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• org.apache.commons.lang.enums: Javadoc index of package org.apache.commons.lang.enums.


Package Samples:

• org.apache.commons.lang.enums

Classes:

• Enum: Abstract superclass for type-safe enums. One feature of the C programming language lacking in Java is enumerations. The C implementation based on ints was poor and open to abuse. The original Java recommendation and most of the JDK also uses int constants. It has been recognised however that a more robust type-safe class-based solution can be designed. This class follows the basic Java type-safe enumeration pattern. NOTE: Due to the way in which Java ClassLoaders work, comparing Enum objects should always be done using equals() , not == . The equals() method will try == first so in most cases the ...
• ValuedEnum: Abstract superclass for type-safe enums with integer values suitable for use in switch statements. NOTE: Due to the way in which Java ClassLoaders work, comparing Enum objects should always be done using the equals() method, not == . The equals() method will try == first so in most cases the effect is the same. To use this class, it must be subclassed. For example: public final class JavaVersionEnum extends ValuedEnum { //standard enums for version of JVM public static final int JAVA1_0_VALUE = 100; public static final int JAVA1_1_VALUE = 110; public static final int JAVA1_2_VALUE = 120; public ...
• NestLinked: Color enumeration which demonstrates how to define the constants in a different class to the Enum. The extra static{} block is needed to ensure that the enum constants are created before the static methods on the ColorEnum are used. The class loader sees the two classes here as independent - the enum class is nested, not an inner class. The static block thus forces the class load of the outer class, which is needed to initialise the enums.
• NestBroken: Color enumeration which demonstrates how to break the enum system. The class loader sees the two classes here as independent - the enum class is nested, not an inner class. Calling getEnumList() on ColorEnum will return an empty list, unless and until the NestBroken class is referenced.
• NestReferenced: Color enumeration which demonstrates how to provide a view of the constants in a different class to the Enum. This technique is the safest, however it is obviously inconvenient as it involves defining two sets of constants. See NestedLinked for an alternative.
• EnumEqualsTest: Test cases for the EnumEqualsTest.CarColorEnum class equals method.
• EnumUtils: Utility class for accessing and manipulating Enum s.
• Nest: Color enumeration demonstrating a normal simple nesting case. All is well here as the nested enum class is really no different to any other class.
• EnumTest: Test cases for the Enum class.
• EnumUtilsTest: Test cases for the Enum class.
• ValuedEnumTest: Test cases for the Enum class.
• Broken5OperationEnum: Broken Operator enumeration, getEnumClass() is not an Enum class.
• Broken4OperationEnum: Broken Operator enumeration, getEnumClass() is ValuedEnum.class.
• Broken2OperationEnum: Broken Operator enumeration, getEnumClass() not superclass.
• Broken3OperationEnum: Broken Operator enumeration, getEnumClass() is Enum.class.
• Broken1OperationEnum: Broken Operator enumeration, null class.
• EnumTestSuite: Test suite for the Enum package.
• DummyEnum: Dummy enumeration - no values.
• Extended1Enum: Base extended enumeration.
• Broken1Enum: Broken color enumeration.
• Broken2Enum: Broken color enumeration.
• Broken3Enum: Broken color enumeration.
• Extended2Enum: Extended enumeration.
• Extended3Enum: Extended enumeration.

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