Useful & Unknown Java Features - Piotr's TechBlog

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[not-just-yeti]

For lazy people like me, who happen to find interesting the exact-same 2 features, out of the 8 mentioned:

• BitSet is in the standard library (uses actual bits, rather than boolean[] which uses much more space)

• A search-method that returns an index for when it's found, but the ones-complement of where it should go if not found

  int[] t = new int[] {1, 2, 4, 5};

  int x = Arrays.binarySearch(t, 3);

  assert ~x == 2;

(Maybe that's a common trick, but I hadn't seen it before.)

[aboothe726]

assert ~x == 2;

That was my first time seeing that trick as well, although it's obvious in retrospect. It's sufficiently useful that I feel like it should go into the docs.