《家庭記賬軟件》

模擬是實現一個基于文本界面的《家庭記賬軟件》

該程序是全網最全Java零基礎入門教程的項目一，可以直接查看p127

• 掌握逐步的編程技巧和調試技巧
• 主要涉及以下知識點：
  • 變量的定義
  • 基本數據類型的使用
  • 循環語句
  • 分支語句
  • 方法聲明、調用和返回值的接收
  • 簡單的屏幕輸出格式

話不多說直接上代碼

源代碼

• Utility.java

import java.util.Scanner;/*** @ClassName: Utility* @Author: Y_peak* @Date: 2021/08/09/19:14*/ public class Utility {private static Scanner scanner = new Scanner(System.in);public static char readMenuSelection(){char c;while (true){String str = readKeyBoard(1);c = str.charAt(0);if (c != '1' && c != '2' && c!='3' && c!='4'){System.out.print("選擇錯誤，請重新選擇:");}else break;}return c;}public static int readNumber(){int n;while (true){String str = readKeyBoard(4);try{n = Integer.parseInt(str);break;}catch (NumberFormatException e){System.out.print("數字輸入錯誤，請重新輸入: ");}}return n;}public static String readString(){String str = readKeyBoard(8);return str;}public static char readConfirmSelection(){char c;while (true){String str = readKeyBoard(1).toUpperCase();c=str.charAt(0);if (c == 'Y' || c=='N'){break;}else {System.out.print("選擇輸入錯誤，請重新輸入：");}}return c;}public static String readKeyBoard(int n){while (true){String str = scanner.next();int len = str.length();if (len <= n){return str;}else {System.out.print("輸入錯誤，請重新輸入：");}}}}

• FamilyAccount.java

import javax.sound.midi.Soundbank;/*** @ClassName: FamilyAccount* @Author: Y_peak* @Date: 2021/08/09/19:30*/ public class FamilyAccount {public static void main(String[] args) {boolean isFlag = true;String userIncomeDetails = ""; //總的收支細節int initAccount = 100000; //初始余額String instruction; //單次收支細節int money; //收支金額while (isFlag){System.out.println("-----------家庭收支記賬軟件-----------\n");System.out.println(" 1.收支明細 ");System.out.println(" 2.登記收入");System.out.println(" 3.登記支出");System.out.println(" 4.退 出");System.out.print(" 請選擇：");char selection = Utility.readMenuSelection();switch (selection){case '1':System.out.println("-------------當前收支明細記錄---------");System.out.println("收支\t賬戶金額\t收支金額\t說 明");System.out.println(userIncomeDetails);System.out.println("-----------------------------------");break;case '2':System.out.print("本次收入金額：");money = Utility.readNumber();System.out.print("本次收入說明：");instruction = Utility.readString();initAccount += money;if(money>=1000)userIncomeDetails += "收入\t" + initAccount + '\t' + money + '\t' + instruction + '\n';elseuserIncomeDetails += "收入\t" + initAccount + '\t' + money + "\t\t" + instruction + '\n';System.out.println("--------------登記完成---------------");break;case '3':System.out.print("本次支出金額：");money = Utility.readNumber();System.out.print("本次支出說明：");instruction = Utility.readString();if(money>initAccount){System.out.println("支出超出支付額度，支付失敗····");}else {initAccount -= money;if(money>=1000)userIncomeDetails += "支出\t" + initAccount + '\t' + money + '\t' + instruction + '\n';elseuserIncomeDetails += "支出\t" + initAccount + '\t' + money + "\t\t" + instruction + '\n';System.out.println("--------------登記完成---------------");}break;case '4':System.out.println("確認是否退出（Y/N)：");if(Utility.readConfirmSelection() == 'Y') {isFlag = false;}break;}}} }

總結

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