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Download Programming for the Java™ Virtual Machine by Joshua Engel PDF

By Joshua Engel

The center of Java expertise, the Java digital laptop is an summary computing computing device that permits the Java platform to host purposes on any computing device or working approach with out rewriting or recompiling. an individual attracted to designing a language or writing a compiler for the Java digital laptop should have an in-depth realizing of its binary type layout and guide set. while you are programming with the Java programming language, wisdom of the Java digital desktop provide you with beneficial perception into the Java platform's protection services and cross-platform portability. it's going to elevate your figuring out of the Java programming language, allowing you to enhance the protection and function of your courses. the writer employs an instructional technique that offers a close look at the principal workings of the know-how and teaches the reader the right way to write genuine courses for the Java digital computer. He describes equipment for changing into a greater programmer via a sophisticated knowing of the Java digital laptop and Java know-how. Programming for the Java digital computer bargains finished insurance of all of the significant components of the Java digital computer - sessions and gadgets, regulate directions, debugging, classification loaders, compiling the Java programming language, functionality concerns, protection, and threads and synchronization. The booklet presents an advent to the Java digital desktop Specification (JVMS), with a set of issues that support programmers comprehend the Java digital laptop and the JVMS larger. furthermore, the booklet positive factors implementations of Prolog and Scheme, a language that runs on most sensible of the Java digital computing device, producing Java digital computer code because it runs and utilizing a Java digital computing device classification loader to load the generated code into the procedure. you can find exact details on such themes as: The Java digital desktop verification set of rules How Java digital computing device protection works, and what it might probably and cannot do utilizing type loaders to include code and dynamically generated code from the net, the Java starting place sessions, database queries, and different languages The mechanics of compiling the Java programming language for the Java digital laptop enforcing different languages utilizing the Java digital desktop, together with Scheme, Prolog, Sather, Eiffel, and commonplace expressions

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Thus, if the program contains the instruction lload 7 it knows that at least nine variables are used (variables 0 through 7 plus one more, since the lload instruction affects both variables 7 and 8). Measuring the maximum height of the stack just from looking at the code is a little harder, but it can be done. The enforcement is the job of the verification algorithm. See chapter 6 for more information about the verification algorithm. method println(J)V This is called method overloading. In Oolong, when a method is called you must specify the entire descriptor, including the return type.

Implement another method that does a barrel shift left by 1. 8 Bitwise operations are often used to represent sets. Build a collection of methods that uses an int as a set. Implement the following operations: boolean test(int set, int x) // Return 1 if bit x is set int set(int set, int x, boolean v) // Set the x-th bit to v . 4 Floating-Point Arithmetic and strictfp The biggest change for the Java 2 platform to the JVM itself is the introduction of the strictfp bit in methods and classes. Certain computer architectures use wider floating-point representations than the original JVM specification calls for.

Furthermore, you have specified what sort of object it must be: it must be either an instance of Foo or one of the subclasses of Foo. The exact type of the object cannot be determined until the program is run. A reference takes a single slot on the stack, but it means much more than that. A reference points to an object somewhere on the heap. You can make a copy of the reference without duplicating the object itself. Unlike a numeric type, an object has properties that are independent of the reference to the object.

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