0,d1,d2,result;
boolean flag=true;
String s,oper;
TextField tf1;
Panel p=new Panel();

public static void main(String args[])
{ computer e=new computer();
e.go();
}

public void go(){
int i;
result=0;
s=new String();
oper=new String("+");
f=new Frame("计算器");
MenuBar mb=new MenuBar();
f.setMenuBar(mb);
Menu m1=new Menu("编辑");
Menu m2=new Menu("帮助");
Menu m3=new Menu("关于");
mb.add(m1);
mb.add(m3);
mb.setHelpMenu(m2);
tf1=new TextField("",15);
Button[] b=new Button[21];
for(i=1;i<21;i++)
{
b[i]=new Button();
b[i].setFont(new Font("仿宋",0,16));
}
b[1].setLabel("退格");
b[2].setLabel("CE");
b[3].setLabel("C");
b[4].setLabel("/");
b[5].setLabel("7");
b[6].setLabel("8");
b[7].setLabel("9");
b[8].setLabel("*");
b[9].setLabel("4");
b[10].setLabel("5");
b[11].setLabel("6");
b[12].setLabel("-");
b[13].setLabel("1");
b[14].setLabel("2");
b[15].setLabel("3");
b[16].setLabel("+");
b[17].setLabel("0");
b[18].setLabel("+/-");
b[19].setLabel(".");
b[20].setLabel("=");
p.setLayout(new GridLayout(5,4));
p.setBackground(new Color(80,30,100));
for(i=1;i<21;i++)
{ p.add(b[i]);
b[i].addActionListener(this);
b[i].setBackground(new Color(20,130,180));
b[i].setForeground(Color.yellow);
}
for(i=1;i<4;i++)
{
b[i].setBackground(new Color(120,180,170));
b[i].setForeground(Color.blue);
}
for(i=1;i<=4;i++)
{ b[i*4].setBackground(new Color(120,180,170));
b[i*4].setForeground(Color.red);
}
b[20].setBackground(Color.red);
f.addWindowListener(this);
f.setLayout(new BorderLayout());
f.add("North",tf1);
f.add("Center",p);
f.setSize(200,200);
f.setVisible(true);
}

public void windowClosing(WindowEvent e){System.exit(1);}
public void windowOpened(WindowEvent e){}
public void windowIconified(WindowEvent e){}
public void windowDeiconified(WindowEvent e){}
public void windowClosed(WindowEvent e){}
public void windowActivated(WindowEvent e){}
public void windowDeactivated(WindowEvent e){}

public void actionPerformed(ActionEvent e){
String i1=tf1.getText();
s=e.getActionCommand();
if(s=="0"| s=="1"|s=="2"|s=="3"|s=="4"|s=="5"|s=="6"|s=="7"|s=="8"|s=="9"|s==".")
{ if(flag) tf1.setText(i1+s);
else
{ tf1.setText(s);
flag=true;
}
}
else if(s=="+"|s=="-"|s=="*"|s=="/")
{ result=Double.parseDouble(i1);
flag=false;
oper=s;
}
else if(s=="=")
{ d0=Double.parseDouble(i1);
if(oper=="+") result+=d0;
if(oper=="-") result-=d0;
if(oper=="*") result*=d0;
if(oper=="/") result/=d0;
tf1.setText(Double.toString(result));
flag=false;
}
else if(s=="CE")
{ tf1.setText("");
flag=false;
}
else if(s=="C")
{ result=0;
tf1.setText("");
flag=false;
}
else if(s=="退格")
{ String ss=tf1.getText();
int i=ss.length();
ss=ss.substring(0,i-1);
tf1.setText(ss);
}
else if(s=="+/-")
{ d2=-1*Double.parseDouble(tf1.getText());
tf1.setText(Double.toString(d2));
}
}
}

绝对能运行