org.apache.logging.log4j.core.util

Class Integers

java.lang.Object

org.apache.logging.log4j.core.util.Integers

public final class Integers
extends Object

Helps deal with integers.

Method Summary

Modifier and Type	Method and Description
static int	ceilingNextPowerOfTwo(int x) Calculate the next power of 2, greater than or equal to x.
static int	parseInt(String s) Parses the string argument as a signed decimal integer.
static int	parseInt(String s, int defaultValue) Parses the string argument as a signed decimal integer.

Methods inherited from class java.lang.Object

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

Method Detail

parseInt

public static int parseInt(String s,
                           int defaultValue)

Parses the string argument as a signed decimal integer.

The input may be surrounded by whitespace.

Parameters:

s - a String containing the int representation to parse, may be null or ""

defaultValue - the return value, use defaultValue if s is null or ""

Returns:

the integer value represented by the argument in decimal.

Throws:

NumberFormatException - if the string does not contain a parsable integer.

parseInt

public static int parseInt(String s)

Parses the string argument as a signed decimal integer.

Parameters:

s - a String containing the int representation to parse, may be null or ""

Returns:

the integer value represented by the argument in decimal.

Throws:

NumberFormatException - if the string does not contain a parsable integer.

ceilingNextPowerOfTwo

public static int ceilingNextPowerOfTwo(int x)

Calculate the next power of 2, greater than or equal to x.

From Hacker's Delight, Chapter 3, Harry S. Warren Jr.

Parameters:

x - Value to round up

Returns:

The next power of 2 from x inclusive