Learning computer programming java

Java Tutorial

Java is popular high-level, class-based object oriented programming language originally developed by Sun Microsystems and released in 1995. Currently Java is owned by Oracle and more than 3 billion devices run Java. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX. Java is used to develop numerious types of software applications like Mobile apps, Web apps, Desktop apps, Games and much more.

Java is a general-purpose programming language intended to let programmers write once, run anywhere (WORA). This means that compiled Java code can run on all platforms that support Java without the need to recompile.

This Java Tutorial has been prepared by well experienced Java Programmers for the Software Engineers to help them understand the basic to advanced concepts of Java Programming Language. After completing this tutorial, you will find yourself at a moderate level of expertise in Java, from where you can take yourself to the next levels.

Java Jobs

Java is very high in demand and all the major companies are recruiting Java Programmers to develop their Desktop, Web and Mobile applications.

Today a Java Programmer with 3-5 years of experience is asking for around $120,000 annual package and this is the most demanding programming language in America. Though it can vary depending on the location of the Job. Following are the great companies who are using Java and they need good Java Programmers:

• Google
• Microsoft
• Facebook
• IBM
• Amazon
• Netflix
• Pinterest
• Uber
• JetBrains
• Many more.

So, you could be the next potential employee for any of these major companies. We have developed a great learning material for Java which will help you prepare for the technical interviews and certification exams based on Java. So, start learning Java using this simple and effective tutorial from anywhere and anytime absolutely at your pace.

Why to Learn Java?

Java is a MUST for students and working professionals to become a great Software Engineer specially when they are working in Software Development Domain. If you will conduct a servey about the best programming language, Java is sure to come up.

Java is fairly easy to learn, so if you are starting to learn any programming language then Java could be your great choice. There’s also plenty of Java tools that make it easy for developers and beginners to use. There are many other good reasons which makes Java as the first choice of any programmer:

• Java is Open Source which means its available free of cost.
• Java is simple and so easy to learn
• Java is much in demand and ensures high salary
• Java has a large vibrant community
• Java has powerful development tools
• Java is platform independent

Java Online Compiler

This tutorial provides enough number of examples to explain to concepts. To compile and execute your examaples in your browser itself, we have provided Java Online Compiler. You can Edit and Execute almost all the examples directly from your browser. Try to click the icon to run the following Java code to print conventional «Hello, World!».

Below code box allows you to change the value of the code. Try to change the value inside println() and run it again to verify the result.

public class MyFirstJavaProgram < /* This is my first java program. * This will print 'Hello World' as the output */ public static void main(String []args) < System.out.println("Hello World"); // prints Hello World >>

Java Applications

The latest release of the Java Standard Edition is Java SE 18. With the advancement of Java and its widespread popularity, multiple configurations were built to suit various types of platforms. For example: J2EE for Enterprise Applications, J2ME for Mobile Applications.

The new J2 versions were renamed as Java SE, Java EE, and Java ME respectively. Java is guaranteed to be Write Once, Run Anywhere.

• Multithreaded − With Java’s multithreaded feature it is possible to write programs that can perform many tasks simultaneously. This design feature allows the developers to construct interactive applications that can run smoothly.
• Interpreted − Java byte code is translated on the fly to native machine instructions and is not stored anywhere. The development process is more rapid and analytical since the linking is an incremental and light-weight process.
• High Performance − With the use of Just-In-Time compilers, Java enables high performance.
• Distributed − Java is designed for the distributed environment of the internet.
• Dynamic − Java is considered to be more dynamic than C or C++ since it is designed to adapt to an evolving environment. Java programs can carry extensive amount of run-time information that can be used to verify and resolve accesses to objects on run-time.

Target Audience

This tutorial has been prepared for the beginners to help them understand the basics to advanced concepts of Java programming language. After completing this tutorial, you will find yourself at a moderate level of expertise in Java, from where you can take yourself to the next levels.

Prerequisites

Although it is a beginners tutorial, we assume that the readers have a reasonable exposure to any programming environment and knowledge of basic concepts such as variables, commands, syntax, etc.

Java Questions & Answers

You can explore a set of Java Questions and Answers at Java Questions & Answers

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Learn Java – Free Java Courses for Beginners

Java is a really popular programming language that has been around for over 25+ years. If you are interested in learning Java, then there are plenty of free online courses to choose from.

• Java Tutorial for Beginners — Programming with Mosh
• Java Course — SoloLearn
• Java Programming: Solving Problems with Software — Coursera
• Java Programming: Arrays, Lists, and Structured Data — Coursera
• Java Programming: Principles of Software Design — Coursera
• Java Programming Basics — Udacity
• Java Programming — Test Automation University
• Intro to Java Programming Course for Absolute Beginners — freeCodeCamp
• Learn Functional Programming in Java — freeCodeCamp
• Java Virtual Machine Architecture Explained for Beginners — freeCodeCamp

Java Tutorial for Beginners

In this Programming with Mosh YouTube course, you will learn about strings, arrays, conditionals, loops and more. You will also build a mortgage calculator.

Java Course

In this SoloLearn course, you will learn about arrays, objects, classes, loops, and more.

Java Programming: Solving Problems with Software

In this Coursera course, you will learn about the classes, conditionals, loops, functions and more. You will also learn how to work with CSV files in Java and build a mini project.

Java Programming: Arrays, Lists, and Structured Data

In this Coursera course, you will learn about arrays, cryptography, HashMaps, and more. You will also build a mini project about the Vigenère cipher.

Java Programming: Principles of Software Design

In this Coursera course, you will learn about different sorting algorithms, and the basics of predictive text.

Java Programming Basics

In this Udacity course, you will learn about arrays, objects, classes, loops, debugging, and more.

Once you finish the beginner course, then you can take this intermediate Object Oriented Programming course.

Java Programming

In this Test Automation University course, you will learn about classes, loops, switch statements, conditionals, arrays, strings, abstraction and more.

Intro to Java Programming Course for Absolute Beginners

In this freeCodeCamp YouTube course, you will learn about arrays, objects, classes, loops, debugging, and more.

Learn Functional Programming in Java

In this freeCodeCamp YouTube course, you will learn about the properties of functional programming, callbacks, functional interfaces, combinator pattern, lambdas, and more.

Java Virtual Machine Architecture Explained for Beginners

In this freeCodeCamp article, you will learn about the Java Virtual Machine as well as the architecture behind it.

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Java | How to start learning Java

Java is one of the most popular and widely used programming languages and platforms. A platform is an environment that helps to develop and run programs written in any programming language.
Java is fast, reliable, and secure. From desktop to web applications, scientific supercomputers to gaming consoles, cell phones to the Internet, Java is used in every nook and corner.

About Java

• Java is a simple language: Java is easy to learn and its syntax is clear and concise. It is based on C++ (so it is easier for programmers who know C++). Java has removed many confusing and rarely-used features e.g. explicit pointers, operator overloading, etc. Java also takes care of memory management and it also provides an automatic garbage collector. This collects the unused objects automatically.
• Java is a platform-independent language: The programs written in Java language, after compilation, are converted into an intermediate level language called the bytecode which is a part of the Java platform irrespective of the machine on which the programs run. This makes java highly portable as its bytecodes can be run on any machine by an interpreter called the Java Virtual Machine(JVM) and thus java provides ‘reusability of code’.
• Java is an object-oriented programming language: OOP makes the complete program simpler by dividing it into a number of objects. The objects can be used as a bridge to have data flow from one function to another. We can easily modify data and function’s as per the requirements of the program.
• Java is a robust language: Java programs must be reliable because they are used in both consumer and mission-critical applications, ranging from Blu-ray players to navigation systems.
• Java is a multithreaded language: Java can perform many tasks at once by defining multiple threads. For example, a program that manages a Graphical User Interface (GUI) while waiting for input from a network connection uses another thread to perform and wait’s instead of using the default GUI thread for both tasks. This keeps the GUI responsive.
• Java programs can create applets: Applets are programs that run in web browsers. But applets support was deprecated in Java 9 release and has been removed in Java 11 release due to waning browser support for the Java plugin.
• Java does not require any preprocessor: It does not require inclusion of header files for creating a Java application.

Therefore, Java is a very successful language and it is gaining popularity day by day.

Learn Java the Right Way

Get started with a highly sought-after, widely used, and in-demand programming language with Educative’s interactive course Learn to Code: Java for Absolute Beginners, even if you don’t have programming experience. Sign up at Educative.io with the code GEEKS10 to save 10% on your subscription.

Important tips and links to get you started

1. Understand the basics:
   Learning the basics of any programming language is very important. It is the best way to begin learning something new. Don’t have any anxiety, begin learning the concepts about the language. Get familiar with the environment, and slowly you will get used to it within no time. Here are a few links to get you started:
   • Java – Overview
   • Java – Basics(Articles)
   • Java – Basics (Videos)
   • OOP – Concept
2. Patience is the key:
   Learning Java will be overwhelming because of the volume of material about the language but be patient, learn at your own pace, don’t rush. Mastering Java is a process that takes time. And remember even the best coders would have started at some point. So it’s not a big deal, just do as much as you can and keep going. Give it your time. Patience is the key to success.
3. Practice Coding
   Once you have understood the basics, the best thing to do is to brush up your skills with regular practice. True knowledge comes only when you implement what you’ve learned, as is said ‘Practice Makes a Man Perfect’. So, code more than you read. This will build your confidence. Remember Perfect Practice makes you Perfect.
   Practice Coding: You can increase your coding skills here. Happy Coding!
4. Read about Java regularly
   Continuously read about the various topics in Java and try to explore more. This will help to maintain your interest in Java.
   Go through this link to explore the vast world of Java:
   Explore Java >>
   Recent articles on Java >>
5. Study in a group
   Group study is a better way to learn something. This way you get to know about new things about the topic as everyone presents their ideas and you can discuss and solve your coding problems on the spot. Get to know a common group of people who are willing to learn java.
   Get help from a tutor and read as many books about java as possible. There are many good books in the market that will help you in learning java.

Setting up Java

You can download java from here. Here you will find different versions of java. Choose and download the one compatible with your operating system.
For detailed instructions for setting up of Java, refer this article.

After you have set up the Java environment correctly, try running this simple program:

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