Here you can find the source of convert(BitSet bits)
public static int convert(BitSet bits)
//package com.java2s; /*//ww w . j av a 2s.c o m * Copyright 2014 8Kdata Technology * * 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 { public static int convert(BitSet bits) { assert bits.length() <= 32; int value = 0; for (int i = 0; i < bits.length(); ++i) { value += bits.get(i) ? 1 << i : 0; } return value; } public static BitSet convert(int value) { BitSet bits = new BitSet(); int index = 0; while (value != 0) { if (value % 2 != 0) { bits.set(index); } ++index; value = value >>> 1; } return bits; } }