Slider(JSlider, JLabel)
1. event listener using anonymous class
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
// SliderFrame1 shows event listener using anonymous class
public class SliderFrame1 extends JFrame {
JPanel panel = new JPanel(new BorderLayout());
JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 100, 20);
JLabel label = new JLabel("Value : ", JLabel.CENTER);
public SliderFrame1(String name) {
super(name);
this.add(panel);
this.panel.add(slider, BorderLayout.CENTER);
this.panel.add(label, BorderLayout.SOUTH);
// using anonymous class
this.slider.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
JSlider s = (JSlider)e.getSource();
label.setText("Value : " + s.getValue());
}
});
this.setSize(250, 150);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new SliderFrame1("SliderTest1");
}
}
2. event listener using interface implements
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
// using implements ChangeListener
public class SliderFrame2 extends JFrame implements ChangeListener {
JPanel panel = new JPanel(new BorderLayout());
JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 100, 20);
JLabel label = new JLabel("Value : ", JLabel.CENTER);
public SliderFrame2(String name) {
super(name);
this.add(panel);
this.panel.add(slider, BorderLayout.CENTER);
this.panel.add(label, BorderLayout.SOUTH);
this.slider.addChangeListener(this); // implements ChangeListener
this.setSize(250, 150);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new SliderFrame2("SliderTest2");
}
@Override
public void stateChanged(ChangeEvent e) {
JSlider s = (JSlider)e.getSource();
label.setText("Value : " + s.getValue());
}
}
3. event listener using private inner class
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
public class SliderFrame3 extends JFrame {
JPanel panel = new JPanel(new BorderLayout());
JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 100, 20);
JLabel label = new JLabel("Value : ", JLabel.CENTER);
// using private inner class
private class SliderChangeListener implements ChangeListener {
@Override
public void stateChanged(ChangeEvent e) {
JSlider s = (JSlider)e.getSource();
label.setText("Value : " + s.getValue());
}
}
public SliderFrame3(String name) {
super(name);
this.add(panel);
this.panel.add(slider, BorderLayout.CENTER);
this.panel.add(label, BorderLayout.SOUTH);
this.slider.addChangeListener(new SliderChangeListener()); // private class
this.setSize(250, 150);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new SliderFrame3("SliderTest3");
}
}
4. event listener using outer class
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
// using private inner class
class SliderChangeListener implements ChangeListener {
JLabel label = null;
public SliderChangeListener(JLabel label) {
this.label = label;
}
@Override
public void stateChanged(ChangeEvent e) {
JSlider s = (JSlider)e.getSource();
label.setText("Value : " + s.getValue());
}
}
public class SliderFrame4 extends JFrame {
JPanel panel = new JPanel(new BorderLayout());
JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 100, 20);
JLabel label = new JLabel("Value : ", JLabel.CENTER);
public SliderFrame4(String name) {
super(name);
this.add(panel);
this.panel.add(slider, BorderLayout.CENTER);
this.panel.add(label, BorderLayout.SOUTH);
this.slider.addChangeListener(new SliderChangeListener(this.label)); // outer class
this.setSize(250, 150);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new SliderFrame4("SliderTest4");
}
}
5. event listener using lambda
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
// SliderFrame5 shows event listener using lambda
public class SliderFrame5 extends JFrame {
JPanel panel = new JPanel(new BorderLayout());
JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 100, 20);
JLabel label = new JLabel("Value : ", JLabel.CENTER);
public SliderFrame5(String name) {
super(name);
this.add(panel);
this.panel.add(slider, BorderLayout.CENTER);
this.panel.add(label, BorderLayout.SOUTH);
// using lambda
this.slider.addChangeListener(e -> { // lambda
JSlider s = (JSlider)e.getSource();
label.setText("Value : " + s.getValue());
});
this.setSize(250, 150);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new SliderFrame5("SliderTest5");
}
}
