Java is a high-level, object-oriented, class-based programming language developed by Sun Microsystems and now maintained by Oracle. It follows the 'Write Once, Run Anywhere' principle by compiling source code into bytecode that runs on the JVM, making it platform independent.

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#Java#Core Java#JVM#Basics

Definition

Java is a high-level, object-oriented, class-based programming language designed to be simple, secure, robust, portable, and platform-independent. Programs are compiled into bytecode which the JVM executes, so the same compiled program runs unmodified on any OS with a compatible JVM.

Key Features

• Platform Independent (Write Once, Run Anywhere) • Object-Oriented • Secure and Robust (strong typing, no explicit pointers) • Multithreaded • Automatic Garbage Collection • High performance via the JIT compiler

Java Source Code (.java) → javac Compiler → Bytecode (.class) → JVM → Operating System → Output

Interview Answer

Java is a high-level, object-oriented, platform-independent programming language developed by Sun Microsystems and now owned by Oracle. It follows the Write Once, Run Anywhere principle by compiling to bytecode executed by the JVM, which is why it's widely used for portable, secure, enterprise-grade applications.

Hello World Program

java

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
    }
}