Giant Eagle Senior Software Engineer Interview Questions and Answers

DSA medium and Java Coding Questions

Frontend coding questions in Js and React js

Q1. What are Hooks and life cycle in React
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Q2. Behavioural questions like leadership etc
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Q1. Salary Expectations
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Q2. Company Values and Mission
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Q1. What is ReactQuery?
Ans. 
ReactQuery is a library for managing server state in React applications.
• Provides hooks for fetching, caching, and updating data from APIs

• Automatically handles caching, background refetching, and stale data management

• Improves performance by reducing unnecessary network requests
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Q2. Have you used useMemo, useCallback
Ans. 
Yes, I have used useMemo and useCallback in React applications.
• Used useMemo to memoize expensive calculations and prevent unnecessary re-renders.

• Used useCallback to memoize functions and prevent unnecessary re-creations.

• Example: const memoizedValue = useMemo(() => calculateValue(a, b), [a, b]);

• Example: const memoizedFunction = useCallback(() => { doSomething(a, b); }, [a, b]);
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2 coding questions were asked one on string to remove the nested parantheses and form string.
Second question was- I was given a mapping array and a num array
Mapping - {6,2,0,7,1,8,3,4,5,9}
NUM- {996, 25, 225}
Output- 553, 08, 008}

Q1. Callback method in java and alternatives
Ans. 
Callback method in Java allows passing a function as an argument to another function. Alternatives include using interfaces, lambda expressions, and method references.
• Callback method allows passing a function as an argument to another function

• Alternatives include using interfaces, lambda expressions, and method references

• Example: Using Runnable interface in Java to pass a function as a callback
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Q2. Hashmap vs concurrent hashmap
Ans. 
Hashmap is not thread-safe, while ConcurrentHashMap is thread-safe and allows for concurrent access.
• Hashmap is not thread-safe and can lead to race conditions in a multi-threaded environment.

• ConcurrentHashMap is thread-safe and allows for concurrent access by multiple threads without the need for external synchronization.

• ConcurrentHashMap achieves thread-safety by dividing the map into segments, each of which can be lo...read more
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Q3. Different method to invoke methode with using constructor or variable
Ans. 
You can invoke a method using a constructor by creating an instance of the class and calling the method, or by using a variable that holds a reference to the method.
• Invoke method using constructor: ClassName obj = new ClassName(); obj.methodName();

• Invoke method using variable: ClassName obj = new ClassName(); Runnable r = obj::methodName; r.run();
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Q4. Ask many scenario based questions
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Q1. Its a normal questions which usually service based company asked
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Q2. Overall it is good
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Ask you to implement any solution like caching using LRU or LFU

Its a manager round where they discuss about u=your past experiences and also they tell you about the project

Q1. I think they gave you only based on your previous offer.
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Q2. Negotiate well with them . Don't accept just for the sake of an offer because further they will not change it until/ unless it is filling position.
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Q1. How can fragments communicate among themselves
Ans. 
Fragments can communicate among themselves using interfaces, shared view models, and activity callbacks.
• Use interfaces to define communication contract between fragments

• Implement the interface in the hosting activity and pass it to the fragments

• Use shared view models to share data between fragments

• Use activity callbacks like onActivityResult() to communicate between fragments
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Find cycle in a linked list

Q1. Design patterns
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Q2. IIS services questions
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Q1. Tree question, Traversing tree and finding node on given condition
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Q1. Questions about Garbage Collector, Internal Hash map workflow, Functional interface
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