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Thread: keyPressed method not working?

  1. #1
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    Default keyPressed method not working?

    Hi, I have this code:

    public void keyPressed(KeyEvent e){
     
    			int keyCode = e.getKeyCode();
    			if (keyCode == KeyEvent.VK_ESCAPE){
     
    				System.exit(0);
     
    			}
     
    		}

    But I am getting "illegal start of expression" and "';' expected" errors, I guess I am doing something wrong?

    I have implemented the KeyListener class.


  2. #2
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    Default Re: keyPressed method not working?

    You're going to have to supply an SSCCE that demonstrates the error- it could be that the source of your problem is in another piece of code (probably a missing bracket or parenthesis). Boil it down to as small a piece of code that still exhibits that behavior, and we'll go from there.
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    Default Re: keyPressed method not working?

    This is my code, it is only small:

    import java.awt.*;
    import javax.swing.*; 
    import java.awt.event.*;
     
    class MoveIcon implements KeyListener{
     
    	public static void main(String[]args){
    		//create window
    		JFrame frame = new JFrame("Moving Icon App");
    		frame.setSize(600,400);
    		frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
     
    		JPanel background = new JPanel();
    		background.setOpaque(true);
     
    		frame.setContentPane(background);
    		frame.setLayout(null);
     
    		ImageIcon icon = new ImageIcon("dot.jpg");
     
     
    		JLabel label = new JLabel(icon);
    		label.setSize(label.getPreferredSize());
    		label.setLocation(100,50);
     
     
    		Container windowsContentPane = frame.getContentPane();
     
    		windowsContentPane.add(label);
     
     
    		frame.setVisible(true);
     
    		public void keyPressed(KeyEvent e){
     
    			int keyCode = e.getKeyCode();
    			if (keyCode == KeyEvent.VK_ESCAPE){
     
    				System.exit(0);
     
    			}
     
    		}
     
     
     
     
    	}
     
     
     
     
     
    }

    Thanks

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    Default Re: keyPressed method not working?

    Ah, I see. Your keyPressed() method seems to be inside your main() method, which is not allowed. You could have an anonymous inner class, but I don't think that's what you're going for, since you implemented KeyListener.
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    Default Re: keyPressed method not working?

    Ah thank you, ive now got it to compile but it doesnt work.

    I have to defined all of the methods of the KeyListener interface. I have removed the "if (keyCode == KeyEvent.VK_ESCAPE){" and just put in "System.out.print("hi");", I also tried "System.exit(0);", but nothing happens. Ideas?

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    Default Re: keyPressed method not working?

    When do you add the KeyListener? Recommended reading: How to Write a Key Listener (The Java™ Tutorials > Creating a GUI With JFC/Swing > Writing Event Listeners)
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