package listener;
import java.awt.*;
import javax.swing.*;
public class ControCicle1 extends JFrame{
private JButton jbtEnlarge=new JButton("large");
private JButton jbtShrink=new JButton("shrink");
private CirclePanel canvas=new CirclePanel();
public ControCicle1(){
JPanel panel =new JPanel();
panel.add(jbtEnlarge);
panel.add(jbtShrink);
this.add(canvas, BorderLayout.CENTER);
this.add(panel, BorderLayout.SOUTH);
}
public static void main(String[] args){
JFrame frame=new JFrame();
frame.setSize(500, 500);
frame.setTitle("ControCicle1");
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
可以运行,但是所有的控件都显示不出来,求高手指教