Java GUI JButton

gistfile1.java

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

public class MyGUI {

JLabel l1,l2;
JTextField tf1,tf2;
JButton b1,b2;

public static void main(String[] args) {

// TODO, add your application code
new MyGUI();
}

public MyGUI(){
JFrame jf=new JFrame();
jf.setTitle("My frame");
jf.setSize(500,300);

JLabel l1=new JLabel("label 1");
JLabel l2=new JLabel("label 2");

JTextField tf1=new JTextField(10);
JTextField tf2=new JTextField(5);

JButton b1=new JButton("Button 1");
JButton b2=new JButton("Button 2");

tf1.setText("i am a text field");

tf2.setText("i am a text field and can not be changed");
tf2.setEditable(false);

Container pane=jf.getContentPane();
pane.setLayout(new GridLayout(3,2) );

pane.add(l1);
pane.add(l2);
pane.add(b1);
pane.add(b2);
pane.add(tf1);
pane.add(tf2);

jf.setDefaultCloseOperation(jf.EXIT_ON_CLOSE);
jf.setVisible(true);

}
}