The standard Java libraries fail to provide enough methods for manipulation of its core classes. Apache Commons Lang provides these extra methods.

Lang provides a host of helper utilities for the java.lang API, notably String manipulation methods, basic numerical methods, object reflection, concurrency, creation and serialization and System properties. Additionally it contains basic enhancements to java.util.Date and a series of utilities dedicated to help with building methods, such as hashCode, toString and equals.

JAR File Size and Download Location:

File name: commons-lang3.jar, commons-lang3-3.1.jar
File size: 315805 bytes
Date modified: 09-Nov-2011
Download: Apache Commons Lang

Manifest of the JAR:

Archiver-Version: Plexus Archiver
Built-By: hen
Build-Jdk: 1.5.0_22
Implementation-Build: UNKNOWN_BRANCH@r??????; 2011-11-09 22:58:07-0800
Implementation-Title: Commons Lang
Implementation-Vendor: The Apache Software Foundation
Implementation-Vendor-Id: org.apache
Implementation-Version: 3.1
Specification-Title: Commons Lang
Specification-Vendor: The Apache Software Foundation
Specification-Version: 3.1
X-Compile-Source-JDK: 1.5
X-Compile-Target-JDK: 1.5
Bundle-License: http://www.apache.org/licenses/LICENSE-2.0.txt
Include-Resource: templates/release-notes.vm=src/main/resources/templa
 tes/release-notes.vm,META-INF/LICENSE.txt=LICENSE.txt,META-INF/NOTICE
 .txt=NOTICE.txt
Bnd-LastModified: 1320908300777
Export-Package: org.apache.commons.lang3.event;version="3.1",org.apach
 e.commons.lang3.mutable;version="3.1",org.apache.commons.lang3.tuple;
 version="3.1",org.apache.commons.lang3.time;version="3.1",org.apache.
 commons.lang3.concurrent;version="3.1",org.apache.commons.lang3.text.
 translate;version="3.1",org.apache.commons.lang3.text;version="3.1",o
 rg.apache.commons.lang3.math;version="3.1",org.apache.commons.lang3;v
 ersion="3.1",org.apache.commons.lang3.exception;v

List of Classes in the JAR:

org/apache/commons/lang3/ClassUtils
org/apache/commons/lang3/EnumUtils
org/apache/commons/lang3/SerializationUtils
org/apache/commons/lang3/time/StopWatch
org/apache/commons/lang3/time/DateUtils
org/apache/commons/lang3/time/FastDateFormat
org/apache/commons/lang3/time/DateFormatUtils
org/apache/commons/lang3/time/FormatCache
org/apache/commons/lang3/time/DurationFormatUtils
org/apache/commons/lang3/CharRange
org/apache/commons/lang3/ObjectUtils
org/apache/commons/lang3/StringUtils
org/apache/commons/lang3/tuple/ImmutablePair
org/apache/commons/lang3/tuple/MutablePair
org/apache/commons/lang3/tuple/Pair
org/apache/commons/lang3/BooleanUtils
org/apache/commons/lang3/SystemUtils
org/apache/commons/lang3/StringEscapeUtils
org/apache/commons/lang3/concurrent/TimedSemaphore
org/apache/commons/lang3/concurrent/CallableBackgroundInitializer
org/apache/commons/lang3/concurrent/AtomicSafeInitializer
org/apache/commons/lang3/concurrent/ConstantInitializer
org/apache/commons/lang3/concurrent/ConcurrentInitializer
org/apache/commons/lang3/concurrent/MultiBackgroundInitializer
org/apache/commons/lang3/concurrent/ConcurrentRuntimeException
org/apache/commons/lang3/concurrent/LazyInitializer
org/apache/commons/lang3/concurrent/BasicThreadFactory
org/apache/commons/lang3/concurrent/ConcurrentUtils
org/apache/commons/lang3/concurrent/ConcurrentException
org/apache/commons/lang3/concurrent/AtomicInitializer
org/apache/commons/lang3/concurrent/BackgroundInitializer
org/apache/commons/lang3/CharEncoding
org/apache/commons/lang3/CharSequenceUtils
org/apache/commons/lang3/exception/ExceptionContext
org/apache/commons/lang3/exception/DefaultExceptionContext
org/apache/commons/lang3/exception/ContextedRuntimeException
org/apache/commons/lang3/exception/ContextedException
org/apache/commons/lang3/exception/CloneFailedException
org/apache/commons/lang3/exception/ExceptionUtils
org/apache/commons/lang3/SerializationException
org/apache/commons/lang3/builder/ReflectionToStringBuilder
org/apache/commons/lang3/builder/IDKey
org/apache/commons/lang3/builder/ToStringStyle
org/apache/commons/lang3/builder/CompareToBuilder
org/apache/commons/lang3/builder/ToStringBuilder
org/apache/commons/lang3/builder/Builder
org/apache/commons/lang3/builder/EqualsBuilder
org/apache/commons/lang3/builder/HashCodeBuilder
org/apache/commons/lang3/builder/StandardToStringStyle
org/apache/commons/lang3/CharSetUtils
org/apache/commons/lang3/Validate
org/apache/commons/lang3/CharUtils
org/apache/commons/lang3/AnnotationUtils
org/apache/commons/lang3/event/EventListenerSupport
org/apache/commons/lang3/event/EventUtils
org/apache/commons/lang3/BitField
org/apache/commons/lang3/CharSet
org/apache/commons/lang3/text/translate/CharSequenceTranslator
org/apache/commons/lang3/text/translate/AggregateTranslator
org/apache/commons/lang3/text/translate/CodePointTranslator
org/apache/commons/lang3/text/translate/NumericEntityEscaper
org/apache/commons/lang3/text/translate/LookupTranslator
org/apache/commons/lang3/text/translate/EntityArrays
org/apache/commons/lang3/text/translate/NumericEntityUnescaper
org/apache/commons/lang3/text/translate/OctalUnescaper
org/apache/commons/lang3/text/translate/UnicodeUnescaper
org/apache/commons/lang3/text/translate/UnicodeEscaper
org/apache/commons/lang3/text/WordUtils
org/apache/commons/lang3/text/FormatFactory
org/apache/commons/lang3/text/StrTokenizer
org/apache/commons/lang3/text/FormattableUtils
org/apache/commons/lang3/text/StrSubstitutor
org/apache/commons/lang3/text/StrMatcher
org/apache/commons/lang3/text/StrBuilder
org/apache/commons/lang3/text/StrLookup
org/apache/commons/lang3/text/ExtendedMessageFormat
org/apache/commons/lang3/text/CompositeFormat
org/apache/commons/lang3/mutable/MutableInt
org/apache/commons/lang3/mutable/MutableShort
org/apache/commons/lang3/mutable/Mutable
org/apache/commons/lang3/mutable/MutableFloat
org/apache/commons/lang3/mutable/MutableLong
org/apache/commons/lang3/mutable/MutableDouble
org/apache/commons/lang3/mutable/MutableObject
org/apache/commons/lang3/mutable/MutableBoolean
org/apache/commons/lang3/mutable/MutableByte
org/apache/commons/lang3/RandomStringUtils
org/apache/commons/lang3/math/Fraction
org/apache/commons/lang3/math/NumberUtils
org/apache/commons/lang3/math/IEEE754rUtils
org/apache/commons/lang3/reflect/MethodUtils
org/apache/commons/lang3/reflect/MemberUtils
org/apache/commons/lang3/reflect/ConstructorUtils
org/apache/commons/lang3/reflect/TypeUtils
org/apache/commons/lang3/reflect/FieldUtils
org/apache/commons/lang3/ArrayUtils
org/apache/commons/lang3/LocaleUtils
org/apache/commons/lang3/Range
org/apache/commons/lang3/JavaVersion