public interface Sports

{

  public void setHomeTeam(String name);

  public void setVisitingTeam(String name);

}

Create two classes Hockey and football. Both classes must implement the interface Sports.

public interface Shape {

    public String LABLE="Shape";

    double getArea();

}

Create two classes Rectangle and Circle. Both classes must implement the interface Shape.

Answer:

Program:-1

import java.util.*;


interface Sports
{
  public void setHomeTeam(String name);


  public void setVisitingTeam(String name);


}


class Hockey implements Sports
{


	public void setHomeTeam(String name) 
	{
		System.out.println("Home Team Name: "+name);
	}


	public void setVisitingTeam(String name) 
	{
		System.out.println("Visiting Team Name: "+name);
	}
	
}


class Football implements Sports
{


	public void setHomeTeam(String name) 
	{
		System.out.println("Home Team Name: "+name);
	}




	public void setVisitingTeam(String name) 
	{
		System.out.println("Visiting Team Name: "+name);
	}
	
}
class Demo
{
	public static void main(String[] args) 
	{
		System.out.println("-------------------Hockey----------------");
		Hockey obj=new Hockey();
		obj.setHomeTeam("Flying Elbows");
		obj.setVisitingTeam("Toothless Wonders");
		
		System.out.println("\n-------------------Football----------------");
		Football obj1=new Football();
		obj1.setHomeTeam("Black Eagles");
		obj1.setVisitingTeam("Banana Slugs");
	}
}

Program:-2

import java.util.*;


interface Shape 
{   
    public String LABLE="Shape";


    double getArea();


}


class Rectangle implements Shape {


	private double width;
	private double height;
	
	public Rectangle( double h,double w){
		this.width=w;
		this.height=h;
	}


	public double getArea() {
		return this.height*this.width;
	}


}


class Circle implements Shape 
{


	private double radius;


	public Circle(double r){
		this.radius = r;
	}
	
	public double getArea()
	{
		return Math.PI*this.radius*this.radius;
	}


}




class Demo
{
	public static void main(String[] args) 
	{
		System.out.println("--------------------Rectangle------------------");
		Rectangle rect=new Rectangle(42,20);
		System.out.println("Are of Rectangle: "+rect.getArea());
		
		
		System.out.println("\n--------------------Circle--------------------");
		Circle circle=new Circle(5);
		System.out.println("Area of Circle: "+circle.getArea());
	}
}

PFA