第1个回答 2014-04-21
(1)
public class TwoDShape{
private double width;
private double height;
private String name;
public TwoDShape(){}
public double getWidth(){
return width;
}
public double getHeight(){
return height;
}
public void setWidth( double width){
this.width = width;
}
public void setHeight(double height){
this.height = height;
}
public double area(){
}
}
public class Circle extends TwoDShape{
public Circle(String name) {
super(name);
}
public double area(){
double r = getWidth()/2;
return r*r*3.14;
}
}
(2)
public interface canSwim{
public void swim();
}
public interface canJump{
public void jump();
}
public class Frog implements canSwim,canJump{
@Override
public void jump() {
System.out.prinln("I can jump");
}
@Override
public void zwin() {
System.out.prinln("I can swin");
}
}