Command Behavioral Design Pattern

Command is most commonly used behavioral design pattern. In this, object is used to represent and encapsulate all the information needed to call a method at a later time.

Implementation:

Command.java:

public interface Command {

      public abstract void execute();

}

RecieverOne.java:

public class RecieverOne implements Command {

      @Override

      public void execute() {

            System.out.println("I am Reciever One.");

      }

}

RecieverTwo.java:

public class RecieverTwo implements Command {

      @Override

      public void execute() {

            System.out.println("I am Reciever Two.");

      }

}

Invoker.java:

public class Invoker {

      public void execute(Command cmd){

            cmd.execute();

      }

}

Client.java:

public class Client {

      public static void main(String[] args) {

            Command cmd1 = new RecieverOne();

            Command cmd2 = new RecieverTwo();

            Invoker invoker = new Invoker();

            invoker.execute(cmd1);

            invoker.execute(cmd2);

      }

}