Here you can find the source of bitSetOf(long lowerBits, long upperBits)
static BitSet bitSetOf(long lowerBits, long upperBits)
//package com.java2s; /*/*from ww w . j ava2 s . com*/ * Copyright 2013 Jan Van Besien * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.util.BitSet; public class Main { static BitSet bitSetOf(long lowerBits, long upperBits) { final BitSet bitSet = new BitSet(); convert(lowerBits, 0, bitSet); convert(upperBits, Long.SIZE, bitSet); return bitSet; } static void convert(long value, int bitSetOffset, BitSet bits) { int index = 0; while (value != 0L) { if (value % 2L != 0) { bits.set(bitSetOffset + index); } ++index; value = value >>> 1; } } }