从程序看python程序员的进化

//鼠标单击事件无论什么时候都监听，即使按钮已经不能用了，事件依然走；

//一般事件，在设置按钮不可用后就不在走了

例子很能说明问题：

package eeeee;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

import org.dyno.visual.swing.layouts.Constraints;
import org.dyno.visual.swing.layouts.GroupLayout;
import org.dyno.visual.swing.layouts.Leading;

//VS4E -- DO NOT REMOVE THIS LINE!
public class bbbb extends JFrame {

private static final long serialVersionUID = 1L;
private JButton jButton0;
private JButton jButton1;
private static final String PREFERRED_LOOK_AND_FEEL = "javax.swing.plaf.metal.MetalLookAndFeel";
public bbbb() {
initComponents();
}

private void initComponents() {
setLayout(new GroupLayout());
add(getJButton0(), new Constraints(new Leading(52, 10, 10), new Leading(39, 10, 10)));
add(getJButton1(), new Constraints(new Leading(195, 10, 10), new Leading(39, 12, 12)));
setSize(320, 240);
}

private JButton getJButton1() {
if (jButton1 == null) {
jButton1 = new JButton();
jButton1.setText("jButton1");
jButton1.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent event) {
jButton1ActionActionPerformed(event);
}
});
}
return jButton1;
}

private JButton getJButton0() {
if (jButton0 == null) {
jButton0 = new JButton();
jButton0.setText("jButton0");
jButton0.addMouseListener(new MouseAdapter() {

public void mouseClicked(MouseEvent event) {
jButton0MouseMouseClicked(event);
}
});
}
return jButton0;
}

private static void installLnF() {
try {
String lnfClassname = PREFERRED_LOOK_AND_FEEL;
if (lnfClassname == null)
lnfClassname = UIManager.getCrossPlatformLookAndFeelClassName();
UIManager.setLookAndFeel(lnfClassname);
} catch (Exception e) {
System.err.println("Cannot install " + PREFERRED_LOOK_AND_FEEL
+ " on this platform:" + e.getMessage());
}
}

/**
* Main entry of the class.
* Note: This class is only created so that you can easily preview the result at runtime.
* It is not expected to be managed by the designer.
* You can modify it as you like.
*/
public static void main(String[] args) {
installLnF();
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
bbbb frame = new bbbb();
frame.setDefaultCloseOperation(bbbb.EXIT_ON_CLOSE);
frame.setTitle("bbbb");
frame.getContentPane().setPreferredSize(frame.getSize());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
//00
private void jButton0MouseMouseClicked(MouseEvent event) {
jButton0.setEnabled(false);
System.out.println("click 00");
}
//11
private void jButton1ActionActionPerformed(ActionEvent event) {
jButton1.setEnabled(false);
System.out.println("click 1111");
}

}

点击button0后，它设置成不可用，但它依然响应事件（里面的打印输出了）

而点击button1后，设置它不可用，再点击它，就没反应了，说明真的不可用了。

从这里我们直观的看出两种事件的区别，更深的道理我就不说了，嘿嘿