为什么输入密码错误后还可以继续操作 在哪里加返回值

import java.util.*;

public class as {
    static int zhanghao = 123456789;
    static int mima = 123456;
    static int yue=1000+(int)(Math.random()*4000);
    static Scanner in = null;
    public as(int mima) {
        this.mima = mima;   
    }
    public static void denglu() {
        System.out.println("欢迎使用***银行ATM");
        System.out.println("====================");
        in = new Scanner(System.in);
        int i=0;
        do{
        System.out.println("请输入登录密码：");
        int denglumima = in.nextInt();
        if ( denglumima == mima){
            System.out.println("帐号登录成功" + "\n");
        break;}
        else{
            System.out.println("密码输入错误，登录失败" + "\n");
        i++;
        if(i==3){
            System.out.println("密码输入错误3次，银行卡被冻结");
            System.exit(0);
;        }
        }
        }
        while(i<3);
    }
    public static void main(String[] args) {
        denglu();
        
        int count = 1;
        while (count != 0) {
            System.out.println("1、查询余额");
            System.out.println("2、取款");
            System.out.println("3、存款");
            System.out.println("4、修改密码");
            System.out.println("5、结束交易");
            System.out.println("====================");
            System.out.println("请选择交易（1-5）");
            count = in.nextInt();
            switch (count) {
            case 1:
                System.out.println(1000+(int)(Math.random()*4000));
                System.out.println();
                break;
            case 2:
                quKuan();
                break;
            case 3:
                cunKuan();
                break;
            case 4:
                xiugai();
                break;
            case 5:
                System.exit(0);
            }
        }
    }


    public static void quKuan() {
        System.out.println("请输入取款金额：");
        int qukuanjine = in.nextInt();
        if (qukuanjine > 5000) {
            System.out.println("取款金额不能大于5000" + "\n");
        } else {
            if (qukuanjine % 100 != 0) {
                System.out.println("取款金额必须为100的整数倍" + "\n");
            } else {
                yue = yue - qukuanjine;
                System.out.println("您取出了" + qukuanjine + "元，您现在的余额为：" + yue
                        + "元" + "\n");
            }
        }
    }

    public static void cunKuan() {
        System.out.println("请输入存款金额");
        int cunkuanjine = in.nextInt();
        if (cunkuanjine < 0) {
            System.out.println("存款金额不能小于0");
        } else {
            yue = yue + cunkuanjine;
            System.out.println("您已成功存入：" + cunkuanjine + "元，您现在总余额为：" + yue
                    + "元" + "\n");
        }
    }

    public static void xiugai() {
        System.out.println("请输入您的密码：");
        int mima1 = in.nextInt();
        if (mima1 == mima) {
            System.out.println("请输入新密码：");
            mima = in.nextInt();
            System.out.println("您的密码已修改为：" + mima + "\n");
        } else {
            System.out.println("密码输入错误：" + "\n");
        }
    }
}

是啊