1. Abstraction vs Inheritance 2. What is Garbage collector? 3. What is class loader? 4. Spring security 5. Scopes of bean 6. Wait , notify and notify all 7. Class level vs object level local 8. Arraylist vs Linkedlist 9. Singleton class 10.RestController vs Controller

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Java interview questions covering topics like abstraction, inheritance, garbage collector, class loader, Spring security, bean scopes, wait-notify, class vs object level local, ArrayList vs LinkedList, Singleton class, and RestController vs Controller.

Abstraction focuses on hiding implementation details while inheritance allows a class to inherit properties and methods from another class.
Garbage collector is a program that automatically frees up memory by deleting objects that are no longer in use.
Class loader is responsible for loading classes into the JVM at runtime.
Spring security is a framework that provides authentication and authorization for Java applications.
Bean scopes determine the lifecycle of a bean in a Spring application.
Wait, notify, and notifyAll are methods used for inter-thread communication in Java.
Class level local variables are shared among all instances of a class while object level local variables are unique to each instance.
ArrayList is backed by an array while LinkedList is backed by a doubly linked list.
Singleton class is a class that can only be instantiated once.
RestController is used for building RESTful web services while Controller is used for building traditional web applications.

1. Abstraction vs Inheritance 2. What is Garbage collector? 3. What is class loader? 4. Spring security 5. Scopes of bean 6. Wait , notify and notify all 7. Class level vs object level local 8. Arraylist vs Linkedlist 9. Singleton class 10.RestController vs Controller

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