---
title: "How to write program to file Concatenation program in java i/o ."  
description: "How to write program to file Concatenation program in java i/o ."  
author: "Jonas Stuart"  
published: 2016-07-15  
updated: 2016-07-15  
canonical: https://www.mindstick.com/forum/34153/how-to-write-program-to-file-concatenation-program-in-java-i-o  
category: "java"  
tags: ["java", "java i/o"]  
reading_time: 1 minute  

---

# How to write program to file Concatenation program in java i/o .

Hi buddy\
Please help me to write [program](https://www.mindstick.com/blog/12337/scaling-up-your-mentorship-program) to [file](https://www.mindstick.com/articles/59/encrypting-and-decrypting-files-using-c-sharp) Concatenation program in [java](https://www.mindstick.com/articles/12214/web-development-company-in-india-laid-on-the-foundation-of-concrete-java-programming) i/o.I would really appreciate your helpThanks

## Replies

### Reply by Ailsa Singh

Hi Jones\
Check this program code.I think it will help you.\

```
import java.io.*; public class Concatenate {                     public static void concenateFile(String...fileName) {                             String str = null;                             try (BufferedWriter writer = new BufferedWriter(new FileWriter(                                                "CombinedFile.txt"));)
{                                      for(String name : fileName) {                                                try(BufferedReader reader =                                                                          new
BufferedReader(new FileReader(                                                                   name));)
{                                                          while
((str = reader.readLine()) != null) {                                                                   writer.write(str);                                                                   writer.newLine();                                                          }                                                }
catch (IOException e) {                                                          System.out.println("Error reading/writing file");                                                }                                      }                             } catch (Exception
e) {                                      e.printStackTrace();                             }                     }                      public static void main(String[] args) {                             if (args.length < 0) {                                      System.out.println("Usage: java Concatenate file1 file2");                                      System.exit(0);                             }                             concenateFile(args);                             System.out.println("Successfully created CombinedFile.txt");                     }}
```


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Original Source: https://www.mindstick.com/forum/34153/how-to-write-program-to-file-concatenation-program-in-java-i-o

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