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java.util.BitSet class

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Since 1.7 there’s a java.util.BitSet class that provides simple and user-friendly bit storage and manipulation interface: 

final BitSet bitSet = new BitSet(8); // by default all bits are unset

IntStream.range(0, 8).filter(i -> i % 2 == 0).forEach(bitSet::set); // {0, 2, 4, 6}

bitSet.set(3); // {0, 2, 3, 4, 6}

bitSet.set(3, false); // {0, 2, 4, 6}

final boolean b = bitSet.get(3); // b = false

bitSet.flip(6); // {0, 2, 4}

bitSet.set(100); // {0, 2, 4, 100} - expands automatically

BitSet implements Clonable and Serializable, and under the hood all bit values are stored in long[] words field, that expands automatically.

It also supports whole-set logical operations and, or, xor, andNot: 

bitSet.and(new BitSet(8));
bitSet.or(new BitSet(8));
bitSet.xor(new BitSet(8));
bitSet.andNot(new BitSet(8));
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Bit Manipulation:
* Bit Manipulation
* Checking setting clearing and toggling individual bits. Using long as bit mask
* java.util.BitSet class
* Checking if a number is a power of 2
* Packing unpacking values as bit fragments
* Expressing the power of 2
* Signed vs unsigned shift
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