生成有数字和字母生成的不重复的验证码

import java.util.Random;

//生成有数字和字母生成的不重复的验证码 public class GenerantRandom { private static final char[] str = {‘0’,’1’,’2’,’3’,’4’,’5’,’6’,’7’,’8’,’9’,’A’,’B’, ‘C’,’D’,’E’,’F’,’G’,’H’,’I’,’J’,’K’,’L’,’M’,’N’, ‘O’,’P’,’Q’,’R’,’S’,’T’,’U’,’V’,’W’,’X’,’Y’,’Z’};

public static void main(String[] args) {

    String validate = "";

    while(true) {
        char c = str[new Random().nextInt(36)];
        if(!validate.contains(c+"")) {
            validate += c;
        }
        if(validate.length()==6) {
            break;
        }
    }
    System.out.println(validate);
}

}