Oracle Senior Software Engineer Interview Questions and Answers

Q1. Write polyfill for array map
Ans. 
Polyfill for array map function in JavaScript
• Create a function called myMap that takes a callback function as an argument

• Loop through the array and apply the callback function to each element

• Return a new array with the results of the callback function applied to each element
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Q1. Sort the array of 0,1,2
Ans. 
Sort an array of strings containing '0', '1', and '2'.
• Use counting sort algorithm to count the occurrences of '0', '1', and '2'.

• Create a new array based on the counts of each element.

• Return the sorted array.
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Q2. All c++ core concepts and oops concept. Find second greatest element in an array without sorting.
Ans. 
Find the second greatest element in an array without sorting using C++ concepts.
• Iterate through the array to find the greatest element.

• While iterating, keep track of the second greatest element.

• Return the second greatest element once the iteration is complete.
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Q1. Design quick ecommerce site.
Ans. 
Designing a quick ecommerce site involves creating a user-friendly interface with easy navigation and secure payment options.
• Focus on a clean and intuitive user interface

• Implement a robust search functionality for products

• Include secure payment gateways like PayPal or Stripe

• Optimize site speed for quick loading times

• Ensure mobile responsiveness for on-the-go shopping

• Integrate customer reviews and ratings for trust-buil...read more
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Q2. Consumer producer multithreading program.
Ans. 
Consumer producer multithreading program involves multiple threads sharing a common buffer to produce and consume data.
• Use synchronized data structures like BlockingQueue to handle thread synchronization.

• Implement separate producer and consumer classes with run methods.

• Use wait() and notify() methods to control the flow of data between producer and consumer threads.
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Q3. Find missing and repeating element in an array of 1 to n elements. N is the size of array. Solve in O-n time and O-1 space.
Ans. 
Find missing and repeating element in an array of 1 to n elements in O(n) time and O(1) space.
• Iterate through the array and for each element, mark the element at index equal to its value as negative. If the element is already negative, it is the repeating element.

• After marking all elements, the positive element's index + 1 is the missing element.

• Example: Array ['1', '2', '3', '3', '5'] - Repeating element is '3' and mi...read more
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Q1. What is expected compensation
Ans. 
Expected compensation should be based on industry standards, experience, skills, and location.
• Research industry standards for Senior Software Engineer salaries

• Consider your level of experience and skills

• Take into account the cost of living in the location of the job

• Negotiate based on your value to the company
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Q1. Two sum problem in c sharp
Ans. 
The Two Sum problem involves finding two numbers in an array that add up to a specific target sum.
• Use a hash map to store the difference between the target and each element as you iterate through the array.

• Example: For array [2, 7, 11, 15] and target 9, store 7 in the map when you encounter 2.

• When you find 7 later in the array, you can retrieve 2 from the map, confirming they sum to 9.

• Time complexity is O(n) due to a s...read more
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Q2. What is inheritance in oops
Ans. 
Inheritance in OOP allows a class to inherit properties and behaviors from another class.
• Inheritance promotes code reusability by allowing a new class to use the properties and methods of an existing class.

• The class that is being inherited from is called the base class or parent class, while the class that inherits is called the derived class or child class.

• Derived classes can add new properties and methods, or overrid...read more
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Implement table tennis scorer

Q1. Java 8, Spring questions
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Q1. Design questions
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Q1. Salary discussion
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