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Java 练习(家庭收支记账软件)

作者:互联网

工具类:Utility.java

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;
    }
}

FamilyAccount.java

class FamilyAccount{
	public static void main(String[] args){
		boolean isFlag = true;
		//记录用户的收入和支出的详情
		String details = "类型 \t 账号余额 \t\t 收支金额 \t\t 说明 \n";
		
		//初始金额
		int balance = 10000;
		
		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\n");
			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("----------------当期收支明细记录----------------");
					System.out.println(details);
					System.out.println("--------------------------------------------------------");
					break;
				case '2':
					System.out.print("本次收入金额: ");
					int addMoney = Utility.readNumber();
					System.out.print("本次收入说明: ");
					String addInfo = Utility.readString();
					
					//处理 balance
					balance += addMoney;
					
					//处理details
					details += ("收入\t" + balance + "\t\t\t" + addMoney + "\t\t\t" + addInfo + "\n");
					
					System.out.println("----------------登记完成----------------\n");
					
					break;
				case '3':
					System.out.print("本次支出金额: ");
					int minusMoney = Utility.readNumber();
					System.out.print("本次支出说明: ");
					String minusInfo = Utility.readString();
					
					//处理 balance
					if(balance >= minusMoney){
						balance -= minusMoney;
						
						//处理details
						details += ("支出\t" + balance + "\t\t\t" + minusMoney + "\t\t\t" + minusInfo + "\n");
					}else{
						System.out.println("支出超出账户额度,支付失败");
					}
					
					
					
					
					System.out.println("----------------登记完成----------------\n");
					break;
				case '4':
					System.out.print("确认是否退出(Y/N): ");
					char isExit = Utility.readConfirmSelection();
					if(isExit == 'Y'){
						isFlag = false;
					}
					
			}
		}
	
	}
}

效果:

标签:Java,String,System,收支,print,记账,println,Utility,out
来源: https://www.cnblogs.com/klvchen/p/14252754.html