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Initialize Test: Execute Initializers
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1213 Initialize Test: Execute Initializers
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In our continuing example, the virtual machine is still trying to execute the method main of class Test This is permitted only if the class has been initialized ( 1241) Initialization consists of execution of any class variable initializers and static initializers of the class Test, in textual order But before Test can be initialized, its direct superclass must be initialized, as well as the direct superclass of its direct superclass, and so on, recursively In the simplest case, Test has Object as its implicit direct superclass; if class Object has not yet been initialized, then it must be initialized before Test is initialized Class Object has no superclass, so the recursion terminates here If class Test has another class Super as its superclass, then Super must be initialized before Test This requires loading, verifying, and preparing Super if this has not already been done and, depending on the implementation, may also involve resolving the symbolic references from Super and so on, recursively Initialization may thus cause loading, linking, and initialization errors, including such errors involving other types The initialization process is described further in 124
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has been done for many years in simple implementations of the C language (In these implementations, a compiled program is typically represented as an aout le that contains a fully-linked version of the program, including completely resolved links to library routines used by the program Copies of these library routines are included in the aout le) An implementation may instead choose to resolve a symbolic reference only when it is actively used; consistent use of this strategy for all symbolic references would represent the laziest form of resolution In this case, if Test had several symbolic references to another class, then the references might be resolved one at a time, as they are used, or perhaps not at all, if these references were never used during execution of the program The only requirement on when resolution is performed is that any errors detected during resolution must be thrown at a point in the program where some action is taken by the program that might, directly or indirectly, require linkage to the class or interface involved in the error Using the static example implementation choice described above, loading and linkage errors could occur before the program is executed if they involved a class or interface mentioned in the class Test or any of the further, recursively referenced, classes and interfaces In a system that implemented the laziest resolution, these errors would be thrown only when an incorrect symbolic reference is actively used The resolution process is described further in 1233
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1214 Invoke Testmain
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1214 Invoke Testmain Finally, after completion of the initialization for class Test (during which other consequential loading, linking, and initializing may have occurred), the method main of Test is invoked The method main must be declared public, static, and void It must accept a single argument that is an array of strings This method can be declared as either
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122 Loading of Classes and Interfaces
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Loading refers to the process of nding the binary form of a class or interface type with a particular name, perhaps by computing it on the y, but more typically by retrieving a binary representation previously computed from source code by a compiler, and constructing, from that binary form, a Class object to represent the class or interface The precise semantics of loading are given in chapter 5 of The Java Virtual Machine Speci cation (whenever we refer to the Java virtual machine speci cation in this book, we mean the second edition, as amended by JSR 924) Here we present an overview of the process from the viewpoint of the Java programming language The binary format of a class or interface is normally the class le format described in The Java Virtual Machine Speci cation cited above, but other formats are possible, provided they meet the requirements speci ed in 131 The method defineClass of class ClassLoader may be used to construct Class objects from binary representations in the class le format Well-behaved class loaders maintain these properties: Given the same name, a good class loader should always return the same class object If a class loader L1 delegates loading of a class C to another loader L2, then for any type T that occurs as the direct superclass or a direct superinterface of C, or as the type of a eld in C, or as the type of a formal parameter of a method or constructor in C, or as a return type of a method in C, L1 and L2 should return the same class object
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