尚硅谷java——项目一 家庭收支记账软件

class FamilyAccount{
    public static void main(String[] args){
        boolean isFlag = true;
        String details = "收支t账户金额tt收支金额tt说 明n";
        int balance = 1000;
        while(isFlag){
            System.out.println("----------------家庭收支记账软件----------------n");
            System.out.println("                1.收支明细");
            System.out.println("                2.登记收入");
            System.out.println("                3.登记支出");
            System.out.println("                4.退出");
            System.out.print("                请选择(1-4)：");
            //获取用户的选择：1-4
            char selection = Utility.readMenuSelection();
           switch(selection) {
           case '1':
               System.out.println("本次收入金额：");
               System.out.println(details+"nn");
               break;
               
           case '2':
               System.out.println("本次收入金额：");
               int addMoney = Utility.readNumber();
               System.out.println("本次收入说明：");
               String addInfo = Utility.readString();
               balance+=addMoney;
               details+=("收入t"+balance+"tt"+addMoney+"tt"+addInfo+"n");
               System.out.println("当前等级完成nn");
               break;
               
           case '3':
               System.out.println("本次支出金额：");
               int minusMoney = Utility.readNumber();
               System.out.println("本次支出说明：");
               String minusInfo = Utility.readString();
               if(balance>=minusMoney) {
                   balance-=minusMoney;
               }
               details+=("收入t"+balance+"tt"+minusMoney+"tt"+minusInfo+"n");
               System.out.println("当前登记完成nn");
               break;
               
           case '4':
               System.out.println("是否确认退出？");
               char isExit = Utility.readConfirmSelection();
               if(isExit=='y') {
                   isFlag=false;
               }
                   break;
           }

        }
    }
}

//Utility工具类，将不同功能封装为方法，通过调用方法使用它的功能；

import java.util.Scanner;
public class Utility{
    private static Scanner scanner = new Scanner(System.in);
    //界面菜单的选择
    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
    public static int readNumber(){
        int n;
        for(; ;){
            String str = readKeyBoard(4);//从键盘读取数的位数
            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;
    }
    //用于收入和支出的说明
    public static String readString(){
        String str = readKeyBoard(8);
        return str;
    }
    //用于确认选择的输入，从键盘度Y和N
    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;
    }
    public static String readKeyBoard(int n){
        Scanner scanner = new Scanner(System.in);
        String str = scanner.next();
        return str;
    }
}