FileHandler

package chp12;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.JFrame;
import javax.swing.JMenuBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

public class TextFiles {
    public static void main (String [] args){
        NotepadFrame3 f=new NotepadFrame3();
        f.setVisible(true);
    }
}

class NotepadFrame3 extends JFrame{
    private static int WIDTH=600;
    private static int HEIGHT=600;

    public NotepadFrame3(){
        setSize(WIDTH, HEIGHT);
        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        final JTextArea textArea=new JTextArea();

        JMenuBar menuBar=new JMenuBar();
        setJMenuBar(menuBar);
        JMenu fileMenu=new JMenu("File");
        menuBar.add(fileMenu);
        JMenuItem openMenuItem=new JMenuItem("Open...");
        fileMenu.add(openMenuItem);
        openMenuItem.addActionListener(new ActionListener(){
           public void actionPerformed(ActionEvent e){
               JFileChooser fileChooser=new JFileChooser();
               if(fileChooser.showDialog(NotepadFrame3.this, "Open")==JFileChooser.APPROVE_OPTION){
                   File newFile=fileChooser.getSelectedFile();
                   try(Scanner fileHandler=new Scanner (newFile)){
                       textArea.setText("");
                       while(fileHandler.hasNext()){
                           String line=fileHandler.nextLine();
                           textArea.append(line+"\n");
                       }
                   }catch (Exception exception){
                       System.out.println ("Error");
                   }
               }
           }
        });
        add(new JScrollPane(textArea), BorderLayout.CENTER);
    }
}