Principal Global Services Software Developer Interview Questions and Answers for Experienced

Q1. What is a thread in java
Ans. 
A thread in Java is a lightweight process that allows concurrent execution of code within a program.
• Threads enable multitasking within a single program, improving efficiency.

• Java provides the Thread class and Runnable interface to create threads.

• Example: Implementing Runnable interface to define a thread's task.

• Threads can be started using the start() method and can be managed using methods like sleep(), join(), and in...read more
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Q2. Diff btw union and union all in sql
Ans. 
UNION combines unique records from two queries; UNION ALL includes all records, including duplicates.
• UNION removes duplicate rows from the result set.

• UNION ALL retains all rows, including duplicates.

• Example of UNION: SELECT name FROM table1 UNION SELECT name FROM table2;

• Example of UNION ALL: SELECT name FROM table1 UNION ALL SELECT name FROM table2;

• UNION may be slower due to duplicate elimination, while UNION ALL is ge
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Q1. Anagrams in java
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Q2. Reverse s string
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Q1. Oops concept and c# basic questions for freshers and sql basics
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Q2. What is .net framework
Ans. 
.NET Framework is a software framework developed by Microsoft that provides a runtime environment for building and running applications.
• .NET Framework is a platform for developing and running applications on Windows.

• It includes a large library of pre-built code and a runtime environment for executing applications.

• It supports multiple programming languages such as C#, VB.NET, and F#.

• It provides features like memory mana...read more
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Q3. Stored procesure insert update syntax
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Q4. Oops questions inheritance constructors
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Q5. Joins in sql and types
Ans. 
Joins in SQL are used to combine rows from two or more tables based on a related column between them.
• There are different types of joins in SQL: inner join, left join, right join, and full outer join.

• Inner join returns only the matching rows from both tables.

• Left join returns all the rows from the left table and the matching rows from the right table.

• Right join returns all the rows from the right table and the matching ...read more
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Q1. Basic oops concepts
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Q2. Web api questions
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Q1. What lib list ?
Ans. 
A list of libraries used in software development.
• Common libraries like React, Angular, jQuery

• Backend libraries like Express, Django, Spring

• Database libraries like Sequelize, SQLAlchemy, Hibernate
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Q2. What is Physical file
Ans. 
A physical file is a file stored on a physical storage device, such as a hard drive or solid-state drive.
• Physical files are stored on physical storage devices like hard drives or SSDs.

• They can be accessed and manipulated by software applications.

• Examples include text documents, images, videos, and executable programs.
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Q1. What is batch job
Ans. 
A batch job is a program that processes a large amount of data in a single run without user interaction.
• Batch jobs are typically scheduled to run at specific times, often during off-peak hours.

• They are commonly used for tasks such as data processing, report generation, and system maintenance.

• Examples of batch job tools include cron in Unix/Linux systems and Task Scheduler in Windows.
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Q2. What is interctive job
Ans. 
An interactive job is a task or project that requires active participation and engagement from the user.
• Interactive jobs involve real-time feedback and communication between the user and the system.

• Examples include video games, online surveys, and interactive websites.

• Users have control over the outcome of the task based on their input and decisions.
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Q1. Reverse words in a string
Ans. 
Reverse words in a string
• Split the string into an array of words

• Reverse the order of the words in the array

• Join the words back together into a single string
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Q2. Maximum subarray
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