Java Lat-2

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

public class lat2 extends JFrame{
public static void main(String args[]){
  lat2 windowku=new lat2();
  windowku.setSize(400,250); 
  Dimension screen =Toolkit.getDefaultToolkit().getScreenSize();
  int lebar=(screen.width-windowku.getSize().width)/2;
  int tinggi=(screen.height-windowku.getSize().height)/2;
  windowku.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  windowku.setLocation(lebar,tinggi); //Tengahkan lebar screen 
  windowku.setVisible(true); 
  windowku.setResizable(false); //Tidak bisa diubah ukuran form
}
}