*7 Advanced Java Interview Questions* ⚙️💼 1️⃣ *What is the difference between abstract class and interface?* ➡️ Abstract class can have method bodies; interface (till Java 7) can't. Interfaces support multiple inheritance. 2️⃣ *What is multithreading in Java?* ➡️ A process of executing multiple threads simultaneously for efficient CPU use. 3️⃣ *What is the use of the `final` keyword?* ➡️ Final variables can’t change, final methods can’t be overridden, final classes can’t be extended. 4️⃣ *Explain Garbage Collection in Java.* ➡️ Automatic memory management: removes unused objects using algorithms like Mark and Sweep. 5️⃣ *What are the types of memory in JVM?* ➡️ Heap, Stack, Method Area, Program Counter Register, Native Method Stack. 6️⃣ *What is the difference between `HashMap` and `HashTable`?* ➡️ `HashMap` is non-synchronized and faster; `HashTable` is synchronized but slower. 7️⃣ *What is Java Stream API?* ➡️ A powerful feature to process collections using functional-style operations like map, filter, reduce. 💬 *Tap ❤️ for more Java tips!*