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The Java virtual machine specification does not specify how a class loader should locate classes. Virtual machine architecture. The JVM operates on specific types of data as specified in Java Virtual Machine specifications. The data types can be divided into primitive types (integers, Floating-point, long etc.) and Reference types.
This is achieved by compiling the Java language code to an intermediate representation called Java bytecode, instead of directly to architecture-specific machine code. Java bytecode instructions are analogous to machine code, but they are intended to be executed by a virtual machine (VM) written specifically for the host hardware.
The Java virtual machine heap is the area of memory used by the JVM for dynamic memory allocation. In HotSpot the heap is divided into generations: The young generation stores short-lived objects that are created and immediately garbage collected. Objects that persist longer are moved to the old generation (also called the tenured generation ...
The Java Development Kit ( JDK) is a distribution of Java technology by Oracle Corporation. It implements the Java Language Specification ( JLS) and the Java Virtual Machine Specification ( JVMS) and provides the Standard Edition ( SE) of the Java Application Programming Interface ( API ). It is derivative of the community driven OpenJDK which ...
A Java processor is the implementation of the Java virtual machine (JVM) in hardware. In other words, the Java bytecode that makes up the instruction set of the abstract machine becomes the instruction set of a concrete machine. These were the most popular form of a high-level language computer architecture, and were "an attractive choice for ...
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.
HotSpot, released as Java HotSpot Performance Engine, [1] is a Java virtual machine for desktop and server computers, developed by Sun Microsystems which was purchased by and became a division of Oracle Corporation in 2010. Its features improved performance via methods such as just-in-time compilation and adaptive optimization.
Unlike Java Virtual Machines, which are stack machines, the Dalvik VM uses a register-based architecture that requires fewer, typically more complex, virtual machine instructions. Dalvik programs are written in Java using the Android application programming interface (API), compiled to Java bytecode, and converted to Dalvik instructions as ...