CODEWITHSUNDEEP
javaswingjbuttonactionlistener
ob103ninja
ob103ninja

Reputation: 3

addActionListener not working

I followed a tutorial on how to do this - Here's the code I used:

package soundboard;
import javax.swing.*;
import java.awt.event.*;

public class Soundboard {

    JButton Button1;

    public void windowCreate() {
        JFrame frame = new JFrame();
        mainsPanel = new JPanel();

        Button1 = new JButton("1");
        Button1.addActionListener(this);

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setResizable(false);
        frame.add(Button1);
        frame.add(mainsPanel);

        frame.setSize(183,245);
        frame.setVisible(true);
        frame.setLocationRelativeTo(null);
    }

    public void actionPerformed(ActionEvent event){
    }

    public static void main(String[] args){
    Soundboard window = new Soundboard();
    window.windowCreate();
    }
}

The code seems to not be working. Could anyone explain why?

The JPanel is used as a background. The problem is in Button1.addActionListener(this); , as it says that "this" is not convertible to ActionListener or something like so.

Upvotes: 0

Views: 4669

Answers (4)

ob103ninja
ob103ninja

Reputation: 3

I got it working. Here's how I implemented it, the other buttons don't do a thing quite yet. All the code is in a class called Soundboard, which implements ActionListener, while javax.swing* and java.awt.event* are also imported.

JButton loadButton;
JButton clearButton;
JButton Button1;
JButton Button2;
JButton Button3;
JButton Button4;
JPanel mainsPanel;
int times;

public void windowCreate() {


    JFrame frame = new JFrame();
    mainsPanel = new JPanel();


    loadButton = new JButton("Load...");
    loadButton.setSize(80, 30);
    loadButton.setLocation(4, 4);

    clearButton = new JButton("Clear");
    clearButton.setSize(80, 30);
    clearButton.setLocation(92, 4);


    Button1 = new JButton("1");
    Button1.setSize(80, 80);
    Button1.setLocation(4, 45);
    Button2 = new JButton("2");
    Button2.setSize(80, 80);
    Button2.setLocation(92, 45);
    Button3 = new JButton("3");
    Button3.setSize(80, 80);
    Button3.setLocation(4, 133);
    Button4 = new JButton("4");
    Button4.setSize(80, 80);
    Button4.setLocation(92, 133);

    loadButton.addActionListener(this);

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setResizable(false);

    frame.add(loadButton);
    frame.add(clearButton);
    frame.add(Button1);
    frame.add(Button2);
    frame.add(Button3);
    frame.add(Button4);
    frame.add(mainsPanel);

    frame.setSize(183,245);
    frame.setVisible(true);
    frame.setLocationRelativeTo(null);                
}
@Override
public void actionPerformed(ActionEvent event){
    times += 1;
    System.out.println("Test successful - this was the #"
                        + times + " press");
}

public static void main(String[] args){
    Soundboard window = new Soundboard();
    window.windowCreate();
}

Upvotes: 0

SME_Dev
SME_Dev

Reputation: 1890

If you want to add your class as an Onclicklistener:

Button1.addActionListener(this);

then your class must implement the appropriate interface ActionListener like this:

public class Soundboard implements ActionListener{
    //...

    @Override
    public void actionPerformed(ActionEvent e){
    //...
    }
}

EDIT

If you have multiple buttons, that need separated implementation, you could f.e. use anonymous classes:

mybutton.addActionListener(new ActionListener(){

    @Override
    public void actionPerformed(ActionEvent e){
         //does something, that probably interests only mybutton
         //declare mybutton as **final** if you must use it
    }
});

Upvotes: 4

Uwe Plonus
Uwe Plonus

Reputation: 9954

You can only add ActionListeners to a Component with addActionListener().

Your class has to implement ActionListener e.g.

public class Soundboard implements ActionListener {

Upvotes: 3

TNT
TNT

Reputation: 2920

You need to implement the ActionListener interface if you want to override the actionPerformed method:

public class Soundboard implements ActionListener {

Upvotes: 4

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