Criar Telas de protótipo

import javax.swing.*;

public class tela {

         public void go(){
		
		JFrame frame = new JFrame("minha tela");
		JPanel painel = new JPanel();
		
		JLabel text = new JLabel("ola");
		
		painel.add(text);
		frame.add(painel);
		
		frame.setSize(300, 300);
		frame.setVisible(true);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
	}
	
	
	public static void main (String args[]){
		
		tela  janela = new tela ();
		janela.go();
	}
}