//It is easy
//Don't forget to mention package or it will cause error
import javax.swing.*;
public class coder83 {
public static void main(String[] args){
JFrame firstFrame = new JFrame();
//x and y are your wish
firstFrame.setsize(y,x);
firstFrame.setTitle("Coder83");
//It is important or else your window won't clode
firstFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
firstFrame.setVisible(true);
}}