如何将 BitSet 打印为一系列位

Question

Is there a method or a way to print a bitset as series of bits such as 1001011

For example, the following code:

    BitSet b = new BitSet(6);

    b.set(1);
    b.set(3);
    b.set(4);

    // I want to print b like 101100
    System.out.println(b);

Thanks

Answer 1

Just whip up your own code. With StringBuilder, you can do almost any manipulations with collections. Here is a simple implementation:

            BitSet bi = new BitSet(6);

            bi.set(1);
            bi.set(3);
            bi.set(4);
            StringBuilder s = new StringBuilder();
            for( int i = 0; i < bi.length();  i++ )
            {
                s.append( bi.get( i ) == true ? 1: 0 );
            }

            System.out.println( s );

Answer 2

Similar to @funaquarius24 answer, but using java 8 streams:

/**
  * @param bitSet bitset
  * @return "01010000" binary string
  */
public static String toBinaryString(BitSet bitSet) {
  if (bitSet == null) {
    return null;
  }
  return IntStream.range(0, bitSet.length())
      .mapToObj(b -> String.valueOf(bitSet.get(b) ? 1 : 0))
      .collect(Collectors.joining());
}