import java.awt.*;
import java.applet.*;public class a extends Applet {
public void paint(Graphics g){
g.drawRect(1,2,3,4)
}
}
import java.applet.*;public class a extends Applet {
public void paint(Graphics g){
g.drawRect(1,2,3,4)
}
}
jframe jwindow等上面
public class a extends JFrame {
public void paint(Graphics g){
g.drawRect(1,2,3,4)
} public static void main(String args[])
{
a aa = new a();
a.setSize
a.show
}}
import java.awt.*;public class TreeTest extends JFrame {
private MyPanel p;
public TreeTest() {
super("hello");
Container c = getContentPane();
p = new MyPanel();
p.setPreferredSize(new Dimension(100, 100));
c.add(p);
pack();
setVisible(true);
}
public static void main(String[] args) {
new TreeTest();
}
} class MyPanel extends JPanel {
public void paint(Graphics g) {
g.drawRect(1, 1, 20, 20);
}
}