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Thread: Return statements while building a JPanel!

  1. #1
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    Default Return statements while building a JPanel!

    Hello, i'm having this where i'm trying to return a JPanel with tempPictures but only if they aren't already filled with "actual" pictures. However this causes problems because your never shore that the if statement will execute. I tried adding an else statement but i cant return null i must return a JPanel;

    	private JPanel buildTopShelf() {
    		if(myMediaHandler.mediaList.size() < 6) {
    		JPanel mediaPanel = new JPanel();
    		mediaPanel.setOpaque(false);
    		mediaPanel.setLayout(new GridLayout(1,6,22,0));
    		mediaPanel.setBounds(90, 14, 1020, 210);
     
    		java.net.URL where;
    		try {
    			where = new URL("https://dl.dropboxusercontent.com/u/16670644/Projekt/TempPic.png");
    			ImageIcon image = new ImageIcon(where);
    			for(int i = myMediaHandler.mediaList.size(); i < 6; i++) {
    				JLabel imageLabel = new JLabel(image);
    				mediaPanel.add(imageLabel);
    			}
     
    		} catch (MalformedURLException e) {
    			// TODO Auto-generated catch block
    			System.out.println("Error loading TempPic that shows allowed movie spots");
    			e.printStackTrace();
    		}
    		return mediaPanel;
    	}
    		else {
    			return null;
    		}
    	}


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Return statements while building a JPanel!

    trying to return a JPanel with tempPictures but only if they aren't already filled
    Then the caller of the method should test for the returned null value to know that the panel is filled.

    Not sure about this design.
    Should the method define and fill a panel with images and return that newly filled panel.
    Or The caller could test if the panel is full before calling the method and not call the method if the panel is full.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Return statements while building a JPanel!

    It turned out to be an error with the size(); from the ArrayList. Ones i fixed that and changed return null; to return mediaPanel; it worked the way i wanted.

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