java多線程筆試編程題

㈠ java多線程練習題

public class Thread11 {
public static void main(String[] args) {
GThread g = new GThread("烏龜");
ZThread z = new ZThread("兔子");
g.start();
z.start();
}
}

class GThread extends Thread{//烏龜
private String name;
public GThread(String name) {
this.name = name;
}
public void run() {
for (int i = 0; i < 1000; ) {
try {
sleep(100);//1000
i++;
System.out.println(name + "跑了" + i + "米了");
if(i%100==0){
sleep(500);
System.out.println(name + "休息了500ms");
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}

}
class ZThread extends Thread{//兔子
private String name;
public ZThread(String name) {
this.name = name;
}
public void run() {
for (int i = 0; i < 1000; ) {
try {
sleep(100);//1000
i+=5;
System.out.println(name + "跑了" + i + "米了");
if(i%20==0){
sleep(500);
System.out.println(name + "休息了500ms");
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}

}

㈡ 【在線】高分求助JAVA多線程編程題 （極為簡單的多線程顯示字元）

你確定B是3毫秒？

class Test
{
public static void main (String[] args) {
new A('A',500).start();
new A('B',3).start();
}
}
class A extends Thread
{
char c;
int i;
A(char c,int i){
this.c=c;
this.i=i;
}
public void run()
{
for(;;)
{
try{
sleep(i);
}
catch(Exception e){}
System.out.println (c);
}
}
}

㈢ 用JAVA寫一個多線程程序，如寫四個線程，二個對一個變數減一，輸出。

public class ThreadTest1{
private int j;
public static void main(String args[]){
ThreadTest1 tt=new ThreadTest1();
Inc inc=tt.new Inc();
Dec dec=tt.new Dec();
for(int i=0;i<2;i++){
Thread t=new Thread(inc);
t.start();
t=new Thread(dec);
t.start();
}
}
private synchronized void inc(){
j++;
System.out.println(Thread.currentThread().getName()+"-inc:"+j);
}
private synchronized void dec(){
j--;
System.out.println(Thread.currentThread().getName()+"-dec:"+j);
}
class Inc implements Runnable{
public void run(){
for(int i=0;i<100;i++){
inc();
}
}
}
class Dec implements Runnable{
public void run(){
for(int i=0;i<100;i++){
dec();
}
}
}
}

㈣ 遇到一個筆試題，關於java 多線程的，請牛人多指點，小弟菜鳥一個~~

我的做法就是，把int改為Integer，然後每個方法加上synchronized，但是，你說的線程，是怎麼回事？把C繼承Thread，是Runnable，實現run（）方法？

㈤ JAVA多線程 編程題兩個案例，不會寫，求大神寫出代碼，萬分感謝，多線程還沒學。

/*
class A extends Thread
{
public void run()
{
try
{
Thread.sleep(1000);
}catch(Exception e)
{
System.out.println("A ERROR!");
}
System.out.println("AAAA");
}
}

class B extends Thread
{
public void run()
{
try
{
Thread.sleep(2000);
}catch(Exception e)
{
System.out.println("B ERROR!");
}
System.out.println("BBBB");
}
}

class C extends Thread
{
public void run()
{
try
{
Thread.sleep(3000);
}catch(Exception e)
{
System.out.println("C ERROR!");
}
System.out.println("CCCC");
}
}

public class Test_1
{
public static void main(String[] args)
{
A a = new A();
B b = new B();
C c = new C();

a.start();
b.start();
c.start();
}
}*/

public class Test_1
{
public static void main(String[] args)
{
A a = new A();
B b = new B();
C c = new C();
Thread ta = new Thread(a);
Thread tb = new Thread(b);
Thread tc = new Thread(c);

ta.start();
tb.start();
tc.start();
}
}

class A implements Runnable
{
public void run()
{
try
{
Thread.sleep(1000);
}catch(Exception e)
{
System.out.println("A ERROR!");
}
System.out.println("AAAA");
}
}

class B implements Runnable
{
public void run()
{
try
{
Thread.sleep(2000);
}catch(Exception e)
{
System.out.println("B ERROR!");
}
System.out.println("BBBB");
}
}

class C implements Runnable
{
public void run()
{
try
{
Thread.sleep(3000);
}catch(Exception e)
{
System.out.println("C ERROR!");
}
System.out.println("CCCC");
}
}
案例一的兩種方法已經寫好；現在有事，晚上再把案例二代碼寫一下，應該沒關系吧！
抱歉，是一個線程類，我看錯了，晚上重發一下代碼！

㈥ 一道java多線程試題

B, 答案錯了，哪個老師出的題？BS TA。
兩種方式，實現介面為Rnnable，繼承父類為Thread