badidea2.java

来自「翁剀JAVA语言那门课程的教案 很多人都看多他的视频教程可惜没有ppt的教案」· Java 代码 · 共 43 行

//: BadIdea2.java
// An improvement over BadIdea1.java, since it
// uses the WindowAdapter as an inner class
// instead of implementing all the methods of
// WindowListener, but still misses the
// valuable modularity of inner classes
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class BadIdea2 extends Frame
implements ActionListener {
Button
b1 = new Button("Button 1"),
b2 = new Button("Button 2");
public BadIdea2() {
setLayout(new FlowLayout());
addWindowListener(new WL());
b1.addActionListener(this);
b2.addActionListener(this);
add(b1);
add(b2);
}
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
if(source == b1)
System.out.println("Button 1 pressed");
else if(source == b2)
System.out.println("Button 2 pressed");
else
System.out.println("Something else");
}
class WL extends WindowAdapter {
public void windowClosing(WindowEvent e) {
System.out.println("Window Closing");
System.exit(0);
}
}
public static void main(String[] args) {
Frame f = new BadIdea2();
f.setSize(300,200);
f.setVisible(true);
}
} ///:~