แทรกรูปภาพ JFrame

[asylu3]

import java.awt.image.*;
import java.awt.*;
import javax.swing.*;

public class ShowPic extends JFrame {
Toolkit toolkit=Toolkit.getDefaultToolkit();
Image picture=toolkit.getImage("logo.png");
ImageObserver imgObrv;
private int h;
ShowPic(){
super("Test");
picture.getHeight(imgObrv);
setSize(300,200);
setVisible(true);
//show();

}
public void paint(Graphics g){

g.drawImage(picture,20,20,this);
}

public static void main(String args[]){
ShowPic obj=new ShowPic();
System.out.println(obj.h);
}

}