import javax.swing.JFrame; //Importing class JFrame
import javax.swing.JLabel; //Importing class JLabel
public class HelloWorld {
public static void main(String[] args) {
JFrame frame = new JFrame(); //Creating frame
frame.setTitle("Hi!"); //Setting title frame
frame.add(new JLabel("Hello, world!"));//Adding text to frame
frame.pack(); //Setting size to smallest
frame.setLocationRelativeTo(null); //Centering frame
frame.setVisible(true); //Showing frame
}
}