BitSet to and from integer/long

Question

If I have an integer that I'd like to perform bit manipulation on, how can I load it into a java.util.BitSet? How can I convert it back to an int or long? I'm not so concerned about the size of the BitSet -- it will always be 32 or 64 bits long. I'd just like to use the set(), clear(), nextSetBit(), and nextClearBit() methods rather than bitwise operators, but I can't find an easy way to initialize a bit set with a numeric type.

Answer 1

Isn't the public void set(int bit) method what your looking for?

Answer 2

The following code creates a bit set from a long value:

long value = ...;
BitSet bits = new BitSet(Long.SIZE);
int index = 0;
while (value != 0L) {
  if (value % 1L != 0) {
    bits.set(index);
  }
  ++index;
  value = value >>> 1;
}