How to place panel into frame

Question

Hi Everybody !! I am new to Swing and am working on a GUI based Elevator Simulation System. I am using Frame on which I am trying to put a Panel. But the panel does not set to the size I want it to even if I use setSize() method. I am posting the code .Could anyone please help me.
Thanks !!
package elevator;
import javax.swing.*;
import java.awt.*;
public class Controller {
    public static void main(String args[])
      Container cpane;
      JFrame frame = new JFrame("ELEVATOR");
      cpane = frame.getContentPane();
      Lift1Panel lp1 = new Lift1Panel();
      frame.setVisible(true);
      frame.setSize(1300,800);
      frame.add(lp1);
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
package elevator;
import javax.swing.*;
import java.awt.*;
public class Lift1Panel extends JPanel {
    public Lift1Panel()
     setSize(200,200);
    public void paintComponent(Graphics g)
     super.paintComponent(g);
     Graphics2D g2d = (Graphics2D)g;
     g2d.setColor(Color.WHITE);
     g2d.drawRect(10,10,100,100);  
}

Answer 1

if you use setPreferredSize, don't forget to call frame.pack();. Also, you must realize that the default layout for the contentPane is the BorderLayout, and the default location for adding to this is the BorderLayout.CENTER position. At this location, setPreferredSize is ignored and the central component is expanded to fill the region. You may wish to use a different layout such as the FlowLayout. Experiment with this.