java获取随机密码

import java.util.Random;

public class tests {

    /**
     *
     * author LiuQiang
     * date 2013-10-14 下午01:13:54
     * @param args
     */
    public static void main(String[] args) {
        char[] ss = new char[10];
         int[] flag = {0,0,0}; //A-Z, a-z, 0-9
         int i=0;
        while(flag[0]==0 || flag[1]==0 || flag[2]==0 || i<10) {
            i = i%10;
            int f = (int) (Math.random()*3%3);
            if(f==0)
                ss[i] = (char) ('A'+Math.random()*26);
            else if(f==1)
                ss[i] = (char) ('a'+Math.random()*26);
            else
                ss[i] = (char) ('0'+Math.random()*10);
            flag[f]=1;
            i++;
         }
        Random rd = new Random();
        char[] a = {'@','#','$','%','&','*'};
        int max = ss.length;
        int min = 1;
        for(int n=0;n<2;n++){
            int indexa = rd.nextInt(5);
            int indexss = rd.nextInt(max)%(max-min+1) + min;
            ss[indexss]=a[indexa];
        }

        System.out.println(new String(ss));
    }
}