共回答了15个问题采纳率：93.3%

1.shape接口：

public interface Shape {

double getArea();

}

2.shape2D接口：

public interface Shape2D extends Shape {

double getCircumference();

}

shape3D接口：

public interface Shape3D extends Shape {

double getVolume();

}

3.Circle类：

public class Circle implements Shape2D {

public Circle(double radius){

this.setRadius(radius);

}

@Override

public double getCircumference() {

return 2*Math.PI*radius;

}

@Override

public double getArea() {

return Math.PI*radius*radius;

}

public void setRadius(double radius) {

this.radius = radius;

}

public double getRadius() {

return radius;

}

private double radius;

}

4.Square类：

public class Square implements Shape3D {

public Square(int length,int width,int height){

this.setHeight(height);

this.setLength(length);

this.setWidth(width);

}

@Override

public double getVolume() {

return length*width*height;

}

@Override

public double getArea() {

return 2*length*width+2*width*height+2*length*height;

}

public int getLength() {

return length;

}

public void setLength(int length) {

this.length = length;

}

public int getWidth() {

return width;

}

public void setWidth(int width) {

this.width = width;

}

public int getHeight() {

return height;

}

public void setHeight(int height) {

this.height = height;

}

private int length;

private int width;

private int height;

}

5.Scaleable接口:

public interface Scableable {

void scale(double propertion);

}

6.CircleScaleable类：

public class CircleScaleable extends Circle implements Scableable {

public CircleScaleable(int radius) {

super(radius);

}

@Override

public void scale(double propertion) {

super.setRadius(super.getRadius()*propertion);

}

}

7.CircleScaleable测试程序：

public class CircleScaleableTest {

public static void main(String[] args){

CircleScaleable circle=new CircleScaleable(100);

printShape2D(circle);

circle.scale(0.5);

printShape2D(circle);

circle.scale(2.5);

printShape2D(circle);

}

public static void printShape2D(Shape2D shape){

System.out.println("##############n");

System.out.println("Circumference:"+shape.getCircumference());

System.out.println("Area:"+shape.getArea()+"n");

}

}

1年前

8