Java_编写简单的家庭收支

Test类

import java.util.Scanner;
public class Family{
	public static void main(String[] args){
		// 定义初始金钱
		double money = 0.0;
		String arg = "收支\t账户金额\t\t收支金额\t\t说明\n";
		boolean falg = true;
		do{
		System.out.println("--------------------------家庭收支记账软件-----------------------\n");
		System.out.println("                            1.收支明细\n");
		System.out.println("                            2.登记收入\n");
		System.out.println("                            3.登记支出\n");
		System.out.println("                            4.  退出\n");
		System.out.print("\t\t请选择(1-4)：");
		int i = Function.shouye();
		switch(i){
			case 1:
			System.out.println(arg+'\n');
			break;
			case 2:
			System.out.print("本次收入金额:");
			double money1 = Function.shouye2();
			while(money1<0){
				System.out.println("您这是存钱，取钱请到3！\n 给我重新输：");
				money1 = Function.shouye2();
			}
			money += money1;
			System.out.print("请输入这钱的来源:");
			String yijuhua = Function.shuom();
			arg += "收入\t"+money+"\t\t\t"+money1+"\t\t\t"+yijuhua+"\n";
			System.out.println("----------------------登记完成----------------------------");
			// arg += "收入\t"+money+"\t\t"+money1+"\t\t"+"\n";
			break;
			case 3:
			System.out.print("本次支出金额:");
			double money2 = Function.shouye3();
			while(money2<0){
				System.out.println("请认真对待自己！重新输：");
				money2 = Function.shouye3();
			}
			while(money2>money){
				if(money==0)System.out.println("穷鬼哟！");
				System.out.println("请您现实一点！");
				money2 = Function.shouye3();
			}
			money -= money2;
			System.out.print("请说明这钱的用途：");
			String erjuhua = Function.shuom();
			arg += "支出\t"+money+"\t\t\t"+money2+"\t\t\t"+erjuhua+"\n";
			System.out.println("----------------------登记完成----------------------------");
			break;
			case 4:
			System.out.print("确认是否退出(Y/N):");
			char yn = Function.yesno();
			if(yn == 'Y'){
				//return false;
				falg = false;
			}
			
		/*	case '4':
					System.out.print("确认是否退出(Y/N):");
				    char yn = Function.yesno();
					if(yn=='Y'){
						falg = false;//当确认退出时，退出循环
					}
			break;*/
		}
		}while(falg);
		
	}
	
}

功能模块

import java.util.*;
public class Function{
	// 首页1-4选项
	public static int shouye(){
		Scanner sc = new Scanner(System.in);
		// 输入整数1,2,3,4,
		int i = sc.nextInt();
		while(true){
		if(i != 1 && i !=2 && i != 3 && i !=4){
			System.out.println("选择错误，请重新输入：");
			i = sc.nextInt();
		}else break;
		}
		return i;
	}
	
	// 收入的钱
	public static double shouye2(){
		Scanner sc = new Scanner(System.in);
		double shouru = sc.nextDouble();
		//shouru1 = shouru;
		return shouru;
	}
	
	// 说明
	public static String shuom(){
		Scanner sc = new Scanner(System.in);
		String sm = sc.nextLine();
		return sm;
	}
	// 支出的钱
	public static double shouye3(){
		Scanner sc = new Scanner(System.in);
		double zhichu = sc.nextDouble();
		return zhichu;
	}
	// 输入yn
	public static char yesno(){
		Scanner sc = new Scanner(System.in);
		char yn = sc.next().charAt(0);
		// 改变大小写
		while(true){
		if(yn == 'y'){
			yn = 'Y';break;
		}else if(yn == 'n'){
			yn = 'N';break;
		}else if (yn != 'Y' || yn != 'N') {
                System.out.print("再给你一次机会，输入Y/N：");
				yn = sc.next().charAt(0);
            } else{
				System.out.println(yn);break;
			}
			}
		/*	switch(yn){
				case 'y':yn = 'Y';break;
				case 'n':yn = 'N';break;
				case 'Y':yn = 'Y';break;
				case 'N':yn = 'N';break;
				default:System.out.print("选择错误，请重新输入：");
			}*/
		return  yn;
	}
	
/*	public static char readConfirmSelection() {
	Scanner str = new Scanner(System.in);
        char c;
        for (; ; ) {
        //    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;
    }*/
}