Audio Java #02 - What is JDK, JRE, JVM, JIT, how Java code is compiled and executed
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This episode covers the concepts of JDK, JRE, JVM, and JIT compilation, which are essential for every beginning Java developer. It also covers JDK versions and briefly explains how compilation and execution of Java code works.
Timestamps:
00:16 What is JDK
00:38 Differences between Java SE and Java EE
01:21 JDK and Long Term Support versions, which Java version to install in 2021
04:15 Long Term Support
04:48 What's included in the JDK
05:18 JRE Java Runtime Environment
06:06 JVM Java Virtual Machine
07:01 Utilities, Java library
09:10 Keytool
10:04 How Java code compilation and execution works, what are *.java and *.class files, bytecode, the javac command
12:55 Code execution, the java command
13:43 JIT compilation
JDK (Java Development Kit) is a set of programs, files, and pre-built classes required for Java development. The JDK includes the JRE (Java Runtime Environment) and the JVM (Java Virtual Machine).
The JRE (Java Runtime Environment) is the programs and files required to run Java programs on a computer. Prior to JDK11, the JRE was available as a separately installable package. In modern versions of Java, running Java programs requires downloading and installing the full JDK.
The JVM (Java Virtual Machine) is a program designed to execute bytecode—the code obtained after compiling *.java files containing Java code written by a programmer. JVMs are developed separately for each operating system or device.
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