使用java选择循环结构修改密码（控制台实现）

创建类AdministrationPassword.java

package javaoop.adminpass;

import java.util.Scanner;

public class AdministrationPassword {
    private String userName;
    private String password;

    public String show() {
        return "用户名：" + this.userName + " 密码：" + this.password;
    }

    public void login(String userName, String password) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入用户名：");
        String name = scanner.next();
        while (true) {
            if (name.equals(userName)) {
                this.userName = userName;
                System.out.print("请输入原密码：");
                String sourcePass = scanner.next();
                if (sourcePass.equals(password)) {
                    String newPass;
                    String surePass;
                    do {
                        System.out.print("请输入新密码：");
                        newPass = scanner.next();
                        System.out.print("确认新密码：");
                        surePass = scanner.next();
                        if (newPass.equals(surePass)) {
                            password = surePass;
                            //修改完成输出提示
                            System.out.println(userName + "恭喜您密码已成功修改为" + password);
                            this.password = password;
                            //查看修改后信息
                            System.out.println(show());
                            System.exit(0);
                        }else{
                            System.out.print("两次密码不一致");
                        }
                    } while (newPass.equals(surePass));
                } else {
                    System.out.print("对不起原密码不正确！");
                }
            } else {
                System.out.print(name+"用户不存在！请重新输入：");
                name = scanner.next();
            }
        }
    }
}

测试类Test01.java

public class Test01 {
    public static void main(String[] args) {
       String[] save = {"张三","123123"};
        AdministrationPassword administrationPassword = new AdministrationPassword();
        administrationPassword.login(save[0],save[1]);
    }
}

运行结果：