Java program to alternately merge two or more files into a third file

Suppose we have three files -

output1.txt

Hello how are you

output2.txt

Welcome to Tutorialspoint

output3.txt

We provide simply easy learning

Example

The following Java example alternately merges the contents of the above three files into one file-

import java.util.Scanner;
public class MergingFiles {
   public static void main(String args[]) throws IOException {
      Scanner sc1 = new Scanner(new File("D://input1.txt"));
      Scanner sc2 = new Scanner(new File("D://input2.txt"));
      Scanner sc3 = new Scanner(new File("D://input3.txt"));
      FileWriter writer = new FileWriter("D://result.txt");
      String str[] = new String[3];
      while (sc1.hasNextLine()||sc2.hasNextLine()||sc3.hasNextLine()) {
         str[0] = sc1.nextLine();
         str[1] = sc2.nextLine();
         str[2] = sc3.nextLine();
      }
      writer.append(str[0]+"\n");
      writer.append(str[1]+"\n");
      writer.append(str[2]+"\n");
      writer.flush();
      System.out.println("Contents added ");
   }
}

Output

Contents added

If the above three files are directly in the same file, you can rewrite the example program as -

Example

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;
public class MergingFiles {
   public static void main(String args[]) throws IOException {
      //Creating a File object for directory
      File directoryPath = new File("D:\example");
      //List of all files and directories
      File filesList[] = directoryPath.listFiles();
      Scanner sc = null;
      FileWriter writer = new FileWriter("D://output.txt");
      for(File file : filesList) {
         sc = new Scanner(file);
         String input;
         StringBuffer sb = new StringBuffer();
         while (sc.hasNextLine()) {
            input = sc.nextLine();
            writer.append(input+"\n");
         }
         writer.flush();
      }
      System.out.println("Contents added ");
   }
}

Output

Contents added

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