Lesson 1 of 28By Rahul Arun
Last updated on Nov 13, 2020303194Today, especially since a deadly pandemic has hit the world, the internet and smartphones have become an integral part of our lives. We use our phones for almost all of our daily tasks. Previously, we would shop at malls, line up at banks, and make travel arrangements at agencies. But now, we can do all this in the comfort of our homes using smartphones. All of this is possible because of a high-level programming language called Java.
The below topics will be covered in this tutorial:
Java is an object-oriented programming language used in distributed environments on the internet. It is a high-level language that is also easy to read and understand. With it, developers can “write once, run anywhere” (WORA), meaning that the compiled Java code will run on all Java-compatible platforms without the need for recompilation.
James Gosling and Sun Microsystems invented the Java programming language in 1991. He had a single motto while creating the language: “Write once; run anywhere.” They first named this language Oak because of the oak tree outside Gosling’s office. Later, the name changed to Green, then to Java Coffee, which was named after the coffee from Indonesia, and eventually shortened to Java in 1995.
Java is widely used in web consoles, GUIs, web and mobile applications, game development, embedded systems, and desktop applications. Apart from these, Java is also used to develop software for devices. It is used not only in computers and mobile devices, but even in electronic devices like televisions, air conditioners, washing machines, and so on. Online registration forms, banking apps, and shopping via the internet are all possible because of Java.
Java is based on C and C++. The first Java compiler was developed by Sun Microsystems and was written in C using some libraries from C++. Java files are converted to bit code format using a compiler that the Java interpreter then executes. Java code runs on Java Virtual Machine (JVM)—the runtime environment.
There are three editions in Java. Programmers can learn any of these editions based on the application they want to make.
The most widely used edition in Java is Java SE (Standard Edition). Java SE encompasses the basics of Java—most applications require Standard Edition.
The essential concepts in Java are its object-oriented programming (OOPs) features. OOP simplifies software and application development as well as maintenance by providing some concepts such as:
Java has several qualities and features, including:
Now that we have discussed the different features of Java, let’s see the different components of the Java programming language.
There are three main components of the Java programming language, including:
There are four main concepts of object-oriented programming (OOP), including:
Abstraction means showing the relevant details and hiding all the backend or internal details. In the example below, for a student to be admitted into the college, the relevant details asked will be the name, address, parent’s name, and high school marks. Details like favorite sports, food, or movies are not relevant.
Encapsulation is similar to a capsule. The entire code and all of the data are bound together in a single unit. All the methods and variables are stored under one class name, and the same class object can use it.
Polymorphism means one task is performed in different ways. One function is used for different tasks. In the example below, Method draw() can be used in different places to draw different shapes, like a triangle, rectangle, or circle.
When one class inherits certain properties and attributes of other classes, it is known as inheritance. There is always a superclass and a subclass. The subclass inherits attributes from the superclass. In the example below, the animal is a superclass that has attributes eat() and sleep(). Subclasses reptile, mammal, and human inherit these attributes.
Java is one of the most used programming languages, mainly because Java is naturally versatile, reliable, and compatible. So, it’s the in-demand skill to have if you want to start a career in programming. Here are some tips to get started:
Developers often ask themselves a question at some point in their career—Do I need a Java certification?
Some employers do value certifications a lot. Earning a certification will help you grow in your career and earn more.
Java professionals gain experience from working on projects across a range of industries. So, they learn about the needs of different sectors as well as how they work with developers. On the other hand, some employers value their employees more if they have a Java certification because it adds value to the company.
There are four types of certification levels mentioned within Oracle’s Java certification path:
Choose whichever is suitable for you. The main goal of the Oracle Java Certification exams is to test your knowledge and capabilities on prospective jobs in the Java industry.
Get a firm foundation in Java, the most commonly used programming language in software development with the Java Certification Training Course.
Hello World Program in Java
Output:
Swap two numbers without using a temporary variable
Output:
Almost everything we use in our day-to-day life is now connected to Java. Java programming language continues to be one of the top technologies in the industries, and the job demand is significantly high. If you want to learn Java and start your career in it, do refer to the following playlist link: Java Tutorials.
If you want to get your career moving in Java, Simplilearn’s Java Certification Training Course is for you. With it, you will get 70 hours of Blended Learning, lifetime access to self-paced learning resources, hands-on coding and real-world industry projects, and much more. What are you waiting for?
Name | Date | Place | |
---|---|---|---|
Full Stack Java Developer | Cohort starts on 10th Mar 2021, Weekend batch | Your City | View Details |
Full Stack Java Developer | Cohort starts on 22nd Mar 2021, Weekend batch | Chicago | View Details |
Rahul is a Senior Research Analyst at Simplilearn. Blockchain, Cloud Computing, and Machine Learning are some of his favorite topics of discussion. Rahul can be found listening to music, doodling, and gaming.
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