A symbolic reference to the type of each parameter in Java

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Every member type must have suf cient information to recover its source level access modi er Every nested class must have a symbolic reference to its immediately enclosing class Every class that contains a nested class must contain symbolic references to all of its member classes, and to all local and anonymous classes that appear in its methods, constructors and static or instance initializers
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A change to a type is binary compatible with (equivalently, does not break binary compatibility with) preexisting binaries if preexisting binaries that previously linked without error will continue to link without error Binaries are compiled to rely on the accessible members and constructors of other classes and interfaces To preserve binary compatibility, a class or interface should treat its accessible members and constructors, their existence and behavior, as a contract with its users The Java programming language is designed to prevent additions to contracts and accidental name collisions from breaking binary compatibility; speci cally: Addition of more methods overloading a particular method name does not break compatibility with preexisting binaries The method signature that the preexisting binary will use for method lookup is chosen by the method overload resolution algorithm at compile time ( 15122) (If the language had been designed so that the particular method to be executed was chosen at run time, then such an ambiguity might be detected at run time Such a rule would imply that adding an additional overloaded method so as to make ambiguity possible at a call site could break compatibility with an unknown number of preexisting binaries See 13423 for more discussion)
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Binary compatibility is not the same as source compatibility In particular, the example in 1346 shows that a set of compatible binaries can be produced from
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The following sections discuss changes that may be made to class and interface type declarations without breaking compatibility with pre-existing binaries Under the translation requirements given above, the Java virtual machine and its class le format support these changes Any other valid binary format, such as a compressed or encrypted representation that is mapped back into class les by a class loader under the above requirements will necessarily support these changes as well
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sources that will not compile all together This example is typical: a new declaration is added, changing the meaning of a name in an unchanged part of the source code, while the preexisting binary for that unchanged part of the source code retains the fully-quali ed, previous meaning of the name Producing a consistent set of source code requires providing a quali ed name or eld access expression corresponding to the previous meaning
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A new top-level class or interface type may be added to a package without breaking compatibility with pre-existing binaries, provided the new type does not reuse a name previously given to an unrelated type If a new type reuses a name previously given to an unrelated type, then a con ict may result, since binaries for both types could not be loaded by the same class loader Changes in top-level class and interface types that are not public and that are not a superclass or superinterface, respectively, of a public type, affect only types within the package in which they are declared Such types may be deleted or otherwise changed, even if incompatibilities are otherwise described here, provided that the affected binaries of that package are updated together
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This section describes the effects of changes to the declaration of a class and its members and constructors on pre-existing binaries 1341 abstract Classes
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If a class that was not abstract is changed to be declared abstract, then preexisting binaries that attempt to create new instances of that class will throw either an InstantiationError at link time, or (if a re ective method is used) an InstantiationException at run time; such a change is therefore not recommended for widely distributed classes Changing a class that was declared abstract to no longer be declared abstract does not break compatibility with pre-existing binaries 1342 final Classes If a class that was not declared final is changed to be declared final, then a VerifyError is thrown if a binary of a pre-existing subclass of this class is
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