Commons Lang、BitField#isAllSet()
import org.apache.commons.lang.BitField; public class C2009042700 { public static void main(String[] args) { BitField bf; bf = new BitField(5); System.out.println(bf.isAllSet(15)); bf = new BitField(7); System.out.println(bf.isAllSet(15)); bf = new BitField(7); System.out.println(bf.isAllSet(7)); bf = new BitField(15); System.out.println(bf.isAllSet(7)); } }
で、
true true true false