银行计算利息

package bank;



public class Bank {		//基类

	int savedMoney;

	int year;

	double interest;

	double interestRate=0.29;

	public double computerInterest()

	{

		interest=year*interestRate*savedMoney;

		return interest;

	}

	public void setInterestRate(double rate)

	{

		interestRate=rate;

	}

}

package bank;



public class BankOfDalian extends Bank {

	double year;

	public double computerInterest()

	{

		super.year=(int)year;

		double r=year-(int)year;

		int day=(int)(r*1000);

		double yearInterest=super.computerInterest();

		double dayInterest=day*0.00012*savedMoney;

		interest=yearInterest+dayInterest;

		System.out.printf("%d元存在大连银行%d年零%d天的利息：%f元\n",savedMoney,super.year,day,interest);

		return interest;

	}

}

 

package bank;



public class ConstructionBank extends Bank {

	double year;

	public double computerInterest()

	{

		super.year=(int)year;

		double r=year-(int)year;

		int day=(int)(r*1000);

		double yearInterest=super.computerInterest();

		double dayInterest=day*0.0001*savedMoney;

		interest=yearInterest+dayInterest;

		System.out.printf("%d元存在建设银行%d年零%d天的利息：%f元\n",savedMoney,super.year,day,interest);

		return interest;

	}



}

 

package bank;



public class SaveMoney {



	/**

	 * @param args

	 */

	public static void main(String[] args) {

		// TODO Auto-generated method stub

		int amount=8000;

		ConstructionBank bank1=new ConstructionBank();

		bank1.savedMoney=amount;

		bank1.year=8.236;

		bank1.setInterestRate(0.035);

		double interest1=bank1.computerInterest();

		BankOfDalian bank2=new BankOfDalian();

		bank2.savedMoney=amount;

		bank2.year=8.236;

		bank2.setInterestRate(0.035);

		double interest2=bank2.computerInterest();

		System.out.printf("两个银行利息相差%f元\n",interest2-interest1);

	}

}