Amdocs Software Developer Interview Questions, Process, and Tips

2 Questions - Both Java based

Q1. Questions on project
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Round duration - 90 minutes
Round difficulty - Medium

This was an online coding round where we had 2 questions to solve under 90 minutes . Both the questions were of easy to medium difficulty .

Q1. 
Nth Fibonacci Number Problem Statement
Calculate the Nth term in the Fibonacci sequence, where the sequence is defined as follows: F(n) = F(n-1) + F(n-2), with initial conditions F(1) = F(2) = 1.
Input:
...read more
Ans. 
Calculate the Nth Fibonacci number efficiently using dynamic programming.
• Use dynamic programming to store and reuse previously calculated Fibonacci numbers.

• Start with base cases F(1) and F(2) as 1, then calculate subsequent Fibonacci numbers.

• Optimize the solution to avoid redundant calculations and improve efficiency.
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Q2. 
Subarray with Equal Occurrences Problem Statement
You are provided with an array/list ARR of length N containing only 0s and 1s. Your goal is to determine the number of non-empty subarrays where the numbe...read more
Ans. 
Count the number of subarrays where the number of 0s is equal to the number of 1s in a given array of 0s and 1s.
• Iterate through the array and keep track of the count of 0s and 1s encountered so far.

• Use a hashmap to store the count of 0s and 1s encountered at each index.

• For each index, check if the count of 0s is equal to the count of 1s encountered so far and update the total count accordingly.
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Round duration - 60 Minutes
Round difficulty - Medium

This round consisted of 1 question from DSA with medium level of difficulty and then the rest of the questions were asked from DBMS and OOPS. I was also made to execute a SQL query in my laptop .

Q1. 
Cycle Detection in a Singly Linked List
Determine if a given singly linked list of integers forms a cycle or not.
A cycle in a linked list occurs when a node's next points back to a previous node in the ...read more
Ans. 
Detect if a singly linked list forms a cycle by checking if a node's next pointer points back to a previous node.
• Use Floyd's Cycle Detection Algorithm to determine if there is a cycle in the linked list.

• Maintain two pointers, one moving at twice the speed of the other, and check if they meet at any point.

• If the fast pointer reaches the end of the list (null), there is no cycle.

• If the fast and slow pointers meet at some
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Q2. What is an Inner Join in SQL?
Ans. 
Inner Join in SQL is used to combine rows from two or more tables based on a related column between them.
• Inner Join returns only the rows that have matching values in both tables

• It is the most common type of join used in SQL

• Syntax: SELECT columns FROM table1 INNER JOIN table2 ON table1.column = table2.column

• Example: SELECT orders.order_id, customers.customer_name FROM orders INNER JOIN customers ON orders.customer_id =
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Q3. What is the difference between overloading and overriding?
Ans. 
Overloading is having multiple methods in the same class with the same name but different parameters, while overriding is implementing a method in a subclass that is already defined in the superclass.
• Overloading involves multiple methods with the same name but different parameters.

• Overriding involves implementing a method in a subclass that is already defined in the superclass.

• Overloading is determined at compile time ...read more
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Q4. Can you explain the Singleton Class in Java?
Ans. 
Singleton class in Java ensures that a class has only one instance and provides a global point of access to it.
• Singleton class restricts the instantiation of a class to one object.

• It provides a way to access its unique instance globally.

• Commonly implemented using a private constructor, static method, and a static instance variable.

• Example: Logger class in Java can be implemented as a Singleton to ensure only one instan
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Round duration - 60 Minutes
Round difficulty - Medium

This was a mixed round where I was asked to code 1 basic Programming question and later I was asked some important
concepts from Operating Systems/Linux and the famous SOLID principles from Object Oriented Design .

Q1. 
Merge Sort Problem Statement
You are given a sequence of numbers, ARR. Your task is to return a sorted sequence of ARR in non-descending order using the Merge Sort algorithm.
Explanation:
The Merge Sort...read more
Ans. 
Implement Merge Sort algorithm to sort a sequence of numbers in non-descending order.
• Divide the input array into two halves recursively until each array has only one element.

• Merge the sorted halves to produce a completely sorted array.

• Time complexity of Merge Sort is O(n log n).

• Example: Input: [3, 1, 4, 1, 5], Output: [1, 1, 3, 4, 5]
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Q2. How can you print numbers from 1 to 100 using more than two threads?
Ans. 
Use three threads to print numbers from 1 to 100 in sequence.
• Create three threads, each responsible for printing numbers in a specific range (e.g. 1-33, 34-66, 67-100).

• Use synchronization mechanisms like mutex or semaphore to ensure proper sequencing of numbers.

• Thread 1 prints numbers 1-33, Thread 2 prints numbers 34-66, Thread 3 prints numbers 67-100.
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Q3. Can you explain piping in Unix/Linux?
Ans. 
Piping in Unix/Linux allows the output of one command to be used as the input for another command.
• Piping is done using the | symbol

• It helps in chaining multiple commands together

• Example: ls -l | grep .txt
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Q4. Can you explain the SOLID principles in Object-Oriented Design?
Ans. 
SOLID principles are a set of five design principles that help make software designs more understandable, flexible, and maintainable.
• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open/Closed Principle: Objects should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Subtypes should be substitutable for their base types.

• I - Interface Segregation...read more
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Round duration - 30 Minutes
Round difficulty - Easy

This is a cultural fitment testing round .HR was very frank and asked standard questions. Then we discussed about my role.

Q1. Why do you want to work at Amdocs?
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Q2. Why should we hire you?
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Basic java questions

Q1. Java technical questions
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Q1. Scenario based problem solving
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Q1. Basic discussion about previous company and work
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Q1. About Project technicalities and technologies used
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Q1. The interview consisted of some very basic Java Questions as I applied for Java Role, basic theory concepts like "Collection Interface, super, this keywords and their use, Inheritance concepts, Memory conc...read more
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Q1. Simple communication skills and role description , its quite easy
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Q2. Make sure to ask everything about the role first.
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90 min Test with multiple choice questions

Q1. Technical Interview on Java as I was applying for it also some hands on on some imp topics
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