Java and Its Introduction

 Java and Its Introduction

Java :

• Java is a general - purpose, high level programming language developed by Sun Microsystems.
• Java was designed to be small , simple and portable across all platforms and operating systems.
• It is a popular platform to develop enterprise applications.

Features of Java:

• It is Object Oriented Programming language.
• Simpler language.
• Robust (Easy Memory Management)
• Architecture Portable  (Can run on any Platform.
• Secure 
• Support of Multithreading at language level.
• Designed to handle Distributed applications.

Platform Independence:

• Java is a platform independent language.
• "write once run everywhere"
• Platform is possible due to Java Virtual Machine or JVM.

Java Architecture:

Source File (HelloWorld.java)

                     ⬇

         Compiler (javac)

                     ⬇

Bytecode (HelloWorld.class)

now it enter the JVM 

 JVM : 

Class Loader 

        ⬇

Byte Code Verifier

         ⬇

Interpreter     ➡         JIT Code generator

        ⬇

Runtime

Automatic garbage Collection :

• Unique feature in java
• Reuse the already allocated memory locations which is presently not in active use
• avoids memory leakage.