第十周定义一个图形类及其子类（三角形类和矩形类），分别计算其面积和周长。

//定义一个图形类及其子类（三角形类和矩形类），分别计算其面积和周长。

package JAVA;

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;
}//获得周长
public int getArea(){
return this.width * this.length;
}//面积

}//三角形类

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;
}//获得周长
public int getArea(){
return (this.end * this.height)/2;
}//面积

}

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

}