10+ Plasticon Technologies Interview Questions and Answers

Using Java 8 Stream, find and print the name of the student with the second highest marks.

• Sort the students based on marks in descending order

• Skip the first student (highest marks) and find the second student

• Print the name of the second student

This code snippet counts the frequency of each character in a string using a hash map (dictionary in Python).

• Use a hash map (dictionary) to store character counts.

• Iterate through each character in the string.

• For each character, increment its count in the hash map.

• Example: For the string 'hello', the output will be {'h': 1, 'e': 1, 'l': 2, 'o': 1}.

Spring Boot simplifies Spring application development, while microservices enhance scalability and maintainability.

• Spring Boot offers auto-configuration, reducing boilerplate code. Example: Setting up a REST API with minimal configuration.

• Microservices architecture allows independent deployment of services, enhancing scalability. Example: A user service and an order service can be deployed separately.

• Spring provides a comprehensive framework for building applications, while S...read more

Return the kth element from the end of a linked list

• Traverse the linked list to find the length of the list

• Calculate the position of the kth element from the beginning

• Traverse the list again to find the kth element from the end

Iterate and insert values into a hashSet in Java

• Create a HashSet object

• Use a for loop to iterate over the elements to be inserted

• Call the add() method on the HashSet object to insert each element

Detects if a linked list has a cycle using Floyd's Tortoise and Hare algorithm.

• Use two pointers: slow and fast. Slow moves one step, fast moves two steps.

• If there's a loop, slow and fast will eventually meet.

• If fast reaches the end (null), the list has no loop.

• Example: For a list 1 -> 2 -> 3 -> 4 -> 2 (cycle), slow and fast meet at 2.

Redux is a predictable state container for JavaScript apps. Hooks are a new addition in React 16.8 that lets you use state and other React features without writing a class.

• Redux is a state management tool commonly used with React to manage application state in a predictable way

• Hooks are a new addition in React 16.8 that allow you to use state and other React features without writing a class

• Examples of hooks include useState, useEffect, useContext, etc.

A collection is a group of objects or data structures that are stored and manipulated together.

• Collections can be used to store and manage multiple elements of the same type.

• Examples of collections include arrays, lists, sets, and maps.

• Collections provide methods for adding, removing, and accessing elements within the group.

OOPS concepts are fundamental to object-oriented programming. They include inheritance, encapsulation, abstraction, and polymorphism.

• Inheritance allows a class to inherit properties and methods from another class.

• Encapsulation is the practice of hiding data and methods within a class, so they can only be accessed through public methods.

• Abstraction is the process of simplifying complex systems by breaking them down into smaller, more manageable parts.

• Polymorphism allows object...read more

Hash map is a data structure that stores key-value pairs and allows for efficient retrieval of values based on keys.

• Hash map uses a hash function to map keys to indices in an array.

• Collision handling is important in hash maps to deal with multiple keys hashing to the same index.

• Common operations on hash maps include insertion, deletion, and lookup.

• Example: HashMap<String, Integer> map = new HashMap<>(); map.put("key", 123); int value = map.get("key");