Perennial Systems Java Developer Interview Questions and Answers

Apttitude and Basic of CPP

Q1. String reverse program
Ans. 
A program to reverse a string in Java.
• Use StringBuilder class to reverse the string.

• Convert the string to a StringBuilder object, call reverse() method, and convert back to string.

• Example: String str = "hello"; StringBuilder sb = new StringBuilder(str); sb.reverse(); String reversed = sb.toString();
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Q2. Logical questions
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Q3. Project Information
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10 apti questions and 10 technical mcq on cpp

Q1. Oops concept question
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Q2. Sql queries on join
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Oops topic and aptitude

First round is online test of 3 virtual rounds consist of aptitude , and coding

Q1. Matrix multiplication
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Q2. Singly linked list
Ans. 
A singly linked list is a data structure where each element points to the next element in the list.
• Each node in the list contains data and a reference to the next node

• Traversal starts from the head node and follows the next pointers until the end

• Insertion and deletion can be done efficiently at the beginning or end of the list
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Q1. Linked list question to detect cycle
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Q2. Basic questions from JS
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Q1. Some questions related to my projects
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Q2. Some Questions related to my past experience
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Q1. Map reduce filter in javascript
Ans. 
Map, reduce, and filter are higher-order functions in JavaScript used to manipulate arrays.
• Map: Transforms each element in an array and returns a new array with the transformed elements.

• Reduce: Reduces an array to a single value by applying a function to each element.

• Filter: Creates a new array with elements that pass a certain condition.
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Q2. Exception handling
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Very easy roundand is it a program to implement Parallel Merge Sort and can measure the performance

Coding and decoding reasoning for the shield season is over now I am not sure

It is easy and you can clear it.

It was moderate and hard questions