Using an inner ActionListener class.

  

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;

public class InnerClass {

  class ButtonListener implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      System.exit(0);
    }
  }

  public InnerClass() {
    JButton close = new JButton("Close");
    ButtonListener listener = new ButtonListener();
    close.addActionListener(listener);

    JFrame f = new JFrame();
    f.add(close);

    f.setSize(300, 200);
    f.setLocationRelativeTo(null);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setVisible(true);
  }

  public static void main(String[] args) {
    new InnerClass();
  }
}

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Using an inner ActionListener class. : Event Queue « Event « Java

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