1. Difference between abstract class and interface. 2. Internal Working of HashMap 3. Difference Between ArrayList vs Linked List. 4. WAP to reverse a String 5. dependency Injections 6. IOC Container 7. Singleton Class

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This interview question covers various topics including abstract class, interface, HashMap, ArrayList, Linked List, String reversal, dependency injection, IOC container, and singleton class.

Abstract class is a class that cannot be instantiated and can have both abstract and non-abstract methods.
Interface is a blueprint of a class that can only have abstract methods and cannot be instantiated.
HashMap is a data structure that stores key-value pairs and uses hashing to provide constant-time performance for basic operations.
ArrayList is a dynamic array that allows fast random access but slower insertion and deletion.
Linked List is a data structure that consists of nodes where each node contains a reference to the next node.
String reversal can be achieved by using built-in methods or by iterating through the characters and swapping them.
Dependency injection is a design pattern where the dependencies of a class are provided externally rather than being created within the class.
IOC (Inversion of Control) container is a software component that manages the lifecycle of objects and their dependencies.
Singleton class is a class that allows only one instance to be created and provides a global point of access to it.

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1. Difference between abstract class and interface. 2. Internal Working of HashMap 3. Difference Between ArrayList vs Linked List. 4. WAP to reverse a String 5. dependency Injections 6. IOC Container 7. Singleton Class

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