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Java生成随机验证码

菜菜捞捞 2022-04-13 阅读 131
java
import java.util.Random;
import java.util.Scanner;

public class Test {
    public static void main(String[] args) {
        System.out.println("需要几位验证码:");
        Scanner s = new Scanner(System.in);
        int n = s.nextInt();
        String yz=creat(n);
        System.out.println(yz);
    }

    public static String creat(int x) {
        String code = "";
        Random rd = new Random();
        for (int i = 0; i < x; i++) {
            int type = rd.nextInt(3);
            switch (type) {
                case 0:
                    char ch = (char) (rd.nextInt(26) + 65);
                    code += ch;
                    break;
                case 1:
                    char ch1 = (char) (rd.nextInt(26) + 97);
                    code += ch1;
                    break;
                case 2:
                    code += rd.nextInt(10);
                    break;
            }
        }
        return code;
    }
}
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