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    <p>AFAIK the only way of growing or reducing an array is doing a System.arraycopy</p> <pre><code> /** * Removes the element at the specified position in this list. * Shifts any subsequent elements to the left (subtracts one from their * indices). * * @param index the index of the element to removed. * @return the element that was removed from the list. * @throws IndexOutOfBoundsException if index out of range &lt;tt&gt;(index * &amp;lt; 0 || index &amp;gt;= length)&lt;/tt&gt;. */ public static &lt;T&gt; T[] removeArrayIndex(T[] src, int index) { Object[] tmp = src.clone(); int size = tmp.length; if ((index &lt; 0) &amp;&amp; (index &gt;= size)) { throw new ArrayIndexOutOfBoundsException(index); } int numMoved = size - index - 1; if (numMoved &gt; 0) { System.arraycopy(tmp, index + 1, tmp, index, numMoved); } tmp[--size] = null; // Let gc do its work return (T[]) Arrays.copyOf(tmp, size - 1); } /** * Inserts the element at the specified position in this list. * Shifts any subsequent elements to the rigth (adds one to their indices). * * @param index the index of the element to inserted. * @return the element that is inserted in the list. * @throws IndexOutOfBoundsException if index out of range &lt;tt&gt;(index * &amp;lt; 0 || index &amp;gt;= length)&lt;/tt&gt;. */ public static &lt;T&gt; T[] insertArrayIndex(T[] src, Object newData, int index) { Object[] tmp = null; if (src == null) { tmp = new Object[index+1]; } else { tmp = new Object[src.length+1]; int size = tmp.length; if ((index &lt; 0) &amp;&amp; (index &gt;= size)) { throw new ArrayIndexOutOfBoundsException(index); } System.arraycopy(src, 0, tmp, 0, index); System.arraycopy(src, index, tmp, index+1, src.length-index); } tmp[index] = newData; return (T[]) Arrays.copyOf(tmp, tmp.length); } </code></pre>
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    1. POMost memory efficient way to grow an array in Java?
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    1. USCarlos Tasada
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    1. COI should look this up before I make myself look silly (but time is an issue ATM), but don't you need a throws clause in the method declaration for the ArrayIndexOutOfBoundsException, or is that unchecked?
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    2. COI would need to double check, but this code is copy&paste from an utility class that I've in production (but I'm not sure if this code is used anymore) ;)
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      1. USCarlos Tasada
    3. COArrayIndexOutOfBoundsException is definitely unchecked.
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