Java JButton set enabled state to false(disable JButton)

import java.awt.FlowLayout;

import javax.swing.JButton;
import javax.swing.JFrame;

public class Main extends JFrame {
  public Main() {
    super("JButton");

    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setLayout(new FlowLayout());

    JButton closeButton1 = new JButton("Close");
    closeButton1.setEnabled(false);/*  w w  w. ja v  a 2 s .c  om*/
    getContentPane().add(closeButton1);
  }

  public static void main(String[] args) {
    Main frame = new Main();
    frame.pack();
    frame.setVisible(true);
  }
}