Java 程序无法正确添加金额

Question

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已关闭 10 年前。

所以我对java还很陌生。我已经写了这个，但不确定为什么当我运行它时，金额不会添加到客户端中设置的内容。

例如:我输入 500 作为起始余额，如果我点击存款，然后输入 500，然后点击案例 3，它应该显示 1000，但它仍然显示 500。然后如果我点击提款，它会显示我 - 500。

有什么想法吗？谢谢

package bankaccount;
import java.util.Random;
import java.util.Scanner;

public class Client {
 public static void main(String args[]) {
     Scanner input = new Scanner(System.in);       
     System.out.println("Enter your Name: ");
            String cusName = input.nextLine();
            Random randomGenerator = new Random();
            int accNo = randomGenerator.nextInt(100000);
            System.out.println("Enter Initial Balance: ");
            int balance = input.nextInt();
            BankAccount b1 = new BankAccount(cusName, accNo, balance);
            int menu;
            System.out.println("Menu");
            System.out.println("1. Deposit Amount");
            System.out.println("2. Withdraw Amount");
            System.out.println("3. Display Information");
            System.out.println("4. Exit");
            boolean quit = false;
            do {
                    System.out.print("Please enter your choice: ");
                    menu = input.nextInt();
                    switch (menu) {
                    case 1:            
                             System.out.print("Enter depost amount:");
                             Money.amount = input.nextInt(); 
                             b1.getDeposit(); 

                            break;

                    case 2:
                             System.out.println("Current Account Balance=" + b1.getBalance());
                             System.out.print("Enter withdrawal amount:");
                             Money.amount = input.nextInt();
                             b1.getWithdraw();

                            break;

                    case 3:
                            b1.display();
                            break;
                    case 4:
                            quit = true;
                            break;
                    }
            } while (!quit);
    }

<小时/>

public class Money
{

public static int accountNumber, balance=0;
static int amount;

static String name;
public void setDeposit(int amount) {   

            balance = balance + amount;   
    }
public int getDeposit()
{

            balance = balance + amount;
            if (amount < 0) {
                    System.out.println("Invalid");
            }
                                    return 1; 

}
 public void setBalance(int b)
 {
     b = balance;
 }
 public int getBalance()
 {
     return balance;
 }

 public void setWithdraw(int amount)  {


            balance = balance - amount;
    }
 public int getWithdraw()
 {
            balance = balance - amount;
     if (balance < amount) 
     {
                    System.out.println("Not enough funds.");
                    return 1;
            }
           else if (amount < 0) {
                    System.out.println("Invalid");
                    return 1;}
                    else 
                             return 0;
 }

<小时/>

import java.util.*;

public class BankAccount extends Money {
    static String name;
    public static int balance, amount, acctNum;
    Money customerMoney;


    BankAccount(String name, int accNo, int bal) {
            this.name = name;
            this.acctNum = accNo;
            this.balance = bal;
            this.customerMoney = new Money();
    }
            void display() {
            System.out.println("Name:" + name);
            System.out.println("Account No:" + acctNum);
            System.out.println("Balance:" + balance);

    }

    void displayBalance() {
            System.out.println("Balance:" + balance);
    }
    public Money getMoney(){
          return this.customerMoney;
    }
}

Answer 1

最大的问题是语句balance=0

public static int accountNumber, balance=0;
                                 ^^^^^^^^^

每次您要插入金额时，您的余额都是零。

您应该使用setDeposit(input.nextInt())

在public void setBalance(int b)中，b = Balance;应该是balance = b;

此外，您的 amount、balance 变量应为 Float，而不是 int 作为 balance/金额可以是23434.22。