Gibraltar Technologies Java Developer Interview Questions and Answers

Q1. What are the design patterns you know in java
Ans. 
Design patterns in Java are reusable solutions to common problems in software design.
• Creational patterns (e.g. Singleton, Factory, Builder)

• Structural patterns (e.g. Adapter, Decorator, Facade)

• Behavioral patterns (e.g. Observer, Strategy, Template Method)
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Q2. What is daimond problem
Ans. 
The diamond problem occurs in multiple inheritance when a class inherits from two classes that have a common ancestor, leading to ambiguity in method invocation.
• Diamond problem arises in multiple inheritance when a class inherits from two classes that have a common ancestor.

• It leads to ambiguity in method invocation as the compiler cannot determine which inherited method to invoke.

• Example: Class A has a method 'display...read more
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Q1. Java concepts based on streams and oops concepts and singleton class
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Q2. DSA questions like first missing number and rotate array
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Q1. SQL queries based on group by and implementation of min heap
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Q2. Scenario based question like what data structure are used
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Q1. Java based questions like difference between interface and abstract class and spring boot rest API implementation
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Q2. Permutation of the number without duplicates
Ans. 
Generate all permutations of a given number without duplicates
• Use backtracking to generate all possible permutations

• Avoid duplicates by keeping track of used digits

• Recursively swap digits to generate permutations
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Q1. Min stack write code with full operation
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A min stack is a stack data structure that supports the usual push and pop operations, along with an additional operation to retrieve the minimum element in constant time.
• Create a stack to store the elements and another stack to store the minimum values encountered so far.

• When pushing an element, check if it is smaller than the current minimum. If so, push it onto the minimum stack.

• When popping an element, check if it ...read more
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Q2. Graph and sql ,concept problem
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Q1. Merge Sort based tricky ques
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Q2. Island problem leetcode
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Q1. Explain how hashmap internally works
Ans. 
HashMap internally uses an array of linked lists to store key-value pairs.
• HashMap uses hashing to determine the index of the key in the array.

• If multiple keys hash to the same index, a linked list is used to store them.

• When retrieving a value, the key is hashed to find the index and then the linked list is searched for the key.
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Q2. Difference between vector and Arraylist
Ans. 
Vector is synchronized and slower, ArrayList is unsynchronized and faster.
• Vector is synchronized, ArrayList is not.

• Vector is slower due to synchronization, ArrayList is faster.

• Vector is legacy class, ArrayList is part of Java Collections framework.

• Vector doubles its size when full, ArrayList increases by 50%.
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Q1. Java & advance java,spring Boot
Ans. 
I m to get yourlife company to work.
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Q2. Check my skills
Ans. 
It's like technical round & Hr round , way of language speaking.
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Q3. I ability to doing work hard in this company
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Q4. I'm have read to extra work form this company
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Q5. I hope I think about me good everything it's OK thank you my side.
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Q1. When will you start a company
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Q2. How Many location in company
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Q3. Who is the CEO of Zoho
Ans. 
Sir.Sridhar Vembu is the founder and CEO
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Q4. What is the high salary of Zoho
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Q5. Is Zoho a foreign company?
Ans. 
Yes, Zoho is a foreign company based in India.
• Zoho is headquartered in Chennai, India.

• It was founded by Sridhar Vembu in 1996.

• Zoho has offices in multiple countries including the United States, China, Japan, and Singapore.
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Ages, trains, profit losss, hcf lcm, clock, simple interest 30 min

Array string sorting algorithm

Part1 aptitude questions and part2 checking multiple programming language syntax such as python c#
java js shell script
part 3 on testing and devops
all are 10 qns from each part 30 mcqs