What is Java Virtual Machine
You may have seen or heard about the Java virtual machine, or maybe you have seen the acronym JVM and wondered what it meant. Some may also be curious as to exactly what it does, and what you can gain from having it on your computer.
What is it?
The Java virtual machine is just what it says it is. It’s a virtual machine that runs on your computer. It is how Java programs can be ran on different operating systems. If a program was written in the Visual Basic programming language, for example, it could only be installed on a Windows computer. It would not install on a Mac or a Linux computer.
Being able to be installed on any operating system makes Java really flexible. It can even be installed on small devices such as phones, microwaves and inside your car. All of this is made possible by the Java virtual machine.
Do I need it? Where can I get it?
The Java virtual machine has to be installed on your computer for Java programs to run. Most operating systems already come with it preinstalled. But if you don’t have it, or just want to update it, then you can go to www.java.com and download it from there. The Java virtual machine is different for each operating system. Make sure to download the correct one for your operating system.
What does it do?
When a Java program is compiled (checked for errors by the programmer) it is actually made into byte code no matter what operating system it’s being made for. The Java virtual machine on your operating system takes that Java byte code and translates it so the operating system can understand it. Then the operating system tells the computer what needs to be done. So you can think of the Java virtual machine as a translator between the Java byte code and the operating system.
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