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| 15. 10. 1. 撰写组件监听 |
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One or more component events are fired after the component is hidden, made visible, moved, or resized. |
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import java.awt.Component;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
public class UsingComponentListener {
public static void main(String[] a) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JCheckBox checkbox = new JCheckBox("Label visible", true);
checkbox.addComponentListener(new ComponentListener() {
public void componentHidden(ComponentEvent e) {
System.out.println("componentHidden event from " + e.getComponent().getClass().getName());
}
public void componentMoved(ComponentEvent e) {
Component c = e.getComponent();
System.out.println("componentMoved event from " + c.getClass().getName()
+ "; new location: " + c.getLocation().x + ", " + c.getLocation().y);
}
public void componentResized(ComponentEvent e) {
Component c = e.getComponent();
System.out.println("componentResized event from " + c.getClass().getName() + "; new size: "
+ c.getSize().width + ", " + c.getSize().height);
}
public void componentShown(ComponentEvent e) {
System.out.println("componentShown event from " + e.getComponent().getClass().getName());
}
});
frame.add(checkbox, "North");
frame.setSize(300, 200);
frame.setVisible(true);
}
}
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