Java의 파일 선택기

package delftstack;

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.LayoutManager;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class File_Chooser {
  public static void main(String[] args) {
    File_Chooser_Window();
  }

  private static void File_Chooser_Window() {
    JFrame File_Chooser_Frame = new JFrame("File Chooser");
    File_Chooser_Frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Create_UI(File_Chooser_Frame);
    File_Chooser_Frame.setSize(560, 200);
    File_Chooser_Frame.setLocationRelativeTo(null);
    File_Chooser_Frame.setVisible(true);
  }

  private static void Create_UI(final JFrame File_Chooser_Frame) {
    JPanel File_Chooser_Panel = new JPanel();
    LayoutManager Layout_Manager = new FlowLayout();
    File_Chooser_Panel.setLayout(Layout_Manager);

    JButton Choose_Button = new JButton("Choose File");
    final JLabel J_Label = new JLabel();

    Choose_Button.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        JFileChooser J_File_Chooser = new JFileChooser();
        J_File_Chooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
        int option = J_File_Chooser.showOpenDialog(File_Chooser_Frame);
        if (option == JFileChooser.APPROVE_OPTION) {
          File file = J_File_Chooser.getSelectedFile();
          J_Label.setText("Selected: " + file.getName());
        } else {
          J_Label.setText("Command Canceled");
        }
      }
    });

    File_Chooser_Panel.add(Choose_Button);
    File_Chooser_Panel.add(J_Label);
    File_Chooser_Frame.getContentPane().add(File_Chooser_Panel, BorderLayout.CENTER);
  }
}