开发验证码

目的：开发验证码

要求：验证码要包含字母和数字

详细代码如下：

import java.util.Random;
public class Practice10 {
    public static void main(String[] args) {
        char[] chs = new char[52];
        for (int i = 0; i < chs.length; i++) {
            if (i <= 25) {
                chs[i] = (char)(97 + i);
            }else {
                chs[i] = (char)(65 + i - 26);
            }
        }
        String result = "";
        Random r = new Random();
        for (int i = 0; i < 4; i++) {
            int randomIndex = r.nextInt(chs.length);
            result = result + chs[randomIndex];
        }
        int number = r.nextInt(10);
        result = result + number;
        System.out.println(result);
    }
}

 代码运行结果如下：

D:\javakaifagongjubao\jdk\jdk-17\bin\java.exe -javaagent:D:\javakaifagongjubao\idea\lib\idea_rt.jar=51161:D:\javakaifagongjubao\idea\bin -Dfile.encoding=UTF-8 -classpath D:\javakaifagongjubao\chengxu\untitled\out\production\ch02;D:\javakaifagongjubao\jsoup-1.15.3.jar Practice10

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