作业7

//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。


class Graphical {//父类


public double width;//成员变量


public double length;


public double area;


public double Perimeter;






public double areaGraphical() {//成员方法


return area;






}






public double PerimeterGraphical() {


return Perimeter;






}


}






class rectangle extends Graphical {//子类继承父类






public double areaGraphical() {


area = width * length;


return area;


}






public double PerimeterGraphical() {


Perimeter = (width + length) * 2;


return Perimeter;






}


}






class Triangle extends Graphical {//子类继承父类


public double high;


public double bottom;


public double side;






public double areaGraphical() {


area = (bottom * high) / 2;


return area;


}






public double PerimeterGraphical() {


Perimeter = high + bottom + side;


return Perimeter;






}






}






public class ke1 {//主类






public static void main(String[] args) {


rectangle p1 = new rectangle();// 声明对象和创建对象


p1.width = 5;


p1.length = 5;


p1.areaGraphical();


p1.PerimeterGraphical();


System.out.println("矩形面积:" + p1.areaGraphical() + "矩形周长:" + p1.PerimeterGraphical());//输出


Triangle p2 = new Triangle();// 声明对象和创建对象


p2.high = 5;


p2.side = 5;


p2.bottom = 5;


p2.areaGraphical();


p2.PerimeterGraphical();


System.out.println("三角形面积:" + p2.areaGraphical() + "三角形周长:" + p2.PerimeterGraphical());//输出


// TODO 自动生成的方法存根






}






}