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It is a general-purpose programming language intended to let programmers write once, run anywhere , meaning that compiled Java code can run on all platforms that support Java without the need to recompile.
The JIT compiler translates the Java bytecode into native processor instructions at run-time and caches the native code in memory during execution. The use of bytecode as an intermediate language permits Java programs to run on any platform that has a virtual machine available.
Java bytecode is used at runtime either interpreted by a JVM or compiled to machine code via just-in-time (JIT) compilation and run as a native application. As Java bytecode is designed for a cross-platform compatibility and security, a Java bytecode application tends to run consistently across various hardware and software configurations.
Write once, run anywhere ( WORA ), or sometimes Write once, run everywhere ( WORE ), was a 1995 [1] slogan created by Sun Microsystems to illustrate the cross-platform benefits of the Java language. [2] [3] Ideally, this meant that a Java program could be developed on any device, compiled into standard bytecode, and be expected to run on any ...
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. The Java bytecode is generated from languages running on the Java Platform, most notably the Java programming language.
A Java virtual machine (JVM) is a virtual machine that enables a computer to run Java programs as well as programs written in other languages that are also compiled to Java bytecode. The JVM is detailed by a specification that formally describes what is required in a JVM implementation.
Jasper is Tomcat's JSP Engine. Jasper parses JSP files to compile them into Java code as servlets (that can be handled by Catalina). At runtime, Jasper detects changes to JSP files and recompiles them. As of version 5, Tomcat uses Jasper 2, which is an implementation of the Sun Microsystems' JSP 2.0 specification.
Dalvik, named after a town in Iceland by its creator Dan Bornstein, was designed for embedded devices with very low RAM and CPU to run Java code, and eventually support C++ for "heavy-duty apps" and JavaScript for "light-weight widget-like apps" as first-class languages with Java catering to the rest.
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.
The following table lists notable online software source code playgrounds. A playground allows learning about, experimenting with and sharing source code.