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Postsdbo
PO
 

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  1. PO
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    <p>I ended up writing something of my own.</p> <p>There's a main method which does all the work:</p> <pre><code>@SuppressWarnings("unchecked") private static &lt;T&gt; T[] mergeInternal(@Nonnull T[] first, @Nonnull T[] second, @Nullable T[] third, @Nullable T[] fourth, @Nullable T[] fifth, @Nullable T[] sixth) { int overallLength = first.length + second.length; if (third != null) { overallLength += third.length; } if (fourth != null) { overallLength += fourth.length; } if (fifth != null) { overallLength += fifth.length; } if (sixth != null) { overallLength += sixth.length; } Object[] joinedArray = (Object[]) Array.newInstance(first.getClass().getComponentType(), overallLength); System.arraycopy(first, 0, joinedArray, 0, first.length); System.arraycopy(second, 0, joinedArray, first.length, second.length); int copyTargetPosition = first.length + second.length; if (third != null) { System.arraycopy(third, 0, joinedArray, copyTargetPosition, third.length); copyTargetPosition += third.length; } if (fourth != null) { System.arraycopy(fourth, 0, joinedArray, copyTargetPosition, fourth.length); copyTargetPosition += fourth.length; } if (fifth != null) { System.arraycopy(fifth, 0, joinedArray, copyTargetPosition, fifth.length); copyTargetPosition += fifth.length; } if (sixth != null) { System.arraycopy(sixth, 0, joinedArray, copyTargetPosition, sixth.length); } return (T[]) joinedArray; } </code></pre> <p>..and then there's an entry method for each combination of number of parameters (2..6), like so:</p> <pre><code>public static &lt;T&gt; T[] merge(@Nonnull T[] first, @Nonnull T[] second) { Preconditions.checkNotNull(first); Preconditions.checkNotNull(second); return mergeInternal(first, second, null, null, null, null); } public static &lt;T&gt; T[] merge(@Nonnull T[] first, @Nonnull T[] second, @Nonnull T[] third) ... public static &lt;T&gt; T[] merge(@Nonnull T[] first, @Nonnull T[] second, @Nonnull T[] third, @Nonnull T[] fourth) </code></pre> <p>And so on.</p> <p>I think one rarely needs to merge more than 6 arrays and if you need to, you can always easily extend the given idea.</p>
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    1. POHow to join two arrays of parametrized types (in guava)
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      1. PTQuestion
    1. PTAnswer
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    1. USmindas
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    1. COThanks, but I was specifically interested in a built-in method.
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      1. PO
      1. USJakub Bochenski
 

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