USHA International Java Developer Interview Questions and Answers

Q1. What is your weakness
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Q2. What is pn junction diode
Ans. 
A pn junction diode is a semiconductor device that allows current to flow in one direction only.
• Consists of p-type and n-type semiconductor materials

• When forward biased, allows current to flow easily

• When reverse biased, blocks current flow
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Q1. Linux vs Windows
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Linux is preferred for server-side development due to its stability and security, while Windows is more commonly used for desktop applications.
• Linux is open-source and free, making it cost-effective for development.

• Windows has a larger user base and more compatibility with software and hardware.

• Linux is known for its stability and security, making it a popular choice for server-side development.

• Windows is more commonly...read more
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Q2. Singleton Class
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Q3. Fail Fast vs Fail Safe
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Fail Fast focuses on detecting errors as soon as possible, while Fail Safe aims to continue operation despite errors.
• Fail Fast: Emphasizes immediate error detection to prevent further issues.

• Fail Safe: Prioritizes continued operation even in the presence of errors.

• Example: Fail Fast is commonly used in software development to catch bugs early in the development process.

• Example: Fail Safe is often seen in systems where ...read more
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Q4. HashMap and ConcurrentHashMap
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Q5. Immutable class
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Basic aptitude train, time and work distance

Q1. Basics about my project and 3 eazy level coding question
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Q1. Discuss about salary and work cultrue
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Q1. Simple question on the datatypes, DSA,
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Q2. Basic full stack questions
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Data structures, linq and .net core related questions

Q1. Angular and .net core related questions
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Q1. About salary discussion
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Basic oops concepts and .net core DI related questions

Angular intermediate level questions and .net coding on screen for questions like creating an Oauth syntax

Q1. Salary negotiation
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Q2. And brief about role and responsibility
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Round duration - 120 minutes
Round difficulty - Easy

Round duration - 90 minutes
Round difficulty - Medium

The round contains mcqs on core java , javascript , oops and two coding questions of data structures.
The exam was at 7pm
Platform was good

Q1. 
Submatrix Sum Query
Given a 2-dimensional array ARR with 'N' rows and 'M' columns, and a set of queries in a 2-dimensional array Queries of size 'K', each query contains four integers that denote the top-...read more
Ans. 
I added all column and rows and put them in hashmap with their frequencies and then loop over queries and traverse over the hashmap that how many values of sum range between that row of query.
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Q2. 
String Rotation Problem Statement
You are given a string named str and an integer D. Your task is to perform both left (anticlockwise) and right (clockwise) rotations on the given string by D units, start...read more
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My approach was to rotate first string until its length and if at any stage it become equal to another string printed true else check and if not print false.
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