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Read/Write Text Files Java code example - Click here to copy ->>>

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A few decades ago, a text editor, a simple command-line compiler, and possibly a debugger were sufficient to develop software. Programs were composed offline and debugging meant simply inserting output statements to the code.

Today, these tools have been combined in increasingly sophisticated and graphical integrated development environments (IDEs), which usually come with features such as syntax highlighting, code auto-completion, refactoring, unit testing support, and visual editors. IDEs for object-oriented languages offer tools for managing classes and objects, such as class hierarchy views. Needless to say, IDEs are making software development increasingly productive.

Java developers can choose a commercial product, such as JBuilder or IntelliJ IDEA, or a free and open source equivalent, such as Eclipse or NetBeans.

Code:

 
// -----------------------------------------------------------------------------
// ReadWriteTextFile.java
// -----------------------------------------------------------------------------

/*
 * =============================================================================
 * Copyright (c) 1998-2005 Jeffrey M. Hunter. All rights reserved.
 *
 * All source code and material located at the Internet address of
 * http://www.idevelopment.info is the copyright of Jeffrey M. Hunter, 2005 and
 * is protected under copyright laws of the United States. This source code may
 * not be hosted on any other site without my express, prior, written
 * permission. Application to host any of the material elsewhere can be made by
 * contacting me at jhunter@idevelopment.info.
 *
 * I have made every effort and taken great care in making sure that the source
 * code and other content included on my web site is technically accurate, but I
 * disclaim any and all responsibility for any loss, damage or destruction of
 * data or any other property which may arise from relying on it. I will in no
 * case be liable for any monetary damages arising from such loss, damage or
 * destruction.
 *
 * As with any code, ensure to test this code in a development environment
 * before attempting to run it in production.
 * =============================================================================
 */
 
import java.io.FileReader;
import java.io.FileWriter;
import java.io.BufferedReader;
import java.io.PrintWriter;
import java.io.IOException;

/**
 * -----------------------------------------------------------------------------
 * This program takes the input of one file and outputs it to another in plain
 * text.
 *
 * @version 1.0
 * @author  Jeffrey M. Hunter  (jhunter@idevelopment.info)
 * @author  http://www.idevelopment.info
 * -----------------------------------------------------------------------------
 */

public class ReadWriteTextFile {

    private static void doReadWriteTextFile() {

        try {
       
            // input/output file names
            String inputFileName  = "README_InputFile.txt";
            String outputFileName = "ReadWriteTextFile.out";

            // Create FileReader Object
            FileReader inputFileReader   = new FileReader(inputFileName);
            FileWriter outputFileReader  = new FileWriter(outputFileName);

            // Create Buffered/PrintWriter Objects
            BufferedReader inputStream   = new BufferedReader(inputFileReader);
            PrintWriter    outputStream  = new PrintWriter(outputFileReader);

            // Keep in mind that all of the above statements can be combined
            // into the following:
            //BufferedReader inputStream = new BufferedReader(new FileReader("README_InputFile.txt"));
            //PrintWriter outputStream   = new PrintWriter(new FileWriter("ReadWriteTextFile.out"));

            outputStream.println("+---------- Testing output to a file ----------+");
            outputStream.println();

            String inLine = null;

            while ((inLine = inputStream.readLine()) != null) {
                outputStream.println(inLine);
            }

            outputStream.println();
            outputStream.println("+---------- Testing output to a file ----------+");

            outputStream.close();
            inputStream.close();

        } catch (IOException e) {

            System.out.println("IOException:");
            e.printStackTrace();

        }

    }


    /**
     * Sole entry point to the class and application.
     * @param args Array of String arguments.
     */
    public static void main(String[] args) {
        doReadWriteTextFile();
    }

}

 
 



References.

The list of classes which were used on this page you can find below. The links to Java API contain official SUN documentation about all used classes.

  java.io.PrintWriter

  java.io.FileReader

  java.lang.Object

  java.io.FileWriter

  java.io.BufferedReader

  java.io.IOException

  java.lang.reflect.Array




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