Cognizant Software Developer Interview Questions, Process, and Tips for Freshers

Q1. What is the difference between hashtable and hash map
Ans. 
Hashtable is synchronized and does not allow null keys, while hashmap is not synchronized and allows one null key.
• Hashtable is synchronized, while hashmap is not.

• Hashtable does not allow null keys, while hashmap allows one null key.

• Hashtable is thread-safe, while hashmap is not.

• Hashtable is slower than hashmap.

• Hashtable is part of the legacy collection classes, while hashmap is part of the Java Collections Framework.
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Basic to medium aptitude questions

Q1. Test you listening skills audio questions
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Q1. Basic to medium questions based on your resume
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Q1. What is array how it is used
Ans. 
An array is a data structure that stores a collection of elements of the same type in a contiguous memory location.
• Arrays are used to store multiple values in a single variable.

• Elements in an array are accessed by their index, starting from 0.

• Example: string[] names = {"Alice", "Bob", "Charlie"};

• Arrays can be used to efficiently store and retrieve data in programming.

• Arrays can be multidimensional, allowing for more co
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Q2. What is linklist
Ans. 
A linked list is a data structure that consists of a sequence of elements where each element points to the next element in the sequence.
• Each element in a linked list is called a node.

• Nodes in a linked list are connected by pointers or references.

• Linked lists can be singly linked (each node points to the next node) or doubly linked (each node points to the next and previous nodes).
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Q3. What is polymorphism
Ans. 
Polymorphism is the ability of a function or method to behave differently based on the object it is acting upon.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: Inheritance allows a child class to override a method from its parent class, exhibiting polymorphic b
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Basic simple maths questions

Asked to solve the two quetions using any language

Q1. Tell about urself
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Test was good, and nice experience. It was online.

Simple questions like BST, Sorting and DBMS very questions.

Q1. HR wanted to test communication skill.
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Q2. What is your fav sports, and what you would do if you become a PM.
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Q1. Which type of questions asking
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Q2. My Self is improve the skills and ability for the organizational goals as well as myself
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Q3. Which is a salary in your company for employee
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Q4. Which is a salary in our company working on employee
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Q5. Education is continues for my job profile
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Q6. Next Education continuesly for working of our company
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