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    <p>Here's a simple method that will concatenate two arrays and return the result:</p> <pre><code>public &lt;T&gt; T[] concatenate(T[] a, T[] b) { int aLen = a.length; int bLen = b.length; @SuppressWarnings("unchecked") T[] c = (T[]) Array.newInstance(a.getClass().getComponentType(), aLen + bLen); System.arraycopy(a, 0, c, 0, aLen); System.arraycopy(b, 0, c, aLen, bLen); return c; } </code></pre> <p>Note like it will not work with primitives, only with object types.</p> <p>The following slightly more complicated version works with both object and primitive arrays. It does this by using <code>T</code> instead of <code>T[]</code> as the argument type.</p> <p>It also makes it possible to concatenate arrays of two different types by picking the most general type as the component type of the result.</p> <pre><code>public static &lt;T&gt; T concatenate(T a, T b) { if (!a.getClass().isArray() || !b.getClass().isArray()) { throw new IllegalArgumentException(); } Class&lt;?&gt; resCompType; Class&lt;?&gt; aCompType = a.getClass().getComponentType(); Class&lt;?&gt; bCompType = b.getClass().getComponentType(); if (aCompType.isAssignableFrom(bCompType)) { resCompType = aCompType; } else if (bCompType.isAssignableFrom(aCompType)) { resCompType = bCompType; } else { throw new IllegalArgumentException(); } int aLen = Array.getLength(a); int bLen = Array.getLength(b); @SuppressWarnings("unchecked") T result = (T) Array.newInstance(resCompType, aLen + bLen); System.arraycopy(a, 0, result, 0, aLen); System.arraycopy(b, 0, result, aLen, bLen); return result; } </code></pre> <p>Here is an example:</p> <pre><code>Assert.assertArrayEquals(new int[] { 1, 2, 3 }, concatenate(new int[] { 1, 2 }, new int[] { 3 })); Assert.assertArrayEquals(new Number[] { 1, 2, 3f }, concatenate(new Integer[] { 1, 2 }, new Number[] { 3f })); </code></pre>
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    1. POHow can I concatenate two arrays in Java?
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    1. COI like this suggestion since it is less dependent on the latest Java versions. In my projects I'm often stuck using older versions of Java or CLDC profiles where some of the facilities like those mentioned by Antti are not available.
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