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On 13 November 2006, Sun's HotSpot Java virtual machine (JVM) and Java Development Kit (JDK) were made available [4] under the GPL license. [5]Since version 0.95, GNU Classpath, a free implementation of the Java Class Library, supports compiling and running javac using the Classpath runtime — GNU Interpreter for Java (GIJ) — and compiler — GNU Compiler for Java (GCJ) — and also allows ...
java is the Java runtime launcher, a type of SDK Tool (A command-line tool, such as javac, javadoc, or apt)-classpath D:\myprogram sets the path to the packages used in the program (on Linux, -cp /home/user/myprogram) and; org.mypackage.HelloWorld is the name of the main class
In the case of GCJ, it uses ecj to perform this initial stage, then converts the bytecode to native code. From 0.95 onwards, GNU Classpath also supports compiling and running the newly GPLed open-source javac compiler using GNU Classpath and also allows the GNU Classpath class library, tools and examples to be compiled with javac itself.
For example, to build the compile target Ant must first create a directory called classes (which Ant will do only if it does not already exist) and then invoke the Java compiler. Therefore, the tasks used are mkdir and javac. These perform a similar task to the command-line utilities of the same name. Another task used in this example is named jar:
Javadoc is a documentation generator created by Sun Microsystems for the Java language (now owned by Oracle Corporation) for generating API documentation in HTML format from Java source code.
Java is a high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible. It is a general-purpose programming language intended to let programmers write once, run anywhere (), [16] meaning that compiled Java code can run on all platforms that support Java without the need to recompile. [17]
This makes it possible (for example): to load or unload classes at runtime (for example to load libraries dynamically at runtime, even from an HTTP resource). This is an important feature for: implementing scripting languages, such as Jython; using bean builders; allowing user-defined extensibility; allowing multiple namespaces to communicate.
For example, iadd will add two integers, while dadd will add two doubles. The const, load, and store instructions may also take a suffix of the form _n, where n is a number from 0–3 for load and store. The maximum n for const differs by type. The const instructions push a value of the specified type onto the stack.