The sixth week course and test report summary

I. Purpose

Inheritance (1) master class

Inheritance Inheritance and a cover (2) variables, methods, and to achieve coverage of overloading;

II. Content Experiment

(1) Circularity Circle class according to the following requirements.

1. Circle class member variable circular: radius represents the radius of the circle.

2. The members of the circle method of class Circle:

   Circle():构造方法，将半径置0

   Circle(double r)：构造方法，创建Circle对象时将半径初始化为r

   double getRadius（）：获得圆的半径值

   double getPerimeter（）：获得圆的周长

   void disp（）：将圆的半径和圆的周长，圆的面积输出到屏幕

(2) round the Circle class inherits the first question in the derived class cylinder Cylinder. Requirements are as follows:

1. Cylinder cylinder class member variables: height represents the height of the cylinder.

2. Cylinder cylinder class member methods:

    Cylinder（double r,double h）构造方法，创建Cylinder对象时将圆半径初始化为r，圆柱体高初始化为h。

    double getHeight（）：获得圆柱体的高

    double getVol（):获得圆柱体的体积

    void dispVol（）：将圆柱体的体积输出到屏幕

Cylinder 3. The second class of problem, connected to the keyboard input as a high value and the radius of a circle of the cylinder, the calculated cylinder volume
1)

package text5;

public class Circle {
    private double radius;

    public double getRadius() {
        return radius;
    }

    public void setRadius(double radius) {
        this.radius = radius;
    }

    public Circle() {
        this.radius=0;
    }
    
    public Circle(double radius) {
        this.radius = radius;
    }

    public double getPerimeter() {
        double perimeter=2*radius*3.1415926;
        return perimeter;
    }
    
    public double getArea() {
        double area=radius*radius*3.1415926;
        return area;
    }
    
    public void disp() {
        System.out.println("半径："+radius);
        System.out.println("周长："+getPerimeter());
        System.out.println("面积："+getArea());
    }
}

package text5;

public class Cylinder extends Circle{
    
    private double height;

    public double getHeight() {
        return height;
    }

    public void setHeight(double height) {
        this.height = height;
    }

    public Cylinder(double radius, double height) {
        super(radius);
        this.height = height;
    }
    
    public double getVol() {
        double vol=super.getArea()*height;
        return vol;
    }
    
    public void disp() {
        super.disp();
        System.out.println("体积："+getVol());
    }
}

package text5;

public class Text5 {

    public static void main(String[] args) {
        Cylinder cyl1=new Cylinder(5,7);
        cyl1.disp();

    }

}

2) Run Screenshot

Lessons Learned

This put the National Day holiday week, mainly familiar with some general knowledge of last week's learning, such as:
subclass inherits the parent class