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Apache Commons Lang
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"The standard Java libraries fail to provide enough methods for manipulation of
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its core classes. The Lang Component provides these extra methods. The Lang
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Component provides a host of helper utilities for the java.lang API, notably
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String manipulation methods, basic numerical methods, object reflection,
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creation and serialization, and System properties. Additionally it contains
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an inheritable enum type, an exception structure that supports multiple types
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of nested-Exceptions, basic enhancements to java.util.Date and a series of
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utlities dedicated to help with building methods, such as hashCode, toString
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and equals."
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For more information:
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http://commons.apache.org/lang/
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