Although Java is a relatively new programming language, it is not exactly new. The year 2022 marks the 25th anniversary of this versatile programming language! Over the years, Java has maintained its position among the top three most popular programming languages in the world, and rightly so.
Today, Java boasts of an active community and is extensively used as the server-side language for numerous back-end development projects, including Big Data and Machine Learning projects and obviously, Web and Android development.
Why is Java popular?
The aspect which makes Java one of the most appealing languages is that it, at its core, Java is an object-oriented programming (OOP) language. OOP offers a neat modular structure, thereby making it easier to solve complex problems. Its modular nature helps programmers to write reusable code and also enhances the development process.
In Java programming, classes that define the data attributes and behaviors (defined by methods coded in the class) are used to create objects. Furthermore, Java includes features like abstraction, encapsulation, polymorphism, and inheritance, along with best practices and built-in packages, simplifying the writing of Java code. Since Java Java objects don’t need any external references, Java code is exceptionally robust.
Now, let’s look at some of the best features of Java that make it so popular!
1. Java is user-friendly
Java has an English-like syntax, which makes it the perfect language for beginners who can learn Java in two phases – begin with Core Java and then progress to Advanced Java. So, Java has a simple learning curve. And if you possess the foundational knowledge of C and C++, it won’t take long for you to master Java.
2. Java for everything!
For long, Java has been the staple programming language for developing Web apps, Android apps, and software tools like Eclipse, IntelliJ IDEA, NetBeans IDE, etc. Today, Java’s use cases have expanded to Data Science applications, Machine Learning applications, and even IoT. Developers and programmers prefer Java for designing all such applications because Java has a suite of high-level concurrency tools and packages that make it possible to create highly scalable solutions. Also, Java is multi-platform compatible.
3. Java boasts of rich API
Although Java contains around fifty keywords, its Application Programming Interface (API) is both extensive and rich – it is replete with numerous methods that you can directly use in any code. Java API comprises methods that can cater to every purpose, including networking, connecting to databases, parsing XML, handling input-output, and so on. Furthermore, Java has plenty of open-source libraries such as Google Guava, Apache Xerxes, Apache POI, Apache Commons, OpenCV, Gson, ETC.
Must Read: Java Interview Question & Answers.
4. A robust community backs Java
One of the biggest reasons for Java’s popularity is its strong and active community support. It boasts of being the second-largest among the Stack Overflow community. So, rest assured, you can rely on the Java community to help you out if you ever get stuck in a programming rut.
5. Java has excellent documentation
Java is an open-source programming language, which means it is absolutely free. Another excellent quality of the language is that Java is well-documented. It has a detailed guide that will clarify the problems that you may face while coding in Java.
6. Java has a suite of powerful development tools
One of Java’s most interesting aspects is its Integrated Development Environment (IDE). Java’s IDE is an extensive suite of various automation tools, editors, and debuggers. NetBeans, Eclipse, and IntelliJ IDEA are the three most popular Java IDEs. As for tools, Java has Maven and ANT for developing Java applications, Jenkins for Continuous Integration and delivery, and JConsole and Visual VM for monitoring Heap usage.
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These are some of the most crucial reasons why Java is popular among developers, data science professionals, and industry giants. The Java Runtime Environment (JRE) is compatible with almost all devices and platforms, from Macintosh, Linux/Unix, Windows, to other mainframe systems and even mobile devices. No wonder why Java is an omnipresent force in the industry right now!
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Explain the features of the Java language?
Java is a simple language and can be learned quickly, making writing programs more accessible and faster. It follows the object-oriented programming (OOP) approach, which helps to maintain our code as the objects incorporate data and its behavior. The Java program is compiled to byte code that can run on any system, making it portable. Java is a platform-independent language, unlike C++ and C. It is not dependent on any operating system. Java doesn’t use pointers which makes it more secure as now the programmer cannot directly access the address spaces in memory. Java supports multithreading and is both an interpreted and compiled language.
How is JDK different from JRE and JVM?
Java Development Kit is a software dev environment used to create Java applications and applets. It exists physically and comprises JRE and development tools. JDK is an implementation of Java platforms that Oracle develops. JRE stands for Java Runtime environment, which implements Java Virtual Machine (JVM). It consists of software tools and other files used by JVM at runtime. JVM is an abstract machine used to provide a runtime environment where the byte code is executed. It is platform-dependent, and it is an instance created at runtime when a Java class is run. Specification, Instance, and Implementation are the three notions of JVM.
Explain the types of memory areas are there in the system?
There are many ways to allocate memory to the machine. When we declare an object of any class, the memory gets allocated. Class area stores per-class structures such as fields, runtime pool, methods, etc. Heap is the area where the memory is assigned to the objects of a class. Stack area store frames hold the partial results and local variables of a given scope in a program. Stack has a role in method invocation and the method's return value. Program Counter Register stores the address value of the JVM currently in execution. Native methods of an application also have their separate memory area.