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13411 transient Fields Adding or deleting a transient modi er of a eld does not break compatibility with pre-existing binaries 13412 Method and Constructor Declarations Adding a method or constructor declaration to a class will not break compatibility with any pre-existing binaries, in the case where a type could no longer be recompiled because an invocation previously referenced a method or constructor of a superclass with an incompatible type The previously compiled class with such a reference will continue to reference the method or constructor declared in a superclass Assume a reference to a method m with qualifying type T Assume further that m is in fact an instance (respectively static) method declared in a superclass of T, S If a new method of type X with the same signature and return type as m is added to a subclass of S that is a superclass of T or T itself, then a linkage error may occur Such a linkage error will occur only if, in addition to the above, either one of the following conditions hold: The new method is less accessible than the old one The new method is a static (respectively instance) method Deleting a method or constructor from a class may break compatibility with any pre-existing binary that referenced this method or constructor; a NoSuchMethodError may be thrown when such a reference from a pre xisting binary is linked Such an error will occur only if no method with a matching signature and return type is declared in a superclass If the source code for a class contains no declared constructors, the Java compiler automatically supplies a constructor with no parameters Adding one or more constructor declarations to the source code of such a class will prevent this default constructor from being supplied automatically, effectively deleting a constructor, unless one of the new constructors also has no parameters, thus replacing the default constructor The automatically supplied constructor with no parameters is given the same access modi er as the class of its declaration, so any replacement should have as much or more access if compatibility with pre-existing binaries is to be preserved 13413 Method and Constructor Formal Type Parameters Renaming a type variable ( 44) declared as a formal type parameter of a method or constructor has no effect with respect to pre-existing binaries Adding or 350. vb.net barcode scanner tutorial Using Barcode Reader In VB.NET | Free Source Code & Tutorials
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