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package wanzai;
import java.util.*;
public class Suijishu {
public static void main(String[] args) {
String str="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
Random ran=new Random();
for(int i=0;i<4;i++)
{
int j=ran.nextInt(str.length()-1);
String s=str.substring(j, j+1);
System.out.print(s);
}
}
}
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原文地址:http://www.cnblogs.com/jiang2538406936/p/5267943.html