Simply speaking, it refers to the subset of Java SE technologies which consists of both general purpose API’s and special purpose API’s. It’s the purest form of Java primarily used for development of general desktop applications. Core Java refers to a collection of libraries rather than just the programming language. It’s the most basic version of Java which sets the foundation for all other editions of Java plus a set of related technologies such as CORBA, Java VM, etc. It’s a general term used by Sun Microsystems to describe the standard version of Java (JSE). The abundance of information and its surging popularity is why programmers and developers prefer Java over other programming languages for development of apps. It’s entirely platform independent which means it can run any compiled code on any platform. Java applications are typically compiled to bytecode and a class file containing a Java bytecode can be executed on any platform running a Java Virtual Machine (JVM) irrespective of the computer architecture. It’s influenced by the V language and much of its syntax is derived from C and C++. In technical terms, it’s a high-level programming language that is object-oriented, class based, and is specially designed to have lesser implementation dependencies compared to previous languages. The best part it runs on literally any device without the need for recompilation, hence the slogan “Write once, run anywhere”. What started out simply as an Internet language has become one of the most versatile cross-platform programming languages ever developed. Many applications and websites require you to install Java because it’s fast and secure. Even all native Android apps come built-in with Java and several companies use Java as server-side scripting language for backend development. Millions of devices throughout the world use Java as a core programming language. From mobile applications to websites, game consoles to datacenters, from mobile phones to the Internet, Java is everywhere. Java is hypothetically everywhere, thanks to its readability and simplicity. The reason it’s called the standard edition because it gave birth to all other editions of Java. This is the most basic and robust version of Java which consists of a wide variety of both general purpose and special purpose API’s. Core Java is never actually defined anywhere and is just a term used by Sun Microsystems to better describe the Java Standard Edition (Java SE). It’s a computational platform for developing application software developed by Sun Microsystems, which was later acquired by the technology giant Oracle Corporation. It’s specially designed to have fewer implementation dependencies compared to its previous versions. Java is a general purpose high-level programming language based on the concepts of object oriented programming (OOP) which derived much of the syntax from C and C++.
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