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  • 练习3:修改withdraw 方法

    练习目标-使用有返回值的方法:在本练习里,将修改withdraw方法以返回一个布尔值来指示交易是否成功。

    任务

    1.修改Account类
    a.修改deposit 方法返回true(意味所有存款是成功的)。
    b.修改withdraw方法来检查提款数目是否大于余额。如果amt小于balance,则从余额中扣除提款数目并返回true,否则余额不变返回false。

    2.在exercise2主目录编译并运行TestBanking程序,将看到下列输出;

    Creating the customer Jane Smith.
    Creating her account with a 500.00 balance.
    Withdraw 150.00: true
    Deposit 22.50: true
    Withdraw 47.62: true
    Withdraw 400.00: false
    Customer [Smith, Jane] has a balance of 324.88

    //Account类

    package banking;

    public class Account {
    private double balance;
    public Account(double i)
    {
    balance=i;

    }
    public double getBalance()
    {
    	
    	return balance;
    }
    public boolean deposit(double i)
    {
    	balance+=i;
    	System.out.print("Deposit "+i);
    	return true;
    }
    public boolean withdraw(double i)
    {
    	if(balance>=i)
    	{
    	balance-=i;
    	System.out.print("Withdraw "+i);
    	return true;
    	}
    	else
    	{
    		System.out.print("余额不足");
    		return false;
    	}
    }
    

    }

    //Testbanking类

    package banking;

    public class TestBanking {

    public static void main(String[] args) {
    	Account a=new Account(500.00);
    	System.out.println("Creating an account with a "+a.getBalance()+"balance");
    	a.withdraw(150.00);
    	a.deposit(22.50);
    	a.withdraw(47.62);
    	System.out.println("The account has a balance of "+a.getBalance());
    	Customer c=new Customer("Jane", "Smith");
    	Account b=new Account(500.00);
    	c.setAccount(b);
    	a=c.getAccount();
    	System.out.println("Creating her account with a "+a.getBalance()+"balance");
    	System.out.println(":"+a.withdraw(150.00));
    	System.out.println(":"+a.deposit(22.50));
    	System.out.println(":"+a.withdraw(47.62));
    	System.out.println("Customer ["+c.getFirstName()+","+c.getLastName()+"] has a balance of  "+a.getBalance());
    	
    
    }
    

    }

    //运行

    Creating an account with a 500.0balance
    Withdraw 150.0Deposit 22.5Withdraw 47.62The account has a balance of 324.88
    Creating the customer Jane Smith
    Creating her account with a 500.0balance
    Withdraw 150.0:true
    Deposit 22.5:true
    Withdraw 47.62:true
    Customer [Jane,Smith] has a balance of 324.88

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  • 原文地址:https://www.cnblogs.com/nicebaby/p/5907025.html
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