Java Virtual Machine: JVM is an abstract machine.
It actually runs by Java code. Most people know Java with this slogan
"Write once and run everywhere' This slogan is because of JVM.
• Java Runtime Environment : JRE is what we need to run a Java program
and containsset of libraries and other files that JVM uses at run time.
JRE = JVM + Library Classes
• Java Development Kit : JDK is what we need to compile Java source code
and contains JRE, development tools. JDK = JRE + Development tools