定義一個圖形類及其子類（三角形類和矩形類），分別計算其面積和周長

//矩形類
class Rectangle {
private int width;
private int length;
public Rectangle(int width,int length) {
super();
this.width = width;
this.length = length;
}
public int getPerimeter(){
return this.width *2 + this.length *2;
}
//獲得周長
public int getArea(){
return this.width * this.length;
}
//面積
}
//三角形類
class Triangle {
private int height;
private int end;
private int left;
private int right;
public Triangle(int height, int end,int left,int right) {
super();
this.height = height;
this.end = end;
this.left = left;
this.right = right;
}
public int getPerimeter(){
return this.end+this.left+this.right;
}
//獲得周長
public int getArea(){
return (this.end * this.height)/2;
}
//面積

}


public class Figure {
public static void main(String[] args) {
Rectangle rec = new Rectangle(12,14);
Triangle tri = new Triangle(8, 10, 9, 11);
System.out.println("矩形的面積是："+rec.getArea());
System.out.println("矩形的周長是："+rec.getPerimeter());
System.out.println("三角形的面積是："+tri.getArea());
System.out.println("三角形的周長是："+tri.getPerimeter());
}


}