Rohan | Full-Stack Developer on Instagram: "1. What are JVM, JRE, and JDK, and how do they relate to each other? 2. Why is Java considered platform independent, and how does bytecode enable this? 3. Explain String immutability, the String pool, and when to use StringBuilder vs StringBuffer. 4. What is the difference between equals() and == in Java? Provide examples. 5. Describe OOP pillars in Java (encapsulation, inheritance, polymorphism, abstraction) with use cases. 6. What is the difference b