java回文素数

㈠ java实现1000以内回文素数（质数）

publicclass${

publicstaticvoidmain(String[]args){

for(inti=1;i<=1000;i++){

if(!check(i)){
continue;
}

if(huiweishu(i)){
System.out.println(i);
}
}
}

privatestaticbooleancheck(intnum){

intsqrt=(int)Math.sqrt(num);
for(intj=2;j<sqrt+1;j++){

if(num%j==0){
returnfalse;
}
}
returntrue;
}

privatestaticbooleanhuiweishu(inti){

inta;
if(i<99){
a=i/10;
}else{
a=i/100;
}
returna==i%10;
}
}

11
101
131
151
181
191
313
353
373
383
727
757
787
797
919
929

㈡ 鍙岖礌鏁帮纸阃嗗悜𨰾煎啓镄勭礌鏁帮级缂栧啓java绋嫔簭

public class TempCls
{
public static boolean isPrime(long n)
{ //鍒ゆ柇绱犳暟
int i = 2;
while (i*i <= n)
{
if (n % i ==0)
return false;
i++;
}
return true;
}

public static String reverseStr(String str)
{ //鍙嶈浆瀛楃︿覆
String result = "";
for (int i = str.length()-1; i >= 0; i--)
{
result += str.charAt(i);
}
return result;
}

public static boolean reverseJudge(long n)
{ //鍙嶈浆鏁板瓧鍒ゆ柇
String nStr = reverseStr(n + "");
return isPrime(Integer.parseInt(nStr));
}

public static boolean isPalindromic(long n)
{ //锲炴枃鍒ゆ柇
String str1 = n + "";
String str2 = reverseStr(str1);
return !str1.equals(str2);
}

public static void main(String[] args)
{
int n = 0; //璁℃暟鍣
int i = 2; //1涓嶆槸绱犳暟锛屾晠浠2寮濮
while (n < 100)
{
if (isPalindromic(i) && isPrime(i) && reverseJudge(i))
{
System.out.print(i + "\t\t");
n++;
if (n % 10 == 0)
System.out.println();
}
i++;
}
}
}

㈢ 锲炴枃绱犳暟鏄浠涔

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链杩戝彂鐜扮殑链澶х殑鍗佷釜锲炴枃绱犳暟:
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