Java – How to join Arrays (JNNC Technologies)

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.

JoinArray.java

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.

pom.xml

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