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Method and Constructor Formal Type Parameters 13413
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removing a type parameter does not, in itself, have any implications for binary compatibility
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Note that if such type variables are used in the type of the method or constructor, that may have the normal implications of changing the aforementioned type
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Changing the rst bound of a type parameter may change the erasure ( 46) of any member that uses that type variable in its own type, and this may effect binary compatibility Speci cally: If the type parameter is used as the type of a eld, the effect is as if the eld was removed and a eld with the same name, whose type is the new erasure of the type variable, was added
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If the type variable is used as a return type of a method, but not as the type of any formal parameter of the method, the effect is as if that method were removed, and replaced with a new method that is identical except for the return type, which is now the new erasure of the type variable If the type variable is used as a return type of a method and as the type of some formal paramters of the method, the effect is as if that method were removed, and replaced with a new method that is identical except for the return type, which is now the new erasure of the type variable, and except for the types of the aforementioned formal parameters, which now have the new erasure of the type variable as their type Changing any other bound has no effect on binary compatibility
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If the type variable is used as the type of any formal parameter of a method, but not as the return type, the effect is as if that method were removed, and replaced with a new method that is identical except for the types of the aforementioned formal parameters, which now have the new erasure of the type variable as their type
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13414 Method and Constructor Parameters Changing the name of a formal parameter of a method or constructor does not impact pre-existing binaries Changing the name of a method, the type of a formal parameter to a method or constructor, or adding a parameter to or deleting a parameter from a method or constructor declaration creates a method or constructor with a new signature, and has the combined effect of deleting the method or constructor with the old signature and adding a method or constructor with the new signature (see 13412) For purposes of binary compatibility, adding or removing a method or constructor m whose signature involves type variables ( 44) or parameterized types ( 45) is equivalent to the addition (respectively, removal) of an otherwise equivalent method whose signature is the erasure ( 46) of the signature of m
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13415 Method Result Type
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Changing a method that is declared abstract to no longer be declared abstract does not break compatibility with pre-existing binaries Changing a method that is not declared abstract to be declared abstract will break compatibility with pre-existing binaries that previously invoked the method, causing an AbstractMethodError If the example program:
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class Super { void out() { Systemoutprintln("Out"); } }
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Changing the result type of a method, replacing a result type with void, or replacing void with a result type has the combined effect of deleting the old method and adding a new method with the new result type or newly void result (see 13412) For purposes of binary compatibility, adding or removing a method or constructor m whose return type involves type variables ( 44) or parameterized types ( 45) is equivalent to the addition (respectively, removal) of the an otherwise equivalent method whose return type is the erasure ( 46) of the return type of m
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