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    <p>Not the fastest runtime solution probably, but the fastest I could come up with that seems to work. Create an Index class and use it as a key for a SortedMap, like:</p> <pre><code> SortedMap&lt;Index, Object&gt; entries = new TreeMap&lt;Index, Object&gt;(); entries.put(new Index(1, 4), "1-4"); entries.put(new Index(5555555555l, 767777777777l), "5555555555l-767777777777l"); System.out.println(entries.size()); System.out.println(entries.get(new Index(1, 4))); System.out.println(entries.get(new Index(5555555555l, 767777777777l))); </code></pre> <p>My Index class looks like this (with some help from Eclipse code generator).</p> <pre><code>public static class Index implements Comparable&lt;Index&gt; { private long x; private long y; public Index(long x, long y) { super(); this.x = x; this.y = y; } public int compareTo(Index index) { long ix = index.x; if (ix == x) { long iy = index.y; if (iy == y) { return 0; } else if (iy &lt; y) { return -1; } else { return 1; } } else if (ix &lt; x) { return -1; } else { return 1; } } public int hashCode() { final int PRIME = 31; int result = 1; result = PRIME * result + (int) (x ^ (x &gt;&gt;&gt; 32)); result = PRIME * result + (int) (y ^ (y &gt;&gt;&gt; 32)); return result; } public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; final Index other = (Index) obj; if (x != other.x) return false; if (y != other.y) return false; return true; } public long getX() { return x; } public long getY() { return y; } } </code></pre>
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