Java Swing에서 JLabel 텍스트 변경

package delftstack;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;

public class Change_Jlabel {
  public static void main(String args[]) {
    JFrame Demo_Frame = new JFrame("Demo Frame");
    Demo_Frame.setLayout(new BorderLayout());
    Demo_Frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    Demo_Frame.setSize(250, 100);

    final JLabel J_Label = new JLabel("Original Label");
    JButton J_Button = new JButton("Change Label");
    J_Button.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent arg0) {
        J_Label.setText("New Label");
      }
    });

    Demo_Frame.add(J_Label, BorderLayout.NORTH);
    Demo_Frame.add(J_Button, BorderLayout.CENTER);
    Demo_Frame.setVisible(true);
  }
}