接口練習之模拟銀行存取款

接口練習——模拟銀行存取款

要求：

1、 建立基接口BankAccount,包含 存款方法playIn(),取款方法withdraw(),查詢餘額方法getBalance()。

2、 建立接口ITransferBankAccount（繼承基接口BankAccount），包含轉賬方法transferTo().

3、 建立類CurrentAccount(實作基接口ITransferBankAccount)，類中包含私有資料成員：名字name和餘額balance

,并實作存款方法：playIn(),取款方法：withdraw()，查詢餘額getBanlance()，銀行轉賬方法transferTo()，

重載方法toString()方法，該方法傳回銀行目前賬戶中的餘額。

4、 主函數中：擁有兩個賬戶：分别為曹操和劉備，(1):曹操存款1000，劉備存款2000。 (2):劉備向曹操轉賬1元錢，傳回兩個賬戶目前的餘額。

interface BankAccount{  
    void playIn(int money);  
    void withdraw(int money);  
    int getBalance();  
}  
interface ITransferBankAccount extends BankAccount{  
    void transferTo(CurrentAccount ca,int money);  
}  
class CurrentAccount implements ITransferBankAccount{  

    private String name;  
    private int balance;  

    public CurrentAccount(String name, int balance) {  
        super();  
        this.name = name;  
        this.balance = balance;  
    }  

    @Override  
    public void playIn(int money) {  
        // TODO Auto-generated method stub  
        this.balance = this.balance+money;  
    }  

    @Override  
    public void withdraw(int money) {  
        // TODO Auto-generated method stub  
        this.balance = this.balance-money;  
    }  

    @Override  
    public int getBalance() {  
        // TODO Auto-generated method stub  
        return balance;  
    }  

    @Override  
    public void transferTo(CurrentAccount ca,int money) {  
        // TODO Auto-generated method stub  
        ca.balance = ca.balance+money;  
        this.balance = this.balance-money;  
    }  

}  
public class Test5 {  
    public static void main(String[] args) {  
        CurrentAccount caocao = new CurrentAccount("caocao",);  
        CurrentAccount liubei = new CurrentAccount("liubei",);  
        caocao.playIn();  
        liubei.playIn();  
        liubei.transferTo(caocao, );;  
        System.out.println("caocao balance :"+caocao.getBalance());  
        System.out.println("liubei balance :"+liubei.getBalance());  
    }  
}  
           

運作結果：