Nexgile Technologies Java Developer Interview Questions and Answers

DSA questions such as Map, linked list

Three were basic questions around strings and arrays

Q1. Detailed discussion on data structures and algorithms
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Code Snept question with 3-4 Reasoning question. Google form

Pen paper coding round. String , Array . Linkedlist , graph, questions

Q1. Maximum Spaning
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Q2. Nearest Prime number
Ans. 
To find the nearest prime number, iterate from the given number in both directions until a prime number is found.
• Start iterating from the given number in both directions to find the nearest prime number.

• Check if a number is prime by dividing it by all numbers less than its square root.

• Keep track of the closest prime number found during the iteration.
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Q3. Second Maximum Number in Array
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Find the second maximum number in an array of strings.
• Convert the array of strings to an array of integers.

• Sort the array in descending order.

• Return the second element in the sorted array.
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Q1. Project Question
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Q2. Robot question of DSA
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Q3. Stock Buy and sell - VI . Leetcode Hard
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Q4. Leetcode Medium
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18 non technical MCQ question with Aptitude, English

Q1. Check Palindrome
Ans. 
A palindrome is a word, phrase, number, or other sequence of characters that reads the same forward and backward.
• Create a function to check if a given string is a palindrome.

• Remove all non-alphanumeric characters and convert the string to lowercase before checking.

• Compare characters from both ends of the string to determine if it is a palindrome.
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Q2. Compare the object using Instance of Keyword
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Instance of keyword is used to compare an object to a specified class type.
• Instance of keyword returns true if the object is an instance of the specified class.

• It can be used to check if an object is of a specific class type before casting.

• Example: if(obj instanceof String) { // do something }
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Q3. Method overloading and Method Overriding program
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It was moderate. Can clear easily.

Q1. They asked about what whatever skills you written in resume.
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The codinds questions were too easy.

Q1. Cover the OOPS, Exception Handling, Collections,Arrays, Strings
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We can easily pass the test cases

Q1. OOPS, Exception Handling, Collections, Arrays, Strings
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Q2. What is Interface
Ans. 
Interface in Java is a reference type, similar to a class, that can contain only constants, method signatures, default methods, static methods, and nested types.
• Interfaces are used to define a contract for classes that implement them.

• Classes can implement multiple interfaces in Java.

• Interfaces cannot have instance fields, constructors, or non-static methods.

• Example: interface Shape { void draw(); }

• Example: class Circle...read more
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Q3. What is Abstractin
Ans. 
Abstraction is a concept in object-oriented programming where only relevant data is shown to the user while hiding unnecessary details.
• Abstraction helps in simplifying complex systems by only showing essential features.

• It allows for creating abstract classes and interfaces in Java.

• Example: In a car, the driver only needs to know how to drive it without understanding the internal workings of the engine.
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Q4. Explain about Exception and Exception handling
Ans. 
Exceptions are unexpected events that disrupt the normal flow of a program. Exception handling is the process of dealing with these events.
• Exceptions are objects that represent an abnormal condition or error in a program.

• Exception handling allows developers to gracefully handle errors and prevent the program from crashing.

• Java provides try-catch blocks for handling exceptions. The try block contains the code that may t...read more
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Q5. Explain Arrays and Strinds
Ans. 
Arrays are a collection of elements of the same data type, while Strings are a sequence of characters.
• Arrays can store multiple values of the same data type, accessed by index.

• Strings are immutable sequences of characters, can be manipulated using various methods.

• Example: int[] numbers = {1, 2, 3}; String name = "John";
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It was done on hackerrank the first question was related to array and second was on linked list and last was on sql

Q1. Oops concept stack program SQL basics
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Q1. Normal question related to me and job
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