Java/com/study/demo12/TestVerifyCodeLogic.java

package com.study.demo12;

public class TestVerifyCodeLogic {
    public static void main(String[] args) {
        String timestamp = String.valueOf(System.currentTimeMillis());
        String last4Digits = timestamp.substring(timestamp.length() - 4);
        String code = "CODE" + last4Digits;

        System.out.println("完整时间戳: " + timestamp);
        System.out.println("时间戳后4位: " + last4Digits);
        System.out.println("生成的验证码: " + code);
        System.out.println("验证码格式正确: " + (code.startsWith("CODE") && code.length() == 8));
    }
}