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Thread: help with abstract and nonabstract action listner

  1. #1
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    Default help with abstract and nonabstract action listner

    import javax.swing.JFrame;
    import java.awt.FlowLayout;
    import java.awt.Color;
    import javafx.event.ActionEvent;
    import java.awt.event.ActionListener;
    import javax.swing.JButton;
    import javax.swing.JLabel;
    import javax.swing.JPanel;
     
    public class FrameAndButton extends JFrame implements ActionListener {
     
        public static void main(String args[]) {
           FrameAndButton fnb = new FrameAndButton();
            fnb.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            fnb.setSize(500, 300);
            fnb.setResizable(false);
            fnb.setTitle("Frame and Button");
            fnb.getContentPane().setBackground(Color.white);
            fnb.setLocationRelativeTo(null);//to put the frame in the middle of the window,before setvislible()
            fnb.getContentPane().setLayout(new FlowLayout());//wont overlap the button to whole frame
            JButton btn = new JButton();
            btn.setBackground(Color.white);
            btn.setText("Java Code trying");
            fnb.add(btn);
            fnb.setVisible(true);
            btn.addActionListener(this);
        }
    //buttonAction();
     
        public FrameAndButton() {
            constructFrame();
        }//FrameAndButton constructor
     
        public final void constructFrame() {
     
     
        }
                public void actionPerformed(ActionEvent e) {
                    JFrame frame2 = new JFrame("Your Stocks");
                    frame2.setVisible(true);
                    frame2.setSize(600, 600);
                    JLabel label = new JLabel("Your Personal Stocks");
                    JPanel panel = new JPanel();
                    frame2.add(panel);
                    panel.add(label);
                }
     
    //fnb.pack();// autometically addjest the frame size put it at last after adding all butns etc..
        // constructFrame method
    }

    Dear people can you please help me with this code keeps telling me
    non abstract method cannot be override by the abstract method.
    but i think am doing it right way of course its wrong.

  2. #2
    Super Moderator pbrockway2's Avatar
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    Default Re: help with abstract and nonabstract action listner

    The error message I see when I attempt to compile your code is

    FrameAndButton.java:10: error: FrameAndButton is not abstract and does not override abstract method actionPerformed(ActionEvent) in ActionListener
    public class FrameAndButton extends JFrame implements ActionListener {
           ^

    (Note: it is always a good idea to copy and post the exact compiler message as you see it. That way everyone knows exactly what is happening and can, most easily, explain it).

    The problem here is that the FrameAndButton class is declared as implementing the ActionListener interface, but it does not define an actionPerformed(ActionEvent) method. I know you have a method of that name ... but it is using the wrong sort of ActionEvent.

    It turns out there are more than one class of that name in Java. Check the ActionListener documentation to see what ActionEvent you should be using. You can do that by clicking on (or hovering over) "ActionEvent" where it is mentioned in the "Method detail" section. Then make sure you are importing the correct ActionEvent class.

  3. #3
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    Default Re: help with abstract and nonabstract action listner

    thanks for correcting me and compiling it.
    can anyone please correct the error.

  4. #4
    Super Moderator pbrockway2's Avatar
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    Default Re: help with abstract and nonabstract action listner

    Did you check the ActionListener documentation? And, if so, were you able to locate the full name of ActionEvent class (including the package of which it's part)?

  5. #5
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    Default Re: help with abstract and nonabstract action listner

    be honest with you i did not get that that that is too mcuh for me am new to java but i will keep trying it. it will be great if you just fix my code this time thats all my code is.

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