package g1;
//import com.sun.pisces.Surface;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.EventQueue;
import javax.swing.JPanel;
import javax.swing.JFrame;

class Surface extends JPanel{
    private void drawLine1(Graphics g){
        Graphics2D g2d = (Graphics2D)g.create();
        g2d.drawLine(100, 100, 500, 100);

    }
    @Override
    public void paintComponent(Graphics g){
        super.paintComponent(g);
        drawLine1(g);
    }
}

public class G1 extends JFrame{

    public G1(){
        initUI();
    }
    private void initUI(){
        add (new Surface());
        setTitle("testline1");
        setSize(480, 640);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                //throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
                G1 gl = new G1();
                gl.setVisible(true);
            }
        });
    }

}