Demonstrating the ActionListener
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class ActionTest {
public static void main(String args[]) {
JFrame frame = new JFrame();
Container contentPane = frame.getContentPane();
ActionListener listener = new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.out.println("Command: " + e.getActionCommand());
System.out.println("Modifiers: ");
int modifiers = e.getModifiers();
System.out.println("\tALT : "
+ checkMod(modifiers, ActionEvent.ALT_MASK));
System.out.println("\tCTRL : "
+ checkMod(modifiers, ActionEvent.CTRL_MASK));
System.out.println("\tMETA : "
+ checkMod(modifiers, ActionEvent.META_MASK));
System.out.println("\tSHIFT: "
+ checkMod(modifiers, ActionEvent.SHIFT_MASK));
Object source = e.getSource();
if (source instanceof JComboBox) {
JComboBox jb = (JComboBox) source;
System.out.println("Combo: " + jb.getSelectedItem());
}
}
private boolean checkMod(int modifiers, int mask) {
return ((modifiers & mask) == mask);
}
};
String flavors[] = { "Item 1", "Item 2", "Item 3"};
JComboBox jc = new JComboBox(flavors);
jc.setMaximumRowCount(4);
jc.setEditable(true);
jc.addActionListener(listener);
contentPane.add(jc, BorderLayout.NORTH);
JButton b = new JButton("Button!");
b.addActionListener(listener);
contentPane.add(b, BorderLayout.CENTER);
JPanel panel = new JPanel();
JLabel label = new JLabel("Label 1: ");
JTextField text = new JTextField("Type your text", 15);
text.addActionListener(listener);
label.setDisplayedMnemonic(KeyEvent.VK_1);
label.setLabelFor(text);
panel.add(label);
panel.add(text);
contentPane.add(panel, BorderLayout.SOUTH);
frame.pack();
frame.show();
}
}
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