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The value of a class instance creation expression is a reference to the newly created object of the speci ed class Every time the expression is evaluated, a fresh object is created 1595 Anonymous Class Declarations An anonymous class declaration is automatically derived from a class instance creation expression by the compiler An anonymous class is never abstract ( 8111) An anonymous class is always an inner class ( 813); it is never static ( 811, 852) An anonymous class is always implicitly final ( 8112) 15951 Anonymous Constructors
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An anonymous class cannot have an explicitly declared constructor Instead, the compiler must automatically provide an anonymous constructor for the anonymous class The form of the anonymous constructor of an anonymous class C with direct superclass S is as follows:
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The body of the constructor consists of an explicit constructor invocation ( 8871) of the form super(), where the actual arguments are the formal parameters of the constructor, in the order they were declared Otherwise, the rst formal parameter of the constructor of C represents the value of the immediately enclosing instance of i with respect to S The type of this parameter is the class type that immediately encloses the declaration of S The constructor has an additional formal parameter for each actual argument to the class instance creation expression that declared the anonymous class The nth formal parameter e corresponds to the n 1 st actual argument The actual arguments to the class instance creation expression are used to determine a constructor cs of S, using the same rules as for method invocations ( 1512) The type of each formal parameter of the anonymous constructor must be identical to the corresponding formal parameter of cs The body of the constructor consists of an explicit constructor invocation ( 8871) of the form osuper(), where o is the rst formal parameter of the constructor, and
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If S is not an inner class, or if S is a local class that occurs in a static context, then the anonymous constructor has one formal parameter for each actual argument to the class instance creation expression in which C is declared The actual arguments to the class instance creation expression are used to determine a constructor cs of S, using the same rules as for method invocations ( 1512) The type of each formal parameter of the anonymous constructor must be identical to the corresponding formal parameter of cs
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1596 Example: Evaluation Order and Out-of-Memory Detection
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the actual arguments are the subsequent formal parameters of the constructor, in the order they were declared In all cases, the throws clause of an anonymous constructor must list all the checked exceptions thrown by the explicit superclass constructor invocation statement contained within the anonymous constructor, and all checked exceptions thrown by any instance initializers or instance variable initializers of the anonymous class Note that it is possible for the signature of the anonymous constructor to refer to an inaccessible type (for example, if such a type occurred in the signature of the superclass constructor cs) This does not, in itself, cause any errors at either compile time or run time 1596 Example: Evaluation Order and Out-of-Memory Detection
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class List { int value; List next; static List head = new List(0); List(int n) { value = n; next = head; head = this; } } class Test { public static void main(String[] args) { int id = 0, oldid = 0; try { for (;;) { ++id; new List(oldid = id); } } catch (Error e) { Systemoutprintln(e + ", " + (oldid==id)); } } } javalangOutOfMemoryError: List, false
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because the out-of-memory condition is detected before the argument expression oldid = id is evaluated
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If evaluation of a class instance creation expression nds there is insuf cient memory to perform the creation operation, then an OutOfMemoryError is thrown This check occurs before any argument expressions are evaluated So, for example, the test program:
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