Bài tập lập trình hướng đối tượng java Số 9 (Chữa bài kiểm tra học kỳ )

//Họ tên: Trần Văn Linh
//Msv:581597
//Lớp:K58QLTT

Đề 03;

public class Circle

{

    private double radius;

    private String color;

   

    public Circle()

    {

        this.radius=1.0;

    }

    public Circle(double radius)

    {

        this.radius=radius;

    }

    public double getRadius()

    {

        return this.radius;

    }

     public double getArea()

    {

        return Math.PI*this.radius*this.radius;

    }

}

 //----------------------------------------------------

public class Cylinder extends Circle

{

    private double height;

    //contructor

    public Cylinder()

    {

        this.height=1.0;

    }

    public Cylinder(double radius)

    {

         super(radius);

         this.height=1.0;

    }

    public Cylinder(double radius,double height)

    {

         super(radius);

         this.height=height;

    }

   

    public double getHeight()

    {

        return this.height;

    }

    //ham tinh the tich

    public double getVolume()

    {

        return super.getArea()*this.height;

    }

    //overide equals

    public boolean equals(Object obj)

    {

        Cylinder tg=(Cylinder)obj;

        if(this.getRadius()==tg.getRadius()&&this.height==tg.getHeight())

        {

            return true;

        }

        return false;

    }

}

 //---------------------------------------------------------

public class Test

{

   public static void main(String[] args)

   {

      //su dung ham tao Cylinder();

       Cylinder ht1=new Cylinder();

       System.out.println("Ban kinh :"+ht1.getRadius());

       System.out.println("Chieu cao: "+ht1.getHeight());

       System.out.println("Dien tich mot mat: "+ht1.getArea());

       System.out.println("The tich: "+ht1.getVolume());

      

       //su dung ham tao Cylinder(5.0,2.0);

       Cylinder ht2=new Cylinder(5.0,2.0);

       System.out.println("Ban kinh :"+ht2.getRadius());

       System.out.println("Chieu cao: "+ht2.getHeight());

       System.out.println("Dien tich mot mat: "+ht2.getArea());

       System.out.println("The tich: "+ht2.getVolume());

   }

}