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| 15. 20. 1. 如何写一个项目事件监听 |
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import java.awt.Color;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.AbstractButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
public class JCheckBoxItemListener {
public static void main(String args[]) {
JFrame frame = new JFrame("Iconizing CheckBox");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JCheckBox aCheckBox4 = new JCheckBox("Stuffed Crust");
ItemListener itemListener = new ItemListener() {
public void itemStateChanged(ItemEvent itemEvent) {
AbstractButton abstractButton = (AbstractButton)itemEvent.getSource();
Color foreground = abstractButton.getForeground();
Color background = abstractButton.getBackground();
int state = itemEvent.getStateChange();
if (state == ItemEvent.SELECTED) {
abstractButton.setForeground(background);
abstractButton.setBackground(foreground);
}
}
};
aCheckBox4.addItemListener(itemListener);
frame.add(aCheckBox4);
frame.setSize(300, 200);
frame.setVisible(true);
}
}
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