package package2;

public abstract class Shape {

public abstract void zhouchang();

public abstract void mianji();

}

--------------------------------------------------------------------

package package2;

public class Rectangle extends Shape{

@Override

public void zhouchang() {

// TODO Auto-generated method stub

double length=10;

double wide=10;

double perimeter=(length+wide)*2;

}

@Override

public void mianji() {

// TODO Auto-generated method stub

double length=10;

double wide=10;

double area=length*wide;

}

}

----------------------------------------------

package package2;

public class Circle extends Shape{

@Override

public void zhouchang() {

// TODO Auto-generated method stub

double radius=5;

? ? final double P=3.14;

double perimeter=2*P*radius;

}

@Override

public void mianji() {

// TODO Auto-generated method stub

double radius=5;

? ? final double P=3.14;

double area=P*radius*radius;

}

}

-------------------------------------

package package2;

public class test {

? ?Shape Rec=new Rectangle();

? ?Rec.zhouchang();

? ?Rec.mianji();

? ?Shape Cir=new Circle();

? ?Cir.zhouchang();

? ?Cir.mianji();

}