Object-Oriented-Programming helps programmers develop programs, which can store knowledge, state, data, and do work/tasks. Java programmers use a class as a standard of what an object can do. A method modifies a class state (applicable to all class instances), and an instance represents a class. Java has a simple and clean coding style that does not require complex features. The ability to integrate compiled languages and interpreted languages with Java compiler (javac) and Java Virtual Machine (JVM) makes Java popular choice. Java uses a platform-independent to execute a compiled program on any machine by converting source code into intermediate code that can run on any hardware JVM compliant. Java’s write-once-run-anywhere means that it can run on any operating system.
The concept behind Java is its four pillars of Object-Oriented Programming: encapsulation, data abstraction, polymorphism, and inheritance. Encapsulation describes data hiding by restricting access to instance variables and making accessor methods public. Data abstraction describes a concept or idea that is not associated with any particular instance, allowing abstract class/Interface to express intent without actual implementation. Polymorphism pertains to one name having many forms, both static and dynamic. Static polymorphism uses method overloading, and dynamic polymorphism uses method overriding. Inheritance expresses an is-a or has-a relationship between two objects by reusing existing code based on class inheritance or interface implementation.
Java’s features are inherited from
C and C++ but improved. With Java’s ability to handle run-time
errors, security supported access modifiers, distribution applications,
interactive multi-threading, high performance, and dynamic linking, making Java’s
smooth programming architecture famous for users and developers. Downloading
and installing Java is easy with step-by-step instructions provided by
Oracle’s The Java Tutorials.
