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一个模拟信用卡支出系统的小Java程序

一.主类代码如下：

public class Customer

{

private long accoutnumber;

private double overage;

private double income;

private double buyoncredit;

private double percredit;

public void setAccoutNumber(long

imAccoutNumber)

{

accoutnumber=imAccoutNumber;

}

public long getAccoutNumber()

{

return accoutnumber;

}

public void setOverage(double imOverage)

{

overage=imOverage;

}

public double getOverage()

{

return overage;

}

public void setIncome(double imIncome)

{

income=imIncome;

}

public double getIncome()

{

return income;

}

public void setBuyOnCredit(double

imBuyOnCredit)

{

buyoncredit=imBuyOnCredit;

}

public double getBuyOnCredit()

{

return buyoncredit;

}

public void setPercredit(double

imPercredit)

{

percredit=imPercredit;

}

public double getPercredit()

{

return percredit;

}

}

二.测试类代码如下：

import java.util.Scanner;

public class CustomerTest

{

public static void main(String args[])

{

Customer customer=new Customer();

Scanner input=new Scanner(System.in);

double newoverage;

int counter=1;

Long depositAccoutNumber;

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double depositOverage;

double depositIncome;

double depositBuyOnCredit;

double depositPercredit;

System.out.printf("\nEnter the accoutnumber

for customer:");

depositAccoutNumber=input.nextLong();

System.out.printf("Enter the overage for customer:");

depositOverage=input.nextDouble();

System.out.printf("Enter the income for customer:");

depositIncome=input.nextDouble();

System.out.printf("Enter the buyoncredit for customer:");

depositBuyOnCredit=input.nextDouble();

System.out.printf("Enter the percredit for customer:");

depositPercredit=input.nextDouble();

System.out.printf("\n");

while(depositAccoutNumber!=-1)

{

customer.setAccoutNumber(depositAccoutNumber);

System.out.printf("customer%d:\n accoutnumber:

%d\n",counter,customer.getAccoutNumber());

customer.setOverage(depositOverage);

System.out.printf(" overage:

%.2f$\n",customer.getOverage());

customer.setIncome(depositIncome);

System.out.printf(" income:

%.2f$\n",customer.getIncome());

customer.setBuyOnCredit(depositBuyOnCredit);

System.out.printf(" buyoncredit:

%.2f$\n",customer.getBuyOnCredit());

customer.setPercredit(depositPercredit);

System.out.printf(" percredit:

%.2f$\n",customer.getPercredit());

newoverage=depositOverage+depositIncome-depositBuyOnCredit;

if(newoverage>depositPercredit)

System.out.printf(" Pay Attention:Credit limit

exceeded!\n");

++counter;

System.out.printf("\nEnter the accoutnumber

for customer:");

depositAccoutNumber=input.nextLong();

if(depositAccoutNumber==-1);

else

{

System.out.printf("Enter the overage for customer:");

depositOverage=input.nextDouble();

System.out.printf("Enter the income for customer:");

depositIncome=input.nextDouble();

System.out.printf("Enter the buyoncredit for customer:");

depositBuyOnCredit=input.nextDouble();

System.out.printf("Enter the percredit for customer:");

depositPercredit=input.nextDouble();

System.out.printf("\n");

}

}

}

}

三.对程序代码的说明：

accoutnumber 帐号

overage 透支限度

income 本月收入

buyoncredit 本月信用卡支出

percredit 信用卡原有存款

运行程序后将判断该用户是否透支,并输出本月的消费信息。