Java-Project01 家庭收支记账软件
1 class exces{ 2 3 public static void main(String[] args){ 4 5 boolean isFlag = true; 6 7 String details = ""; 8 int money = 10000; 9 10 11 while(isFlag){ 12 System.out.print("------------------家庭收支记账软件-----------------\n"); 13 System.out.print(" 1.收支明细\n"); 14 System.out.print(" 2.登记收入\n"); 15 System.out.print(" 3.登记支出\n"); 16 System.out.print(" 4.退 出\n"); 17 System.out.print(" 请选择（1-4）"); 18 int choice = Utility.readMenuSelection(); 19 switch(choice){ 20 case '1': 21 System.out.println("--------------------当前收入明细--------------------"); 22 System.out.print("收支" + "\t" + "账户金额" + "\t" + "收支金额" + "\t" + "说 明"+ "\n"); 23 System.out.print(details); 24 System.out.println("----------------------------------------------------"); 25 break; 26 case '2': 27 System.out.print("本次收入金额："); 28 int addMoney = Utility.readNumber(); 29 if(addMoney <= 0){ 30 System.out.println("输入错误,请重新选择"); 31 break;} 32 System.out.print("本次收入说明："); 33 String addInfo = Utility.readString(); 34 money = money + addMoney; 35 details += "收入\t" + money + "\t" + "\t" + addMoney + "\t" + "\t" + addInfo + "\n"; 36 break; 37 case '3': 38 System.out.print("本次支出金额："); 39 int lowMoney = Utility.readNumber(); 40 if(lowMoney <= 0){ 41 System.out.println("输入错误,请重新选择"); 42 break;} 43 System.out.print("本次支出说明："); 44 String lowInfo = Utility.readString(); 45 money = money - lowMoney; 46 if(money <= 0){ 47 System.out.println("输入金额溢出，请重新输入");} 48 details += "支出\t" + money + "\t" + "\t" + lowMoney + "\t" + "\t" + lowInfo + "\n"; 49 break; 50 case '4': 51 System.out.print("确定是否退出(Y/N):"); 52 char select = Utility.readConfirmSelection(); 53 if(select == 'Y'){ 54 System.out.println("祝您生活愉快！"); 55 isFlag = false; 56 }else if(select == 'N'){ 57 break; 58 } 59 } 60 61 } 62 } 63 }
import java.util.Scanner; /** Utility工具类： 将不同的功能封装为方法，就是可以直接通过调用方法使用它的功能，而无需考虑具体的功能实现细节。 */ public class Utility { private static Scanner scanner = new Scanner(System.in); /** 用于界面菜单的选择。该方法读取键盘，如果用户键入’1’-’4’中的任意字符，则方法返回。返回值为用户键入字符。 */ public static char readMenuSelection() { char c; for (; ; ) { String str = readKeyBoard(1); c = str.charAt(0); if (c != '1' && c != '2' && c != '3' && c != '4') { System.out.print("选择错误，请重新输入："); } else break; } return c; } /** 用于收入和支出金额的输入。该方法从键盘读取一个不超过4位长度的整数，并将其作为方法的返回值。 */ public static int readNumber() { int n; for (; ; ) { String str = readKeyBoard(4); try { n = Integer.parseInt(str); break; } catch (NumberFormatException e) { System.out.print("数字输入错误，请重新输入："); } } return n; } /** 用于收入和支出说明的输入。该方法从键盘读取一个不超过8位长度的字符串，并将其作为方法的返回值。 */ public static String readString() { String str = readKeyBoard(8); return str; } /** 用于确认选择的输入。该方法从键盘读取‘Y’或’N’，并将其作为方法的返回值。 */ public static char readConfirmSelection() { char c; for (; ; ) { String str = readKeyBoard(1).toUpperCase(); c = str.charAt(0); if (c == 'Y' || c == 'N') { break; } else { System.out.print("选择错误，请重新输入："); } } return c; } private static String readKeyBoard(int limit) { String line = ""; while (scanner.hasNext()) { line = scanner.nextLine(); if (line.length() < 1 || line.length() > limit) { System.out.print("输入长度（不大于" + limit + "）错误，请重新输入："); continue; } break; } return line; } }
参考代码:
1 public class FamilyAccount { 2 public static void main(String[] args) { 3 String details = "收支\t账户金额\t收支金额\t说 明\n"; 4 int balance = 10000; 5 6 boolean loopFlag = true; 7 do { 8 System.out.println("\n-----------------家庭收支记账软件-----------------\n"); 9 System.out.println(" 1 收支明细"); 10 System.out.println(" 2 登记收入"); 11 System.out.println(" 3 登记支出"); 12 System.out.println(" 4 退 出\n"); 13 System.out.print(" 请选择(1-4)："); 14 15 char key = Utility.readMenuSelection(); 16 System.out.println(); 17 switch (key) { 18 case '1': 19 System.out.println("-----------------当前收支明细记录-----------------"); 20 System.out.println(details); 21 System.out.println("--------------------------------------------------"); 22 break; 23 case '2': 24 System.out.print("本次收入金额："); 25 int amount1 = Utility.readNumber(); 26 System.out.print("本次收入说明："); 27 String desc1 = Utility.readString(); 28 29 balance += amount1; 30 details += "收入\t" + balance + "\t\t" + 31 amount1 + "\t\t" + desc1 + "\n"; 32 System.out.println("---------------------登记完成---------------------"); 33 break; 34 case '3': 35 System.out.print("本次支出金额："); 36 int amount2 = Utility.readNumber(); 37 System.out.print("本次支出说明："); 38 String desc2 = Utility.readString(); 39 40 balance -= amount2; 41 details += "支出\t" + balance + "\t\t" + 42 amount2 + "\t\t" + desc2 + "\n"; 43 System.out.println("---------------------登记完成---------------------"); 44 break; 45 case '4': 46 System.out.print("确认是否退出(Y/N)："); 47 char yn = Utility.readConfirmSelection(); 48 if (yn == 'Y') loopFlag = false; 49 break; 50 } 51 } while (loopFlag); 52 } 53 }
