Interview question

What is Java and what are its main features? Java क्या है और इसकी मुख्य विशेषताएं क्या हैं?

Answer

Java is a high-level, object-oriented, platform-independent programming language developed by Sun Microsystems (now Oracle). It follows the principle 'Write Once, Run Anywhere' (WORA).

Feature	Description
Platform-Independent	Runs on any platform with JVM installed
Object-Oriented	Everything is an object, supports OOP principles
Secure	Built-in security features and bytecode verification
Robust	Strong type checking, exception handling, memory management
Multi-threaded	Built-in support for concurrent programming
Portable	Compiled code can run on any platform
High Performance	JIT compilation, garbage collection optimization
Distributed	Support for network programming and RMI

// Java Program Structure
public class HelloWorld {
    public static void main(String[] args) {
        System.out.println('Hello, Java!');
    }
}

// Key Points:
// 1. Java is compiled to bytecode (.class files)
// 2. Bytecode runs on JVM (Java Virtual Machine)
// 3. One compile, run anywhere principle
// 4. Garbage collection automatically manages memory
// 5. Strong type system ensures type safety
// 6. Exception handling for error management
// 7. Multi-threading support for concurrent execution
// 8. Rich standard library (Java API)

Java एक high-level, object-oriented programming language है। यह 'Write Once, Run Anywhere' के सिद्धांत पर काम करता है।

Feature	Description
Platform-Independent	किसी भी platform पर चल सकता है
Object-Oriented	OOP principles को support करता है
Secure	Built-in security features
Multi-threaded	Concurrent programming support

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