不轻言放弃

 利用JAVA 产生随机数的方法如下：

package com.mzzo;

public class TestRamon4 {

public static String getSixBitRan() {

java.util.Random ran = new java.util.Random();

String ranNum = String.valueOf(Math.abs(ran.nextInt()));

while (ranNum.length() != 4) {

if (ranNum.length() > 4)

ranNum = ranNum.substring(0, ranNum.length() - 1);

else

ranNum = ranNum + "0";

}

return ranNum;

}

public static void main(String[] args) {

System.out.println(TestRamon4.getSixBitRan());

}

}