例5-5、例5-6和例5-7

class A{
   public int f(int x,int y){
     return x+y;
    }
   }
   class B extends A{
    public int f(byte x,int y){
     return x*y;
    }
   }
   public class Example5_5{
     public static void main(String args[]){
       int z=0;
       B b=new B();
       z=b.f(10,10);
       System.out.println(z);
       z=b.f((byte)10,10);
       System.out.println(z);
     }
   }
    

class A{
 int x,y;
 A(){
   x=100;
   y=200;
 }
 A(int x,int y){
   this.x=x;
   this.y=y;
 }
}
class B extends A{
    int z;
    B(int x,int y){
        super(x,y);
        z=300;
    }
    B(){
        super();
        z=800;
    }
    public void f(){
        System.out.printf("x=%d,y=%d,z=%d\n",x,y,z);
    }
}
public class Example5_6{
    public static void main(String args[]){
        B b1=new B(10,20);
        b1.f();
        B b2=new B();
        b2.f();
    }
}
     
     

public class Bank{
 int savedMoney;
 int year;
 double interest;
 public double computerInterest(){
  interest=year*0.035*savedMoney;
  System.out.printf("%d元存在银行%d年的利息:%f元\n",savedMoney,year,interest);
  return interest;
 }
}

public class ConstructionBank extends Bank{
 double year;
 public double computerInterest(){
   super.year=(int)year;
   double remainNumber=year-(int)year;
   int day=(int)(remainNumber*1000);
   interest=super.computerInterest()+day*0.0001*savedMoney;
   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;
 }
}

public class BankOfDalian extends Bank{
 double year;
 public double computerInterest(){
   super.year=(int)year;
   double remainNumber=year-(int)year;
   int day=(int)(remainNumber*1000);
   interest=super.computerInterest()+day*0.0002*savedMoney;
   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;
 }
}

public class Example5_7{
 public static void main(String args[]){
  int amount=5000;
  ConstructionBank bank1=new ConstructionBank();
  bank1.savedMoney=amount;
  bank1.year=5.216;
  double interest1=bank1.computerInterest();
  BankOfDalian bank2=new BankOfDalian();
  bank2.savedMoney=amount;
  bank2.year=5.216;
  double interest2=bank2.computerInterest();
  System.out.printf("两个银行利息相差%f元\n",interest2-interest1);
 }
}