java设计图形(Shape)类及其子类(Circle、Rectangle)
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发布时间：2022-05-27 10:06
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时间：2023-10-16 08:34
Shape类：
public class Shape {
protected Point location;
public Shape(){
}
public double area(){
return 0.0;
}
}
Circle类：
public class Circle extends Shape{
private int r;
public Circle() {
}
public Circle(Point center,int r) {
super.location=center;
this.r = r;
}
public double area() {
return Math.PI*r*r ;
}
}
Rectangle类：
public class Rectangle extends Shape{
private int width;
private int height;
public Rectangle() {
}
public Rectangle(Point o,int width, int height) {
location=o;
this.width = width;
this.height = height;
}
public double area() {
return width*height;
}
}
我这里图方便，在创建圆的时候直接用圆心和半径创建，还有矩形也是用一个点位置和长宽创建，所以还要加一个点类：
public class Point {
public int x;
public int y;
public Point() {
}
public Point(int x, int y) {
this.x = x;
this.y = y;
}
}
