What is JVM?

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Java Virtual Machine (JVM) is a type of a virtual machine or abstract computing machine which converts JAVA byte codes into a computer command. This computer command is the language used for computers to execute their functions. Technically, JVM is a platform-independent programming system that allows operating systems in computers to function. Without JVM, a computer may not be able to process machine codes and carry out its process.

IT practitioners would refer JVM as a “machine within a machine” because it mimics the real Java processor. For instance it establishes socket for two different operating systems so they can connect together. JVM translates the programming code and the computer will then be able to run programs. Before the codes are executed within the computer hardware, they undergo three checking processes. First, they are branch into valid locations. When data are initialized, the JVM makes sure that they are type-safe. Lastly, JVM controls the private data so they cannot be encrypted or hacked. The JVM verification process helps keep data intact while building a strong memory protection even without the necessity of memory management unit.

Another task of the JVM is specifying instructions one at a time. When the bytecodes are already compiled in one place, the JVM maps it into a real processor so the programming flow is not distorted. The JVM language is enclosed a virtual class file. It looks like a table of symbols, each representing different interfaces. The latest JVM development includes a new feature that supports dynamically typed language as part of the Da Vinci Machine Project. With this, the JVM is able to support many other languages in addition to Java. IT programmers now use a variety of JVM language. The most popular JVM scripting languages are the Groovy, JRuby, Scala, Fantom, and Jython.