JVM concepts

Every aspiring JVM developer should be familiar with its most important concepts:

• JVM is a virtual machine
• Most implementations feature a just-in-time (JIT) compiler
• It offers a few built-in primitive datatypes
• Everything else is an object
• Objects are accessed via reference types
• The garbage collector (GC) process removes obsolete objects from memory
• Build tools are used a lot in the JVM world