Use one ActionListener to handle event from multiple buttons - Java Swing

Java examples for Swing:JButton

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Description

Use one ActionListener to handle event from multiple buttons

Demo Code

     //from w ww . j a  v a 2s .c om
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

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

public class Main extends JFrame implements ActionListener {
  int index = 0;
  String[] msgs = { "test", "a", "b", "c", "d", "e", "f", };
  JButton button1 = new JButton("<<");
  JButton button2 = new JButton(">>");
  JButton button3 = new JButton(msgs[0]);

  public Main() {
    BorderLayout layout = new BorderLayout();
    setLayout(layout);
    button1.addActionListener(this);
    button2.addActionListener(this);
    button3.setEnabled(false);
    add(button1, BorderLayout.WEST);
    add(button2, BorderLayout.EAST);
    add(button3, BorderLayout.CENTER);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setSize(300, 100);
    setVisible(true);
  }

  @Override
  public void actionPerformed(ActionEvent e) {
    Object obj = e.getSource();
    if (obj == button1) {
      index--;
    } else if (obj == button2) {
      index++;
    }
    if (index > 2)
      index = 0;
    else if (index < 0) {
      index = 2;
    }
    button3.setText(msgs[index]);
  }

  public static void main(String[] args) {
    Main app = new Main();

  }

}

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