In this article, we will show you a few ways to join a Java Array.

1. Apache Commons Lang – ArrayUtils
2. Java API
3. Java 8 Stream

1. Apache Commons Lang – ArrayUtils

The simplest way is add the Apache Commons Lang library, and use ArrayUtils. addAll to join arrays. This method supports both primitive and object type arrays.

package com.mkyong.example.array;

import org.apache.commons.lang3.ArrayUtils;

import java.util.Arrays;

public class JoinArray {

 public static void main(String[] args) {

 String[] s1 = new String[]{"a", "b", "c"};
 String[] s2 = new String[]{"d", "e", "f"};

 String[] result = ArrayUtils.addAll(s1, s2);

 System.out.println(Arrays.toString(result));

		int [] int1 = new int[]{1,2,3};
 int[] int2 = new int[]{4,5,6};

 int[] result2 = ArrayUtils.addAll(int1, int2);

 System.out.println(Arrays.toString(result2));

 }

}

Output

[a, b, c, d, e, f]
[1, 2, 3, 4, 5, 6]

For Maven user.

<dependency>
 <groupId>org.apache.commons</groupId>
 <artifactId>commons-lang3</artifactId>
 <version>3.4</version>
</dependency>

2. Java API

Pure Java API example, supports both primitive and generic types.

package com.mkyong.example.array;

import java.lang.reflect.Array;
import java.util.Arrays;

public class JoinArray {

 public static void main(String[] args) {

 String[] s1 = new String[]{"a", "b", "c"};
 String[] s2 = new String[]{"d", "e", "f"};
 String[] s3 = new String[]{"g", "h", "i"};

 String[] result = joinArrayGeneric(s1, s2, s3);

 System.out.println(Arrays.toString(result));

 int[] int1 = new int[]{1, 2, 3};
 int[] int2 = new int[]{4, 5, 6};
 int[] int3 = new int[]{7, 8, 9};

 int[] result2 = joinArray(int1, int2, int3);

 System.out.println(Arrays.toString(result2));

 }

 static <T> T[] joinArrayGeneric(T[]... arrays) {
 int length = 0;
 for (T[] array : arrays) {
 length += array.length;
 }

 //T[] result = new T[length];
 final T[] result = (T[]) Array.newInstance(arrays[0].getClass().getComponentType(), length);

 int offset = 0;
 for (T[] array : arrays) {
 System.arraycopy(array, 0, result, offset, array.length);
 offset += array.length;
 }

 return result;
 }

 static int[] joinArray(int[]... arrays) {
 int length = 0;
 for (int[] array : arrays) {
 length += array.length;
 }

 final int[] result = new int[length];

 int offset = 0;
 for (int[] array : arrays) {
 System.arraycopy(array, 0, result, offset, array.length);
 offset += array.length;
 }

 return result;
 }

	//create other overloaded primitive type - long, double...
	//static long[] joinArray(long[]... arrays) 
}

Output

[a, b, c, d, e, f, g, h, i]
[1, 2, 3, 4, 5, 6, 7, 8, 9]

3. Java 8 Stream

Java 8 Stream example to join arrays.

package com.mkyong.example.array;

import java.util.Arrays;

import java.util.stream.IntStream;
import java.util.stream.Stream;

public class JoinArray {

 public static void main(String[] args) {

 String[] s1 = new String[]{"a", "b", "c"};
 String[] s2 = new String[]{"d", "e", "f"};
 String[] s3 = new String[]{"g", "h", "i"};

		//join object type array
 String[] result = Stream.of(s1, s2, s3).flatMap(Stream::of).toArray(String[]::new);
 System.out.println(Arrays.toString(result));

 int [] int1 = new int[]{1,2,3};
 int[] int2 = new int[]{4,5,6};
 int[] int3 = new int[]{7,8,9};

		//join 2 primitive type array
 int[] result2 = IntStream.concat(Arrays.stream(int1), Arrays.stream(int2)).toArray();

		//join 3 primitive type array, any better idea?
 int[] result3 = IntStream.concat(Arrays.stream(int1), 
			IntStream.concat(Arrays.stream(int2), Arrays.stream(int3))).toArray();

 System.out.println(Arrays.toString(result2));

 System.out.println(Arrays.toString(result3));

 }

}

Output

[a, b, c, d, e, f, g, h, i]
[1, 2, 3, 4, 5, 6]
[1, 2, 3, 4, 5, 6, 7, 8, 9]

Any better Java 8 Stream example? Do comment below.

References

1. Apache Commons Lang – ArrayUtils
2. Java 8 Stream JavaDoc
3. Java 8: Replace traditional for loops with IntStreams
4. Java 8 Stream Tutorial