스위치환경에서스니핑 › 마크업언어의구성요소 › 한글 › tomcat › classpath › BitSetTest
package zzz.bitsettest; import java.util.BitSet; public class BitSetTest { public static void main(String[] args) { System.out.println("Integer.MAX_VALUE = " + Integer.MAX_VALUE); System.out.println("----"); BitSet bits = new BitSet(2000000000); bits.set(0); bits.set(1); bits.set(2); bits.set(0); bits.set(7); bits.set(8); bits.set(9); System.out.println(bits); System.out.println("cardinality = " + bits.cardinality()); System.out.println("first clean bit = " + bits.nextClearBit(0)); System.out.println("----"); for (int i = 0; i < 2000000000; i++) bits.set(i); int idxToClear = 2000000000 - 5; bits.clear(idxToClear); System.out.println("cardinality = " + bits.cardinality()); System.out.println("first clean bit = " + bits.nextClearBit(0)); } }
- output
Integer.MAX_VALUE = 2147483647 ---- {0, 1, 2, 7, 8, 9} cardinality = 6 first clean bit = 3 ---- cardinality = 1999999999 first clean bit = 1999999995