Converting Between a BitSet and a Byte Array

  

import java.util.BitSet;

public class Main {
  public static void main(String[] argv) throws Exception {
     System.out.println(fromByteArray(new byte[]{1,2,3}));
  }

  // Returns a bitset containing the values in bytes.
  public static BitSet fromByteArray(byte[] bytes) {
    BitSet bits = new BitSet();
    for (int i = 0; i < bytes.length * 8; i++) {
      if ((bytes[bytes.length - i / 8 - 1] & (1 << (i % 8))) > 0) {
        bits.set(i);
      }
    }
    return bits;
  }
}
//{0, 1, 9, 16}

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Converting Between a BitSet and a Byte Array : Binary Bit « Language Basics « Java

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