org.nutz.lang
类 Maths

java.lang.Object
  org.nutz.lang.Maths

public abstract class Maths
extends java.lang.Object

A group of helper functions to counting some ...

作者：

zozoh(zozohtnt@gmail.com)

构造方法摘要

Maths()

方法摘要

static int	bit(java.lang.String s) Convert a binary string to a integer
static int	extract(int bs, int low, int high) Get part of one integer as a new integer
static boolean	isMask(int bs, int mask) Test current bit is match the given mask at least one bit or not.
static boolean	isMaskAll(int bs, int mask) Test current bit is all match the give mask.
static boolean	isNoMask(int bs, int mask)
static int	max(int... nums) Seek the maximum number from an INT array

从类 java.lang.Object 继承的方法

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造方法详细信息

Maths

public Maths()

方法详细信息

max

public static int max(int... nums)

Seek the maximum number from an INT array

参数：

nums - INT array

返回：

the maximum

bit

public static int bit(java.lang.String s)

Convert a binary string to a integer

参数：

s - binary string

返回：

integer

isMask

public static boolean isMask(int bs,
                             int mask)

Test current bit is match the given mask at least one bit or not.

参数：

bs - integer, bit map

mask - another bit map

返回：

if one of bit value is '1' in mask, and it is also is '1' in bs return true, else false

isNoMask

public static boolean isNoMask(int bs,
                               int mask)

isMaskAll

public static boolean isMaskAll(int bs,
                                int mask)

Test current bit is all match the give mask.

参数：

bs - integer, bit map

mask - another bit map

返回：

if all bit value is '1' in mask, and it is also is '1' in bs return true, else false

extract

public static int extract(int bs,
                          int low,
                          int high)

Get part of one integer as a new integer

参数：

bs - original integer

low - the low bit position (inclusive), 0 base

high - the hight bit position (exclusive), 0 base

返回：

new integer