为什么显示不了按钮?
import java.awt.Button;
import java.awt.Color;
import java.awt.Frame;
public class TSButton {
public static void main(String[] args) {
new pt("TestButton",300,300,400,400,Color.cyan);
// Button b = new Button("press me!");
//p.add(b);
}
}
class pt extends Frame{
Button b;
pt(String s,int x,int y,int w,int h,Color c){
super(s);
b = new Button("press me!");
b.setVisible(true);
add(b);
b = new Button("press me!");
b.setVisible(true);
add(b);
setBackground(c);
setLayout(null);
setBounds(x,y,w,h);
setVisible(true);
}
}