java 家庭收支账户

Posted 2022-01-27 DQ_CODING

代码1

package lesson.project.p1_familyAccount;

import java.util.Scanner;

public class FamilyAccount 

    public static int money = 10000;
    public static String all = "";

    public static void main(String[] args) 
        Scanner scanner = new Scanner(System.in);
        while (true) 
            show();
            String s = scanner.next();
            switch (s) 
                case "1":
                    show();
                    System.out.println("收支\\t金额\\t明细\\t");
                    System.out.println(all);
                    System.out.println("余额：" + money);
                    break;
                case "2"://收入
                        System.out.println("金额：");
                        String b = scanner.next();
                        System.out.println("明细：");
                        String d = scanner.next();
                        all+="收入"+"\\t"+b+"\\t"+d+"\\t"+"\\n";
                        money += Integer.parseInt(b);
                    break;
                case "3"://支出
                    System.out.println("金额：");
                    String b1 = scanner.next();
                    System.out.println("明细：");
                    String d1 = scanner.next();
                    all+="支出"+"\\t"+b1+"\\t"+d1+"\\t"+"\\n";
                    money -= Integer.parseInt(b1);
                    break;
                case "4":
                    while (true) 
                        System.out.println("是否要退出?(Y\\\\N)");
                        String choose = scanner.next();
                        if (choose.equals("Y") || choose.equals("y")) 
                            System.exit(0);
                         else if (choose.equals("N") || choose.equals("n")) 
                            break;
                         else 
                            System.out.println("输入不合法！请重新输入");
                        
                    
                    break;
                default:
                    System.out.println("输入不合法！请重新输入");
                    show();
                    break;

            
        

    

    public static void show() 
        System.out.println("家庭收支账户：");
        System.out.println("1.查看账户");
        System.out.println("2.增加收入");
        System.out.println("3.减少收入");
        System.out.println("4.退出账户");
        System.out.println("请选择功能：");

    

代码2

工具类

package lesson.project.p1_familyAccount.version2;

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;
    

家庭收支

package lesson.project.p1_familyAccount.version2;

public class FamilyAccount 
    public static void main(String[] args) 
        String details = "收支\\t账户金额\\t收支金额\\t说    明\\n";
        int balance = 10000;

        boolean loopFlag = true;
        do 
            System.out.println("\\n-----------------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)：");

            char key = Utility.readMenuSelection();
            System.out.println();
            switch (key) 
                case '1':
                    System.out.println("-----------------当前收支明细记录-----------------");
                    System.out.println(details);
                    System.out.println("--------------------------------------------------");
                    break;
                case '2':
                    System.out.print("本次收入金额：");
                    int amount1 = Utility.readNumber();
                    System.out.print("本次收入说明：");
                    String desc1 = Utility.readString();

                    balance += amount1;
                    details += "收入\\t" + balance + "\\t\\t" +
                            amount1 + "\\t\\t" + desc1 + "\\n";
                    System.out.println("---------------------登记完成---------------------");
                    break;
                case '3':
                    System.out.print("本次支出金额：");
                    int amount2 = Utility.readNumber();
                    System.out.print("本次支出说明：");
                    String desc2 = Utility.readString();

                    balance -= amount2;
                    details += "支出\\t" + balance + "\\t\\t" +
                            amount2 + "\\t\\t" + desc2 + "\\n";
                    System.out.println("---------------------登记完成---------------------");
                    break;
                case '4':
                    System.out.print("确认是否退出(Y/N)：");
                    char yn = Utility.readConfirmSelection();
                    if (yn == 'Y') loopFlag = false;
                    break;
            
         while (loopFlag);