Open a text file into JTextArea

Complete source code below will show you, how to open a text file with file extension (.txt) into JTextArea.

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COMPLETE SOURCE CODE FOR : OpenTextFileIntoJTextArea.java
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import javax.swing.*;

import java.util.*;

import java.io.*;

public class OpenTextFileIntoJTextArea
{
public static void main(String[]args)
{
 try
 {
  //Read a text file named MyTextFile.txt
  //You can download this text file at the link below
  //You also can change to other text file by change it's name
  //Don't forget to put .txt
  //If your text file locate at other location,
  //you must put it full location.
  //For example :
  //C:\\Documents and Settings\\evergreen\\MyTextFile.txt
  FileReader readTextFile=new FileReader("MyTextFile.txt");

  //Create a scanner object from FileReader
  Scanner fileReaderScan=new Scanner(readTextFile);

  //Create a String that will store all text in the text file
  String storeAllString="";

  //Put all text from text file into created String
  while(fileReaderScan.hasNextLine())
  {
   String temp=fileReaderScan.nextLine()+"\n";
  
   storeAllString=storeAllString+temp;
  }

  //Set JTextArea text to created String
  JTextArea textArea=new JTextArea(storeAllString);
 
  //Set JTextArea to line wrap
  textArea.setLineWrap(true);
 
  //Set JTextArea text to word wrap
  textArea.setWrapStyleWord(true);
 
  //Create scrollbar for text area
  JScrollPane scrollBarForTextArea=new JScrollPane(textArea,JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
 
  //Create a window using JFrame with title ( Open text file into JTextArea )
  JFrame frame=new JFrame("Open text file into JTextArea");
 
  //Add scrollbar into JFrame
  frame.add(scrollBarForTextArea);
 
  //Set default close operation for JFrame
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
  //Set JFrame size
  frame.setSize(500,500);
 
  //Make JFrame locate at center on screen
  frame.setLocationRelativeTo(null);
 
  //Make JFrame visible
  frame.setVisible(true);
 }
 catch(Exception exception)
 {
  //Print Error in file processing if it can't process your text file
  System.out.println("Error in file processing");
 }
}
}

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JUST COMPILE AND EXECUTE IT
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CLICK HERE TO DOWNLOAD MyTextFile.txt