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A BitSet is a bit container.

An initial size can be set:

	BitSet bs = new BitSet(64);

you can set single bits to true:

	bs.set(1);

It grows if needed:

	// Bit 68 not available, so it automatically grows
	bs.set(68);

It can be filled with a byte array or a long array:

	byte n = 2;
	byte t = 4;
		
	// Fill the Bitset with a byte array
	BitSet bs = BitSet.valueOf(new byte[]{n, t});
		
	// Retrieve the byte array from the BitSet
	byte[] arr = bs.toByteArray();
		
	// Print the byte array returned
	System.out.println(arr[0] + " " + arr[1]);

It can perform logical operations:

		// Define two arrays
		BitSet bs1 = new BitSet();
		BitSet bs2 = new BitSet();

		// Set the active bits to 1
		bs1.set(3);
		bs1.set(4);
		bs2.set(4);
		
		// Logical AND operation
		bs1.and(bs2);

		// Print the active bits after the logical operation
		System.out.println(bs1);