Here you can find the source of countBits(int i)
| Parameter | Description |
|---|---|
| i | a parameter |
public static int countBits(int i)
//package com.java2s; /*//from w w w. jav a 2 s. c o m * Copyright 2015 bladesilent@gmail.com * * 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. * */ public class Main { /** * Count the number of non-zero bits of a integer * * @param i * @return */ public static int countBits(int i) { i = (((i & 0xAAAAAAAA) >>> 1) + (i & 0x55555555)); i = (((i & 0xCCCCCCCC) >>> 2) + (i & 0x33333333)); i = (((i & 0xF0F0F0F0) >>> 4) + (i & 0x0F0F0F0F)); i = (((i & 0xFF00FF00) >>> 8) + (i & 0x00FF00FF)); i = (((i & 0xFFFF0000) >>> 16) + (i & 0x0000FFFF)); return i; } /** * Cont the number of non-zero bits of a short * * @param i * @return */ public static int countBits(short i) { i = (short) (((i & 0xAAAA) >>> 1) + (i & 0x5555)); i = (short) (((i & 0xCCCC) >>> 2) + (i & 0x3333)); i = (short) (((i & 0xF0F0) >>> 4) + (i & 0x0F0F)); i = (short) (((i & 0xFF00) >>> 8) + (i & 0x00FF)); return i; } }