Red Hat Engineer Trainee Interview Questions and Answers

Basics leetcode with optimization was asked

They ask to many technical question and ask to code also

They ask for your background and thing you learnt in your past

Sort the arr, fetch element from array

Q1. Linklist search
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Q2. Sort in link List
Ans. 
Sorting in a linked list involves rearranging the elements in ascending or descending order based on a certain criteria.
• Use a sorting algorithm like bubble sort, selection sort, or merge sort to rearrange the elements in the linked list.

• Traverse the linked list and compare each element with the next one to determine the order in which they should be sorted.

• Update the pointers of the nodes in the linked list to reflect ...read more
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Basic aptitude on java application and framework

Q1. What is mutable type
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A mutable type is a data type whose values can be changed after they are created.
• Mutable types include lists, dictionaries, and sets in Python.

• Changes to mutable objects affect all references to that object.

• Example: list1 = [1, 2, 3], list1[0] = 4 will change the value of list1 to [4, 2, 3].
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Q2. What is functional interface
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A functional interface is an interface that contains only one abstract method.
• Functional interfaces can have multiple default or static methods.

• Examples include Runnable, Callable, and ActionListener interfaces.

• Functional interfaces can be implemented using lambda expressions.
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Q3. Updates in java 17
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Java 17 introduces new features like sealed classes, pattern matching for switch statements, and more.
• Sealed classes restrict which classes can be subclasses

• Pattern matching for switch statements simplifies code by combining declaration and assignment

• New APIs like JEP 356: Enhanced Pseudo-Random Number Generators
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