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This implies that it is impossible to de ne a local ( 143) enum, or to de ne an enum in an inner class ( 813)
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/** * Returns an array containing the constants of this enum * type, in the order they re declared This method may be * used to iterate over the constants as follows: * * for(E c : Evalues()) * Systemoutprintln(c); * * @return an array containing the constants of this enum * type, in the order they re declared */ public static E[] values(); /** * Returns the enum constant of this type with the specified * name * The string must match exactly an identifier used to declare * an enum constant in this type (Extraneous whitespace * characters are not permitted) * * @return the enum constant with the specified name
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Any constructor or member declarations within an enum declaration apply to the enum type exactly as if they had been present in the class body of a normal class declaration unless explicitly stated otherwise The direct superclass of an enum type named E is Enum<E> In addition to the members it inherits from Enum<E>, for each declared enum constant with the name n the enum type has an implicitly declared public static final eld named n of type E These elds are considered to be declared in the same order as the corresponding enum constants, before any static elds explicitly declared in the enum type Each such eld is initialized to the enum constant that corresponds to it Each such eld is also considered to be annotated by the same annotations as the corresponding enum constant The enum constant is said to be created when the corresponding eld is initialized It is a compile-time error for an enum to declare a nalizer An instance of an enum may never be nalized In addition, if E is the name of an enum type, then that type has the following implicitly declared static methods:
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* @throws IllegalArgumentException if this enum type has no * constant with the specified name */ public static E valueOf(String name);
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Without this rule, apparently reasonable code would fail at run time due to the initialization circularity inherent in enum types (A circularity exists in any class with a "self-typed" static eld) Here is an example of the sort of code that would fail:
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enum Color { RED, GREEN, BLUE; static final Map<String,Color> colorMap = new HashMap<String,Color>(); Color() { colorMapput(toString(), this); } }
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Static initialization of this enum type would throw a NullPointerException because the static variable colorMap is uninitialized when the constructors for the enum constants run The restriction above ensures that such code won t compile
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It is a compile-time error to reference a static eld of an enum type that is not a compile-time constant ( 1528) from constructors, instance initializer blocks, or instance variable initializer expressions of that type It is a compile-time error for the constructors, instance initializer blocks, or instance variable initializer expressions of an enum constant e to refer to itself or to an enum constant of the same type that is declared to the right of e
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It follows that enum type declarations cannot contain elds that con ict with the enum constants, and cannot contain methods that con ict with the automatically generated methods (values() and valueOf(String)) or methods that override the nal methods in Enum: (equals(Object), hashCode(), clone(), compareTo(Object), name(), ordinal(), and getDeclaringClass())
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Note that the example can easily be refactored to work properly:
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enum Color { RED, GREEN, BLUE; static final Map<String,Color> colorMap = new HashMap<String,Color>(); static { for (Color c : Colorvalues()) colorMapput(ctoString(), c); } }
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