75 lines
1.7 KiB
Java
75 lines
1.7 KiB
Java
package exp4;
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abstract class Shapes {
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public int x,y; //x，y为的坐标
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public int width,height;
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public Shapes(int x,int y,int width,int height) {
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this.x = x;
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this.y = y;
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this.width = width;
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this.height = height;
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}
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public abstract double getArea();
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public abstract double getPerimeter();
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public abstract void show();
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}
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class Rectangle extends Shapes{
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double a;
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double b;
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Rectangle(double a, double b){
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super(0, 0, 0, 0);
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this.a=a;
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this.b=b;
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}
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public double getArea(){
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return a*b;
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}
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public double getPerimeter(){
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return (a+b)*2;
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}
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public void show(){
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System.out.println("矩形 长:"+this.a+"宽:"+this.b);
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}
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}
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class Circle extends Shapes{
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double radius;//半径
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Circle(double radius){
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super(0, 0, 0, 0);
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this.radius=radius;
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}
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public double getArea(){
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return 3.14159265324*radius*radius;
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}
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public double getPerimeter(){
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return 3.14159265324*radius*2;
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}
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public void show(){
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System.out.println("圆 半径:"+this.radius);
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}
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}
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public class ShapeDemo {
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public static void main(String[] args){
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Shapes r = new Rectangle(2, 3);
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Shapes c = new Circle(5);
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r.show();
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System.out.println("面积:"+r.getArea()+" 周长:"+r.getPerimeter()+"\n");
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c.show();
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System.out.println("面积:"+c.getArea()+" 周长:"+c.getPerimeter()+"\n");
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}
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}
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