abstract class Handler {
  protected Handler successor;

  public void setSuccessor(Handler successor) {
    this.successor = successor;
  }

  abstract public void handleRequest(int request);
}

public class ConcreteHandler1 extends Handler{
  public void handleRequest(int request) {
    if (request >= 0) {
      System.out.println("ConcreteHnadler1 handle request " + request);
    }
    if (successor!=null) {
      successor.handleRequest(request);
    }
  }
}

public class ConcreteHandler2 extends Handler {
  public void handleRequest(int request) {
    if (request < 100) {
      System.out.println("ConcreteHnadler2 handle request " + request);
    }
    if (successor!=null) {
      successor.handleRequest(request);
    }
  }
}

public class ConcreteHandler3 extends Handler {
  public void handleRequest(int request) {
    if (request % 2 == 0) {
      System.out.println("ConcreteHnadler3 handle request " + request);
    }
    if (successor!=null) {
      successor.handleRequest(request);
    }
  }
}

public class Client {
  public static void main(String[] args) {
    Handler h1 = new ConcreteHandler1();
    Handler h2 = new ConcreteHandler2();
    Handler h3 = new ConcreteHandler3();

    h1.setSuccessor(h2);
    h2.setSuccessor(h3);

    h1.handleRequest(2);
    h1.handleRequest(3);
    h1.handleRequest(105);
  }
}

C:\JavaHello\Chain of Responsibility>java Client
ConcreteHnadler1 handle request 2
ConcreteHnadler2 handle request 2
ConcreteHnadler3 handle request 2
ConcreteHnadler1 handle request 105
ConcreteHnadler1 handle request 3
ConcreteHnadler2 handle request 3

C:\JavaHello\Chain of Responsibility>