IBM Developer Kits for AIX, Java Technology Edition (SDK, JDK) provide the performance, scalability, and stability you need for deploying enterprise e-business Java solutions. This series of articles will help you quickly start running your Java applica
Tutorial Details:
IBM\'s resource for developers, developerWorks, is the place to start. Select Java Technology, then \"IBM developer kits\" from the right side of the panel for the links to our developer kits for various platforms, including AIX, Linux, OS/2, z/OS and Windows.
The Java source code gets compiled by a Java compiler into Java bytecode. This bytecode is platform independent and gets input to a Java Virtual Machine (JVM) that interprets it. The JVM is provided by OS vendors on a given hardware platform
The interpreting JVM fetches, translates, and executes the bytecode one by one sequentially. Once translated and executed, there is no caching of what\'s done. If the application logic reuses the bytecode,
IT is one of the approaches built into some JVMs to overcome this inherent performance problem of the Java interpreter. With a JIT compiler, a two phase approach is used. The JIT first compiles the program\'s bytecode, or a subset of it, into optimized machine language instructions and then executes those newly generated instructions. During the compilation phase, the JIT applies many of the same optimization techniques used by standard compilers, including inlining and the elimination of redundant code. The generated code is also cached for subsequent reuse throughout the lifetime of this JVM instance.
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