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Thread: can we use the Action Listener in a awt without using constructors? clarify the following error?

  1. #1
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    Default can we use the Action Listener in a awt without using constructors? clarify the following error?

    ClickMe2.java:21: non-static variable button1 cannot be referenced from a static context
    button1 = new JButton("Click Me!");
    ^
    ClickMe2.java:22: non-static variable cl cannot be referenced from a static context
    button1.addActionListener(cl);
    ^
    ClickMe2.java:22: non-static variable button1 cannot be referenced from a static context
    button1.addActionListener(cl);
    ^
    ClickMe2.java:23: non-static variable button1 cannot be referenced from a static context
    panel1.add(button1);
    ^
    4 errors

    Code:

    import javax.swing.*;
    import java.awt.event.ActionListener;
    import java.awt.event.ActionEvent;
    public class ClickMe2
    {
    	public static void main(String [] args)
    	{
    	new ClickMe2();
    	}
    	private JButton button1;
    	public ClickMe2()
    	{
    		JFrame f=new JFrame();
    		f.setSize(200,100);
    		f.setDefaultCloseOperation(
    		JFrame.EXIT_ON_CLOSE);
    		f.setTitle("I’m Listening");
    		ClickListener cl = new ClickListener(); 
    		JPanel panel1 = new JPanel(); 
    		button1 = new JButton("Click Me!"); 
    		    button1.addActionListener(cl); 
    		    panel1.add(button1); 
    		    f.add(panel1); 
    		f.setVisible(true);
    	}
     class ClickListener
    implements ActionListener
    {
    	private int clickCount = 0;
    	public void actionPerformed(ActionEvent e)
    	{
    		if (e.getSource() == button1)
    		{
    		clickCount++;
    		if (clickCount == 1)
    		button1.setText("I’ve been clicked!");
    		else
    		button1.setText("I’ve been clicked "
    		+ clickCount + " times!");
    	}
    }
    }
    }
    Last edited by jps; September 5th, 2013 at 01:54 AM. Reason: code tags


  2. #2
    Super Moderator jps's Avatar
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    Default Re: can we use the Action Listener in a awt without using constructors? clarify the following error?

    Welcome to the forum
    See the Announcements page for the use of code tags.

    "non-static variable button1 cannot be referenced from a static context"
    I see no such problem in the code as posted

  3. #3
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    Default Re: can we use the Action Listener in a awt without using constructors? clarify the following error?

    Hello.
    Are you sure you compiled the above code which you have posted?
    Or did you post the different code by mistake?

    Syed.

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