Concatenates the byte arrays in Java

Following snippet concatenates the byte arrays in Java.

public static byte[] concat(byte[]... byteArrays) {

	try {
		ByteArrayOutputStream baos = new ByteArrayOutputStream();

		for (byte[] byteArray : byteArrays) {

			if (byteArray == null) {
				continue;
			}

			baos.write(byteArray);
		}
		return baos.toByteArray();

	} catch (IOException e) {
		throw new IllegalStateException(e.getMessage(), e);
	}
}

Above snippet defines a method ‘concat’ that combines multiple byte arrays into a single byte array. It uses a ByteArrayOutputStream to store the concatenated byte arrays. The method checks for null byte arrays and skips them. For non-null byte arrays, it writes their content to the ByteArrayOutputStream. After processing all input byte arrays, the content of the ByteArrayOutputStream is converted into a single byte array, which is then returned.

 

Find the below working application.

 

ByteArrayConcatenation.java

package com.sample.app;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

public class ByteArrayConcatenation {

	public static byte[] concat(byte[]... byteArrays) {

		try {
			ByteArrayOutputStream baos = new ByteArrayOutputStream();

			for (byte[] byteArray : byteArrays) {

				if (byteArray == null) {
					continue;
				}

				baos.write(byteArray);
			}
			return baos.toByteArray();

		} catch (IOException e) {
			throw new IllegalStateException(e.getMessage(), e);
		}
	}

	public static void main(String[] args) {
		byte[] arr1 = { 2, 3, 5, 7 };
		byte[] arr2 = { 23, 25, 27, 29 };
		byte[] arr3 = { 33, 35, 37, 39 };

		byte[] concatenatedArray = concat(arr1, arr2, arr3);
		
		System.out.println("Elements in the concatenated array are : ");
		for(byte b : concatenatedArray) {
			System.out.println(b);
		}

	}

}

Output

Elements in the concatenated array are : 
2
3
5
7
23
25
27
29
33
35
37
39

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