Bank Account

Points: 40 (partial)

Time limit: 1.0s

Memory limit: 256M

Authors:

scu09156238, scu09156146

Problem types

Allowed languages

Java 19, Java 8

題目說明

請設計Bank類別，其中包含以下方法：

calculateInterest()：計算計息後資產，並回傳double值
                     計息後資產 = 資產 * (1+月利率)

deposit()：記錄存款，印出存款後資產，寫System.out.printf("Assets after deposit: $%,.2f\n", assets);

withdraw()：記錄提款，印出提款後資產，寫System.out.printf("Assets after withdraw: $%,.2f\n", assets);
            若提款餘額不足，印出"You are BROKE!"，並終止程式

主程式須執行以下步驟：

建立Bank物件
接鍵盤輸入的數值資料(資產、月利率，存款1、提款1、存款2、提款2)
使用deposit()、withdraw()執行兩次存款、提款
使用calculateInterest()方法，並印出回傳值，格式使用"Bank statement: $%,.2f\n"

// 【.printf說明】"$"字號、三位一撇、四捨五入到小數第二位

輸入

資產、月利率
存款1、提款1、存款2、提款2

輸出

Bank statement: $資產金額

測試資料0 輸入

1000 0.2
60 900 7500 60

測試資料0 輸出

Assets after deposit: $1,060.00
Assets after withdraw: $160.00
Assets after deposit: $7,660.00
Assets after withdraw: $7,600.00
Bank statement: $9,120.00

測試資料1 輸入

1000 0.5
50 900 750 1500

測試資料1 輸出

Assets after deposit: $1,050.00
Assets after withdraw: $150.00
Assets after deposit: $900.00
You are BROKE!

Comments

scu09156146 commented on May 7, 2024, 5:52 p.m.

題解

import java.util.Scanner;

class Bank {
    // Field，定義Bank類別的參數
    private double assets; // 存款本金不可讓外部直接存取，設定成private
    public double monthlyIR;

    // Constructor，建構Bank物件
    public Bank(double a, double mIR) {
        assets = a;
        monthlyIR = mIR;
    }

    // Method，定義類別的方法：calculateInterest()、deposit()、withdraw()
    public double calculateInterest() { // 計算計息後資產
        return assets * (1 + monthlyIR);
    }

    public void deposit(double n) { // 存款
        assets += n;
        System.out.printf("Assets after deposit: $%,.2f\n", assets);
    }

    public void withdraw(double n) { // 提款
        if (assets - n < 0) {
            System.out.println("You are BROKE!");
            System.exit(0);
        } else {
            assets -= n;
            System.out.printf("Assets after withdraw: $%,.2f\n", assets);
        }
    }

}

public class BankAccount {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);

        Bank myBank = new Bank(input.nextDouble(), input.nextDouble()); // 資產、月利率

        myBank.deposit(input.nextDouble());     // 第1筆存款
        myBank.withdraw(input.nextDouble());    // 第1筆提款
        myBank.deposit(input.nextDouble());     // 第2筆存款
        myBank.withdraw(input.nextDouble());    // 第2筆提款
        input.close();

        System.out.printf("Bank statement: $%,.2f\n", myBank.calculateInterest());
    }

}