What is Java? Java is a cross-platform object-oriented programming language that was released by Sun Microsystems in the year 1995. Today, Java is needed to run various applications such as games, social media applications, audio and video applications, etc.
In this blog, I would be covering following topics:
What is Java used for?
Before I go ahead with this, let me brief you about why you should choose Java. It is highly popular and has dominated this field from early 2000’s till the present 2018.
Some of the applications are listed below:
- Banking: To deal with transaction management.
- Retail: Billing applications that you see in a store/restaurant are completely written in Java.
- Information Technology: Java is designed to solve implementation dependencies.
- Android: Applications are either written in Java or use Java API.
- Financial services: It is used in server-side applications.
- Stock market: To write algorithms as to which company they should invest in.
- Big Data: Hadoop MapReduce framework is written using Java.
- Scientific and Research Community: To deal with huge amount of data.
Wait! Java can do more.
Let’s see how some of the technologies make use of Java as an essential core of their functionalities.
You can see in the above image, Java is an ocean of opportunities.
Java is a programming language developed by James Gosling with other team members named Mike Sheridan and Patrick Naughton also called as Green Team in 1995 for Sun Microsystems for digital devices such as set-top boxes, televisions etc. Now, let us explore the language in detail.
What is Java?
It is an object-oriented language similar to C++, but with advanced and simplified features.This language is free to access and can run on all platforms.
Java is: –
- Concurrent where you can execute many statements instead of sequentially executing it.
- Class-based and an object-oriented programming language.
- Independent programming language that follows the logic of “Write once, Run anywhere” i.e. the compiled code can run on all platforms which supports java.
In simple words, it is a computing platform where you can develop applications.
If you are interested in mastering Java, preparing with some challenging Java interview questions can give you an edge in landing your dream job.
You may go through this session where our expert has explained the topics in a detailed manner with examples which will help you to understand the concepts better.
Portable: This is platform independent which means that any application written on one platform can be easily ported to another platform.
JVM (Java Virtual Machine)
It is an abstract machine. It is a specification that provides a run-time environment in which the bytecode can be executed. It follows three notations:
- Specification: It is a document that describes the implementation of the JVM. It is provided by Sun and other companies.
- Implementation: It is a program that meets the requirements of JVM specification.
- Runtime Instance: An instance of JVM is created whenever you write a command on the command prompt and run the class.
JRE (Java Runtime Environment)
JRE refers to a runtime environment in which bytecode can be executed. It implements the JVM and provides all the class libraries and other support files that JVM uses at runtime. So JRE is a software package that contains what is required to run a program. Basically, it’s an implementation of the JVM which physically exists.
JDK(Java Development Kit)
It is the tool necessary to:-
- Package Java programs.
The JDK completely includes JRE which contains tools for programmers. The Development Kit is provided free of charge. Along with JRE, it includes an interpreter/loader, a compiler (javac), an archiver (jar), a documentation generator and other tools needed in Java development. In short, it contains JRE + development tools.
Got a question for us? Please mention it in the comments section of this blog and we will get back to you as soon as possible.