Top coding interview questions & answers Part-1 👇👇

1. What is the difference between a stack and a queue?
A stack is a data structure that follows the Last-In-First-Out (LIFO) principle, meaning that the last element added is the first one to be removed. A queue, on the other hand, follows the First-In-First-Out (FIFO) principle, where the first element added is the first one to be removed.

2. Explain the concept of recursion.
Recursion is a programming technique where a function calls itself to solve a problem. It involves breaking down a complex problem into smaller sub-problems until a base case is reached, which allows the function to stop calling itself and start returning values.

3. What is the time complexity of various sorting algorithms?
Some common sorting algorithms and their time complexities are:
- Bubble Sort: O(n^2)
- Insertion Sort: O(n^2)
- Selection Sort: O(n^2)
- Merge Sort: O(n log n)
- Quick Sort: O(n log n)
- Heap Sort: O(n log n)

4. What is the difference between an abstract class and an interface?
An abstract class can have both implemented and unimplemented methods, while an interface can only have unimplemented methods. A class can extend only one abstract class but can implement multiple interfaces.

5. What is the difference between a deep copy and a shallow copy?
A shallow copy creates a new object that references the same memory locations as the original object, while a deep copy creates a new object with its own memory and copies the values from the original object.

6. Explain the concept of polymorphism.
Polymorphism is the ability of an object to take on many forms. It allows objects of different classes to be treated as objects of a common superclass. This enables code to be written that can work with objects of different classes, as long as they share a common interface or superclass.

7. What is the difference between an instance variable and a static variable?
An instance variable belongs to an instance of a class and has separate copies for each instance. A static variable, on the other hand, belongs to the class itself and is shared by all instances of that class.

8. How does garbage collection work in Java?
Garbage collection in Java automatically frees up memory by deallocating objects that are no longer reachable or in use. The Java Virtual Machine (JVM) keeps track of all objects and their references, and periodically identifies and removes objects that are no longer needed.

9. Explain the concept of encapsulation.
Encapsulation is the practice of hiding internal details of an object and providing access to its functionality through well-defined interfaces. It helps in achieving data abstraction, data hiding, and code modularity.

10. What is the difference between a linked list and an array?
An array is a fixed-size data structure that stores elements in contiguous memory locations, allowing for random access using indices. A linked list, on the other hand, is a dynamic data structure where elements are stored in separate nodes that contain references to the next node, allowing for efficient insertion and deletion but slower random access.

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