Verifone Interview Questions, Process, and Tips

The duration of this round was around 20 minutes and there were 40 questions in total. This round consisted of standard mathematical, logical aptitude questions. Aptitude questions based on directions, speed and time, profit loss, etc. were asked. Out of 40 questions, around 15 questions were diagram based questions like finding the odd one, predicting the next pattern, etc.

The Second Round is an Online coding test that lasts for around 30 minutes to 1 hour. It was held on the coder byte platform. There were around 5-6 MCQs and 1 Coding Question. MCQ Questions - Predict the output, find errors, Simple language-based questions etc. The Coding Question was from Arrays, Strings, etc. For Example, You are given a string like “ONE PLUS THREE MINUS TWO” and you will have to give output as “TWO”

They will give you a frontend or Backend role based on your performance in Interviews Rounds.

Q1. 1. Heap theoretical questions were asked
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Q2. 2. Linked List theoretical
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Q3. 3. Reverse String was asked
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Q4. 4. Print FIBONACCI series
Ans. 
Print Fibonacci series
• Fibonacci series is a sequence of numbers where each number is the sum of the two preceding ones

• The first two numbers of the series are always 0 and 1

• The series can be generated using a loop or recursion

• Example: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181
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Q5. 5. Make Push Function for Queue, implement it using Array or Arraylist
Ans. 
Implement Push Function for Queue using Array or ArrayList
• Create a function that takes an array or ArrayList and a string as input

• Add the string to the end of the array or ArrayList

• Return the updated array or ArrayList
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Q6. 6. How to make an Arraylist and add 5 numbers in Arraylist
Ans. 
Create an ArrayList and add 5 numbers to it.
• Declare an ArrayList variable and initialize it

• Use the add() method to add numbers to the ArrayList

• Numbers can be of any data type (int, double, etc.)

• Example: ArrayList numbers = new ArrayList<>(); numbers.add(1);

• Make sure to import the ArrayList class
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Q7. 7. How is HASHMAP internally stored in Java?
Ans. 
HashMap in Java is internally stored as an array of linked lists.
• HashMap uses hashing to store key-value pairs

• Each key is hashed to an index in the array

• If there are collisions, a linked list is used to store multiple values at the same index

• The default initial capacity of HashMap is 16 and load factor is 0.75

• HashMap is not thread-safe and requires synchronization for concurrent access
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Q8. 8. OOPS Pillars were asked
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Q9. 9. Explain each pillar of OOPS with a real-life example
Ans. 
Explanation of OOPS pillars with real-life examples
• Abstraction: Hiding implementation details, e.g. using a TV remote without knowing how it works

• Encapsulation: Grouping related data and functions, e.g. a car's engine and transmission

• Inheritance: Creating new classes from existing ones, e.g. a sports car class inheriting from a car class

• Polymorphism: Using a single interface to represent multiple classes, e.g. a shape ...read more
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Q10. 10. Object and Classes
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Q11. 11. Overloading and Overriding explain with examples
Ans. 
Overloading and overriding are two concepts in object-oriented programming that allow methods to have multiple implementations.
• Overloading is when a class has multiple methods with the same name but different parameters.

• Overriding is when a subclass provides a different implementation of a method that is already defined in its superclass.

• Overloading is resolved at compile-time while overriding is resolved at runtime.

• Ex...read more
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Q1. 1. Why did you make this project?
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Q2. 2. What all features did you implement?
Ans. 
I implemented various features including X, Y, and Z.
• Implemented feature X which improved system performance by 20%

• Developed feature Y which allowed for real-time data analysis

• Added feature Z which improved user experience by simplifying the interface
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Q3. 3. How will you handle conflict within the team?
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