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How can we implement a JToggleButton in Java?
JToggleButton
- A JToggleButton is an extension of AbstractButton and it can be used to represent buttons that can be toggled ON and OFF.
- When JToggleButton is pressed for the first time, it remains pressed and it can be released only when it is pressed for the second time.
- A JToggleButton generates an ActionEvent each time it is pressed.
- A JToggleButton can also generate an ItemEvent, this event is used by those components that support the concept of selection. When a JToggleButton is pressed in, it is selected. When it is popped out, it is deselected.
- To handle item events, you must implement the ItemListener interface. This interface defines the itemStateChanged( ) method that is invoked when the state of an item changes. A toggle button’s state is by calling the isSelected( ) method on the button that generated the event.
Example
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class JToggleButtonTest extends JFrame implements ItemListener {
private JToggleButton jtb;
JToggleButtonTest() {
setTitle("JToggleButton Test");
setLayout(new FlowLayout());
setJToggleButton();
setAction();
setSize(450, 300);
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
private void setJToggleButton() {
jtb = new JToggleButton("ON");
add(jtb);
}
private void setAction() {
jtb.addItemListener(this);
}
public void itemStateChanged(ItemEvent eve) {
if(jtb.isSelected())
jtb.setText("OFF");
else
jtb.setText("ON");
}
}
public class MainApp {
public static void main(String[] args) {
new JToggleButtonTest();
}
}Output
Updated on: 07-Feb-2020
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