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[50] [51] However, Java programs' execution speed improved significantly with the introduction of just-in-time compilation in 1997/1998 for Java 1.1, [52] the addition of language features supporting better code analysis (such as inner classes, the StringBuilder class, optional assertions, etc.), and optimizations in the Java virtual machine ...
Parts of the Java Class Library must load before program execution (at least the classes used within a program). [64] This leads to a significant memory overhead for small applications. [citation needed] Both the Java binary and native recompilations will typically be in memory. The virtual machine uses substantial memory.
This is a list of the instructions that make up the Java bytecode, an abstract machine language that is ultimately executed by the Java virtual machine. [1] The Java bytecode is generated from languages running on the Java Platform, most notably the Java programming language.
Java bytecode is the instruction set of the Java virtual machine (JVM), the language to which Java and other JVM-compatible source code is compiled. [1] Each instruction is represented by a single byte , hence the name bytecode , making it a compact form of data .
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A JVM language is any language with functionality that can be expressed in terms of a valid class file which can be hosted by the Java Virtual Machine. A class file contains Java Virtual Machine instructions (Java byte code) and a symbol table, as well as other ancillary information. The class file format is the hardware- and operating system ...
Java code coverage tools are of two types: first, tools that add statements to the Java source code and require its recompilation. Second, tools that instrument the bytecode, either before or during execution. The goal is to find out which parts of the code are tested by registering the lines of code executed when running a test.
peer classes - to execute code at the host JVM level (instead of JPF), which is mostly used to implement native methods; bytecode factories - to provide alternative execution semantics of bytecode instructions (e.g. to implement symbolic execution) choice generators - to implement state space branches such as scheduling choices or data value sets
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