org.apache.commons.lang

ArrayUtils

Operations on arrays, primitive arrays (like int[]) and primitive wrapper arrays (like Integer[]).

BitField

Operations on bit-mapped fields.

BooleanUtils

Operations on boolean primitives and Boolean objects.

CharRange

A contiguous range of characters, optionally negated.

CharSet

A set of characters.

CharSetUtils

Operations on CharSets.

ClassUtils

Operates on classes without using reflection.

ObjectUtils

Operations on Object.

ObjectUtils.Null

Class used as a null placeholder where null has another meaning.

RandomStringUtils

Operations for random strings.

SerializationUtils

Assists with the serialization process and performs additional functionality based on serialization.

StringEscapeUtils

Escapes and unescapes strings for Java, Java Script, HTML, XML, and SQL.

StringUtils

Operations on String that are null safe.

SystemUtils

Helpers for java.lang.System.

Validate

Assists in validating arguments.

WordUtils

Operations on strings that contain words.