Amdocs Senior Java Developer Interview Questions, Process, and Tips

Round duration - 60 Minutes
Round difficulty - Medium

This round had 2 questions of DSA where I was asked to first explain my approach and then code it as well in a production ready manner . After that , I was asked some questions related to Operating Systems and Java .

Q1. 
Remove the Kth Node from the End of a Linked List
You are given a singly Linked List with 'N' nodes containing integer data and an integer 'K'. Your task is to delete the Kth node from the end of this Lin...read more
Ans. 
Remove the Kth node from the end of a singly linked list.
• Traverse the linked list to find the length 'N'.

• Calculate the position to delete from the beginning as 'N - K + 1'.

• Delete the node at the calculated position.

• Handle edge cases like deleting the head or tail node.
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Q2. 
Intersection of Linked List Problem
You are provided with two singly linked lists containing integers, where both lists converge at some node belonging to a third linked list.
Your task is to determine t...read more
Ans. 
Find the node where two linked lists merge
• Traverse both lists to find their lengths and the difference in lengths

• Move the pointer of the longer list by the difference in lengths

• Traverse both lists simultaneously until they meet at the merging node
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Q3. Can you explain the life cycle of a thread in Java?
Ans. 
The life cycle of a thread in Java involves creation, running, waiting, and termination.
• A thread is created using the 'new' keyword or by implementing the Runnable interface.

• The thread starts running when the start() method is called.

• During execution, a thread can enter a waiting state using methods like sleep() or wait().

• A thread terminates when its run() method completes or when the stop() method is called.
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Round duration - 60 Minutes
Round difficulty - Medium

This round also had 2 questions of DS/Algo where I coded one of them and then we switched our discussion to DBMS and OOPS ( particularly in Java ) .

Q1. 
Merge Two Sorted Linked Lists Problem Statement
You are provided with two sorted linked lists. Your task is to merge them into a single sorted linked list and return the head of the combined linked list.
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Ans. 
Merge two sorted linked lists into a single sorted linked list with linear time complexity and constant space usage.
• Create a dummy node to start the merged list

• Compare the values of the two linked lists and add the smaller value to the merged list

• Move the pointer of the merged list and the pointer of the smaller value list forward

• Continue this process until one of the lists is fully traversed

• Append the remaining elemen...read more
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Q2. 
LRU Cache Design Question
Design a data structure for a Least Recently Used (LRU) cache that supports the following operations:
1. get(key) - Return the value of the key if it exists in the cache; otherw...read more
Ans. 
Design a Least Recently Used (LRU) cache data structure that supports get and put operations with capacity constraint.
• Implement a doubly linked list to keep track of the order of keys based on their recent usage.

• Use a hashmap to store key-value pairs for quick access and update.

• When capacity is reached, evict the least recently used item before inserting a new item.
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Q3. What is the difference between the DELETE and TRUNCATE commands in DBMS?
Ans. 
DELETE removes specific rows from a table, while TRUNCATE removes all rows and resets auto-increment values.
• DELETE is a DML command, while TRUNCATE is a DDL command.

• DELETE can be rolled back, while TRUNCATE cannot be rolled back.

• DELETE triggers delete triggers, while TRUNCATE does not trigger them.

• DELETE is slower as it logs individual row deletions, while TRUNCATE is faster as it logs the deallocation of the data page...read more
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Q4. What is the garbage collector in Java?
Ans. 
Garbage collector in Java is a built-in mechanism that automatically manages memory by reclaiming unused objects.
• Garbage collector runs in the background to reclaim memory from objects that are no longer in use.

• It helps prevent memory leaks and optimize memory usage.

• Examples of garbage collectors in Java include Serial, Parallel, CMS, G1, and Z Garbage Collectors.
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Round duration - 50 Minutes
Round difficulty - Medium

This round was inclined towards some Low Level Design Principles and some concepts from Java .

Q1. Design a Railway Reservation System.
Ans. 
Railway Reservation System for booking train tickets
• Create a database to store train schedules, seat availability, and passenger information

• Develop a user interface for customers to search for trains, select seats, and make payments

• Implement a booking system to reserve seats and generate tickets

• Include features like seat selection, cancellation, and ticket printing

• Ensure security measures for payment processing and dat
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Q2. Why is Java considered platform-independent while the Java Virtual Machine (JVM) is platform-dependent?
Ans. 
Java is platform-independent because the code is compiled into bytecode which can run on any platform with a JVM, making the JVM platform-dependent.
• Java code is compiled into bytecode, which is a platform-independent intermediate code

• The JVM interprets and executes the bytecode on different platforms

• The JVM acts as a layer of abstraction between the Java code and the underlying platform

• The JVM is platform-dependent bec...read more
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