拿来的错
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
public class test extends Applet
{
Button b1;
public void init()
{
b1 = new Button("Display");
add(b1);
frame f = new frame();
add(f);
}
}
class frame
{
Button b2;
frame()
{
b2 = new Button("button");
}
}