bitmap算法

import java.util.BitSet;  
  
public class  {  
      public static void main(String[] args) {
          
          BitSet bitSet = new BitSet(100);
  
          bitSet.set(1, true);
          bitSet.set(3, true);
          bitSet.set(6, true);
          bitSet.set(100, true);
  
          for (int i = 0; i < bitSet.size(); i++) {
              boolean b = bitSet.get(i);
  
              if (b) {
                  System.out.println(i);
              }
          }
      }
}