Introduction To Java
Basics Of Java are discussed In This Blog Such as JDK, JVM, JRE etc..
In This Blog, We Will Learn About the Basics of the Java language such as JDK, JVM, JRE, Compile Time And Run Time etc. This is from 7th video lecture of DSA Playlist By Kunal Kushwaha
Java Development Kit
Java Runtime Environment
Java Virtual Machine
Just In Time Compiler
Computer Machines understand the language of Binary Language (0's and 1's). But it is difficult for human beings to understand this language and writing code in it is a very tedious job.
So Programmers have found a solution to it such that anybody can code in a human-understandable language, which is known as a Programming language.
Examples of Programming languages are Java, C++, C, JavaScript etc.
Here we are going to do the basics of Java.
Image credits: Kunal Kushwaha
Here In The above picture, we can see the mechanism behind the compilation and interpretation of a java file.
The code in human-readable format is written in and saved with .java extension. Then the entire file is compiled with .javac compiler and it is converted into bytecode with the .class extension.
This bytecode can be run on any operating system with the help of a Java virtual machine . Therefore Java is Platform Independent. We obtained machine-level code (0's and 1's).
Now, We will discuss what is Java Development Kit (JDK), Java Runtime Environment (JRE), Java Virtual Machine (JVM), and Just In Time (JIT).
Image credits: Kunal Kushwaha
Java Development Kit (JDK)
Java Development Kit can be installed through Oracle, download it using your Operating System
JDK provides an environment to deploy and execution of Java files.
Java Runtime Environment (JRE)
Java Runtime Environment provides facilities to run the java program only
JRE = JVM + docs generator (.javadoc) + interpreter + development tools + archiver
Java Virtual Machine (JVM)
Java Virtual Machine converts byte code into machine code.
This feature of Java makes it platform-independent.
JVM = JIT + User Interface Toolkit + Deployment Technologies + Integration Libraries + Base Libraries
Just in Time (JIT)
JIT = Java Interpreter + Garbage Collector
Reference Links