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程序练习
import java.awt.*;
import java.awt.event.*;
class MyFrame extends Frame{
TextArea text;
MyFrame (String s){
super(s);
setBounds(100,100,200,300);
setVisible(true);
text = new TextArea();
add(text,BorderLayout.CENTER);
addWindowListener(new WindowAdapter(){
public void windowActivated(WindowEvent e){
text.append("\n我被激活了");
}
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
validate();
}
}
public class Test47{
public static void main(String args[]){
new MyFrame("窗口");
}
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class Test48 extends Applet {
Frame f,g;
public void init(){
f = new Frame("音乐之窗");
g = new Frame("体育之窗");
f.setSize(150,150);
g.setSize(200,200);
f.setVisible(true);
g.setVisible(false);
f.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
f.setVisible(false);
g.setVisible(true);
}
});
g.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
f.setVisible(true);
g.setVisible(false);
}
});
}
}
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