Need help with Java Testing Interfaces

Hi,

I have been working for about 3 hours on this peice of code but I still cant get it to test properly. Basically I have made a mobile device that connects to other devices and allows them to send messages. I need to test a Mobile class to see if I can test a connection (basically to see if there is a connection and if so display the receiving message)

I have an interface called Greenfang which allows the object orientated objects to talk to each other

heres my mobile code

/**
public class Mobile {
	
	private String imac;
	private GreenFang connection;
	private boolean paired;
	
	/**
	 *Create a Mobile of the type passed in as a String
	 */
	public Mobile(String type){
		this.imac = imac;
		paired = false;
		
	}
	
	/**
	 * Pass in the device that you wish connect to.  The device must implement
	 *the GreenFang interface
	 */
	public void connect (GreenFang greenFangConnection){
		if(greenFangConnection != null ){
			connection = greenFangConnection;
			paired = true;
			
		}
	}
	
	/**
	 *Disconnect an existing connection.  Only successful if already connected 
	 *to the GreenFang passed in
	 */
	public void disconnect(GreenFang greenFangConnection){
		if (connection == greenFangConnection){
			connection = null;
			paired = false;
		}
		else{
			System.out.println("Can't disconnect - not connected in the first place");
		}
	}
	
	/**
	 *Call this method when connected to a GreenFang device to pass your message
	 */
	public void sendGreenFangMessage(String message){
		if (paired){
			connection.receiveMessage("Message from "+imac+":"+message);
		}
		else{
			System.out.println("No GreenFang connection present");
		}
	}
	
	
	
}

heres my GreenFang code

/**
 *Devices implementing this interface can communicate
 */
 
public interface GreenFang{
	/**
	 *receives a message as String
	 */
	public void receiveMessage(String information);
	
	
	
}

and heres my Tester which I have not yet completed

public abstract class MobileTest implements GreenFang {

    public static void main(String[] args) {
    	
    Mobile receiveMessage1 = new Mobile();
        
    String answer = receiveMessage1.sendGreenFangMessage();
        
    System.out.println(answer);
    }
    }

I don't know where I am going wrong, does my tester being abstract have anything to do with the problem as I have changed it, still not working

Reply 1

coldplasma

What about it is not working? All I see is that you are calling sendGreenFangMessage() that takes String as a parameter but you haven't provided a parameter. It would help enormously if I knew what the problem actually is.