Oracle Interview Questions, Process, and Tips for Experienced

Q1. 1. List and Arraylist Differences 2. What happens when element with same key is added into HashMap 3.Spring boot beans and how we can avoid bean instantiation 4.Profile annotation in spring 5.what are the ...read more
Ans. 
Explanation of differences between List and ArrayList, HashMap behavior with same key, Spring boot beans, Profile annotation in Spring, database configurations in pom.xml, and data structures.
• List is an interface while ArrayList is a class that implements List interface

• HashMap replaces the old value with the new value if the same key is added

• Spring boot beans can be avoided by using @Lazy annotation

• Profile annotation i...read more
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Q2. Programs: 1. Write program to return list of duplicate integer using int array 2. Write program to return square of integers in ascending order input:[-4,0,3,5] output:[0,9,16,25]
Ans. 
Program to return square of integers in ascending order from input array
• Iterate through the input array and calculate the square of each integer

• Store the squares in a new array and sort it in ascending order

• Return the sorted array of squares
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Q1. Kth node from behind for linked list
Ans. 
Find the Kth node from the end of a linked list
• Traverse the linked list to find the length of the list

• Calculate the position of the Kth node from the beginning

• Traverse the list again to find the Kth node from the end
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Level order traversal of Binary tree

Q1. Design payments infrastructure
Ans. 
Designing a robust and scalable payments infrastructure for efficient transactions.
• Identify the requirements of the payments system, including transaction volume, security, and integration with existing systems.

• Choose appropriate payment methods such as credit/debit cards, digital wallets, and bank transfers.

• Implement secure payment gateways to process transactions securely and efficiently.

• Consider compliance with regu...read more
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Q1. What is TestNG and its Real time usage
Ans. 
TestNG is a testing framework for Java that supports various testing levels and annotations.
• TestNG allows for easy configuration of test suites, test cases, and test methods.

• It supports parallel execution of tests, data-driven testing, and parameterization.

• TestNG provides detailed test reports and allows for grouping of test methods.

• Real-time usage includes automating test cases for web applications, API testing, and i
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Q1. Overview of HCM modules worked upon
Ans. 
Worked on various HCM modules including Core HR, Payroll, Time and Attendance, Benefits Administration.
• Implemented Core HR module to manage employee information, organizational structure, and job positions.

• Configured Payroll module to process employee salaries, deductions, and taxes accurately.

• Managed Time and Attendance module to track employee work hours, leaves, and overtime.

• Administered Benefits Administration modu...read more
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