一：上碼

package com.wyj.two;import java.util.Scanner;/*** 封裝的練習*/ public class Demo8 {public static void main(String[] args) {Scanner in = new Scanner(System.in);Account account = new Account();System.out.println("歡迎來到杰哥銀行");// menu();boolean flag = true;while (flag) {menu();System.out.println("請輸入你的服務選項：");int option = in.nextInt();switch (option) {case 1: {account.open_account();break;}case 2: {account.save_money();break;}case 3: {account.draw_money();break;}case 4: {account.check();break;}case 5: {System.out.println("感謝您的使用！！");flag = false;break;}}}}//菜單欄public static void menu() {System.out.println("1.設置用戶的基本信息（姓名，新建賬戶，新建密碼）");System.out.println("2.存錢");System.out.println("3.取錢");System.out.println("4.查詢余額");System.out.println("5.退出");}}class Account {private String name;private double balance;//余額private String acc;//賬戶private String password;//密碼Scanner in = new Scanner(System.in);public void setName(String name) {if (name.length() >= 2 && name.length() <= 4)this.name = name;else {System.out.println("請輸入正確格式的姓名，默認姓名：無名");this.name = "無名";}}public void setBalance(double balance) {if (balance > 20)this.balance = balance;else {System.out.println("余額不足，余額默認為：20");this.balance = 20;}}public void setPassword(String password) {if (password.length() == 6)this.password = password;else {System.out.println("密碼格式有誤，密碼為6為字符，默認為123456");this.password = "123456";}}public void setAcc(String acc) {this.acc = acc;}public String getName() {return name;}public double getBalance() {return balance;}public String getPassword() {return password;}public String getAcc() {return acc;}//開戶public void open_account(){System.out.println("請輸入姓名：");String name = in.next();//不用in.nextLine();他會把一些無效字符給讀進去this.name = name;System.out.println("請輸入新建賬號:");// in.nextLine();//將換行符讀掉String acc = in.next();this.acc =acc;System.out.println("請輸入新建密碼:");// in.nextLine();//將換行符讀掉String pas = in.next();this.password = pas;System.out.println("恭喜您開戶成功！");}//存錢public void save_money() {System.out.print("請輸入您的賬號：");String acc1 = in.next();System.out.print("請輸入您的密碼：");String pas1 = in.next();System.out.print("請輸入存錢的金額：");double money = in.nextDouble();boolean flag = true;while (flag) {if (acc1.equals(this.acc) && pas1.equals(this.password)) {if (money < 0)money = 0;this.balance += money;System.out.println("存錢成功!");flag = false;} else if (!acc1.equals(this.acc) && pas1.equals(this.password)) {System.out.println("您輸入的賬號有誤！請重新輸入您的賬號");acc1 = in.nextLine();} else if (acc1.equals(this.acc) && !pas1.equals(this.password)) {System.out.println("您輸入的密碼有誤，請重新輸入您的密碼");pas1 = in.nextLine();}}}//取錢public void draw_money() {System.out.println("請輸入您的賬號：");in.nextLine();//將換行符讀掉String acc1 = in.next();System.out.println("請輸入您的密碼：");in.nextLine();//將換行符讀掉String pas1 = in.next();System.out.println("請輸入取錢的金額：");double money = in.nextDouble();boolean flag = true;while (flag) {if (acc1.equals(this.acc) && pas1.equals(this.password)) {if (money < 0)money = 0;if(this.balance < money){System.out.println("對不起您的余額不足！");}else{this.balance -= money;System.out.println("取錢成功！");}flag = false;} else if (!acc1.equals(this.acc) && pas1.equals(this.password)) {System.out.println("您輸入的賬號有誤！請重新輸入您的賬號");acc1 = in.nextLine();} else if (acc1.equals(this.acc) && !pas1.equals(this.password)) {System.out.println("您輸入的密碼有誤，請重新輸入您的密碼");pas1 = in.nextLine();}}}//查詢余額public void check() {System.out.println("請輸入您的賬號：");String acc1 = in.next();System.out.println("請輸入您的密碼：");String pas1 = in.next();boolean flag = true;while (flag) {if (acc1.equals(this.acc) && pas1.equals(this.password)) {System.out.println("您的余額為：" + this.balance);flag = false;} else if (!acc1.equals(this.acc) && pas1.equals(this.password)) {System.out.println("您輸入的賬號有誤！請重新輸入您的賬號");acc1 = in.nextLine();} else if (acc1.equals(this.acc) && !pas1.equals(this.password)) {System.out.println("您輸入的密碼有誤，請重新輸入您的密碼");pas1 = in.nextLine();}}}@Overridepublic String toString() {return "Account{" +"name='" + name + '\'' +", balance=" + balance +", password='" + password + '\'' +'}';} }

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