CODEWITHSUNDEEP
javaeclipseevent-handling
eager2learn
eager2learn

Reputation: 1488

ActionAdapter cannot be resolved to a type

I've started learning about event handlers and have tried to play around with some basic concepts. I have gotten a weird error in the following code. I'm using Eclipse and get the following errors on the line where I try to add an ActionListener to the Button b:

"The method addActionListener(ActionListener) in the type Button is not applicable for the type new ActionAdapter(){}"

"ActionAdapter cannot be resolved to a type"

import java.awt.*;
import java.awt.event.*;


public class Test extends Frame{

private TextField text = new TextField(20);
Button b;
private int num_clicks = 0;

public static void main(String args[]){
Test appwind = new Test("title");
appwind.setSize(300,300);
appwind.setTitle("Irrelevant");
appwind.setVisible(true);
}

public Test(String title)
{
    super(title);
    setLayout(new FlowLayout());
    addWindowListener(new WindowAdapter(){
            public void WindowClosing(WindowEvent e) {
                System.exit(0);}});
    b = new Button("Click");
    add(b);
    add(text);
    b.addActionListener(
            new ActionAdapter()
            {
                public void actionPerformed(ActionEvent e)
                {
                    num_clicks++;
                    text.setText("number of times clicked: " + num_clicks);}
            });


}
}

Upvotes: 0

Views: 3515

Answers (1)

Reimeus
Reimeus

Reputation: 159784

Adapter classes are convenience classes provided when the underlying interface has 2 or more methods. ActionListener only has one method - Use ActionListener instead

b.addActionListener(new ActionListener() {
     public void actionPerformed(ActionEvent e) {
         ...
     }
});

Upvotes: 1

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