Introduction to Java

Java is an Object Oriented, Cross platform programming language
      Java is used in various platforms like mobile devices, Smart watches and         many other electronic items
The main advantage of java is that data cannot be accessed using external functions and new data and functions can be easily added.

Getting Started

Java is a general-purpose object oriented computer-programming language that is class based and concurrent, specifically designed to have as few implementation dependencies as possible.

This lets programmers and application developers write once, run anywhere meaning that compiled Java code can run on all platforms that support Java without the need for recompilation.

Java applications are compiled to byte code’s that can run on any Java virtual machine (JVM) regardless of its computer architecture.

Java was originally developed by James Gosling and Patrick Naughton at Sun Microsystems (which was later acquired by Oracle Corporation). Java derives much of its syntax from C and C++ and also has many other important features.

History of Java

The development of Java originally was started by a team of 30 people led by James gosling and Patrick Naughton. They named this project as Green which was later changed to Java in course of time.

The main aim behind the implementation of Java is to build a programming laungage which can be used in electronic items, and also which has less execution time, less memory and power consumption.

They wanted the language to be Simple and robust, Architecture neutral.

Simple includes less execution time ( Ex: let’s consider we are switching through channels in our television if that takes more amount to time to switch from one channel to another then we might not like watching the TV, so here in this scenario the execution time has to be less).

Architecture neutral includes the program written once has to get executed in every Java supported device. We can refer it to as WORA ( Write Once Run Anywhere).

Major release versions of Java, along with their release dates:

◆ JDK 1.0 (January 23, 1996)

◆ JDK 1.1 (February 19, 1997)

◆ J2SE 1.2 (December 8, 1998)

◆ J2SE 1.3 (May 8, 2000)

◆ J2SE 1.4 (February 6, 2002)

◆ J2SE 5.0 (September 30, 2004)

◆ Java SE 6 (December 11, 2006)

◆ Java SE 7 (July 28, 2011)

◆ Java SE 8 (March 18, 2014)

◆ Java SE 9 (September 21, 2017)

◆ Java SE 10 (March 20, 2018)

◆ Java SE 11 (September 25, 2018)

Comparision of Java with other Programming Languages(C and C++)

C and C++ are static where Java is dynamic

C and C++ are static PL : Static PL refers to the PL which allocates memory for primitive data types at compilation time. Most of you might get confused here referring that there are calloc() and malloc() functions for memory allocations. Those are for explicit memory allocation (developer use), in context to default memory allocation the memory is allocated at compilation time.

Java is a dynamic PL : Dynamic PL refers to PL which allocates memory for primitive data types at run time.

Difference between #include header files and import statements



Include statements are used define the header files in C Import is used to define packages in Java

#include statements are recognised by pre-processor and the specific header files are replaced by the code written in them Import statements are recognised by compiler and JVM

#include supports static memory loading Import supports dynamic memory loading

We can include only one header file using one include statement
Ex:#include #include
We can include multiple packages using one import statement
image-file-name


EX: import java.io.*;
Import java.util.*;

Advantages of Java

Advantages of Java:

Simple: Java is designed to be easy, simple and robust programming language which uses less memory and gives high performance.

Object-Oriented: Uses objects for memory allocation at run time.

Platform-Independent: We can move the Java programs from one system to another with ease.

Secure: The Java language, compiler, interpreter, and runtime environment were each developed with security in mind.

Allocation: This uses stack memory allocation where we can store and retrieve data in a much easier manner.

Multithreaded: we can perform simultaneous tasks with in a program with ease.

  • Simple: Java is designed to be easy, simple and robust programming language which uses less memory and gives high performance.
  • Object-Oriented: Uses objects for memory allocation at run time.
  • Platform-Independent: We can move the Java programs from one system to another with ease.
  • Secure: The Java language, compiler, interpreter, and runtime environment were each developed with security in mind.
  • Allocation: This uses stack memory allocation where we can store and retrieve data in a much easier manner.
  • Multithreaded: we can perform simultaneous tasks with in a program with ease.

About Author

This is Krishna.I am the author of this blog. I am a technology enthusiast. If you found this article helpful please share it with your friends. Please provide your valuable comments on this blog.

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