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Java Swing ComboBox Example
package net.sourcecodeexamples.swingexample.components2;
import javax.swing.GroupLayout;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import java.awt.EventQueue;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import static javax.swing.GroupLayout.Alignment.BASELINE;
public class ComboBoxExample extends JFrame
implements ItemListener {
private static final long serialVersionUID = 1L;
private JLabel display;
private JComboBox < String > box;
private String[] distros;
private void initializeUI() {
distros = new String[] {
"Ubuntu",
"Redhat",
"Arch",
"Debian",
"Mint"
};
box = new JComboBox < > (distros);
box.addItemListener(this);
display = new JLabel("Ubuntu");
createLayout(box, display);
setTitle("JComboBox");
setSize(300, 200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
}
private void createLayout(JComponent...arg) {
JPanel pane = (JPanel) getContentPane();
GroupLayout gl = new GroupLayout(pane);
pane.setLayout(gl);
gl.setAutoCreateContainerGaps(true);
gl.setAutoCreateGaps(true);
gl.setHorizontalGroup(gl.createSequentialGroup()
.addComponent(arg[0])
.addComponent(arg[1])
);
gl.setVerticalGroup(gl.createParallelGroup(BASELINE)
.addComponent(arg[0])
.addComponent(arg[1])
);
pack();
}
@Override
public void itemStateChanged(ItemEvent e) {
if (e.getStateChange() == ItemEvent.SELECTED) {
display.setText(e.getItem().toString());
}
}
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
ComboBoxExample comboBoxExample = new ComboBoxExample();
comboBoxExample.initializeUI();
comboBoxExample.setVisible(true);
});
}
}
The display area is a simple JLabel. It displays the item that is initially shown in the combo box:
```java
display = new JLabel("Ubuntu");
box = new JComboBox<>(distros);
box.addItemListener(this);
gl.setVerticalGroup(gl.createParallelGroup(BASELINE)
.addComponent(arg[0])
.addComponent(arg[1])
);
@Override
public void itemStateChanged(ItemEvent e) {
if (e.getStateChange() == ItemEvent.SELECTED) {
display.setText(e.getItem().toString());
}
}
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