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    <p>You can write a custom <code>InputStream</code> implementation that does this. Example:</p> <pre><code>import java.io.IOException; import java.io.InputStream; import java.util.Collections; import java.util.Deque; import java.util.LinkedList; public class CatInputStream extends InputStream { private final Deque&lt;InputStream&gt; streams; public CatInputStream(InputStream... streams) { this.streams = new LinkedList&lt;InputStream&gt;(); Collections.addAll(this.streams, streams); } private void nextStream() throws IOException { streams.removeFirst().close(); } @Override public int read() throws IOException { int result = -1; while (!streams.isEmpty() &amp;&amp; (result = streams.getFirst().read()) == -1) { nextStream(); } return result; } @Override public int read(byte b[], int off, int len) throws IOException { int result = -1; while (!streams.isEmpty() &amp;&amp; (result = streams.getFirst().read(b, off, len)) == -1) { nextStream(); } return result; } @Override public long skip(long n) throws IOException { long skipped = 0L; while (skipped &lt; n &amp;&amp; !streams.isEmpty()) { int thisSkip = streams.getFirst().skip(n - skipped); if (thisSkip &gt; 0) skipped += thisSkip; else nextStream(); } return skipped; } @Override public int available() throws IOException { return streams.isEmpty() ? 0 : streams.getFirst().available(); } @Override public void close() throws IOException { while (!streams.isEmpty()) nextStream(); } } </code></pre> <p>This code isn't tested, so your mileage may vary.</p>
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    1. POHow do you merge two input streams in Java?
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    1. USChris Jester-Young
    1. USChris Jester-Young
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    1. CODoesn't this do the same thing as SequenceInputStream, as suggested by Merzbow?
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      1. USSam Barnum
    2. COSorry, but tackline suggested SequenceInputStream first (and I +1'd him for that). In SO, the earliest good answer wins; you never know if later answers are plagiarisms. Also, read my comment on tackline's answer for a comparison between SequenceInputStream and CatInputStream (I do take his point about using Collections.enumeration).
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      1. USChris Jester-Young
    3. COIf the person who downvoted my answer did so because of my last comment, I apologise; I should explain better: if I write an answer that turns out to be a duplicate (or subset) of an earlier-posted answer, I usually delete it, knowing that I will never receive any points for it. On SO, it really is "Fastest Gun in the West" (search for that question title).
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