WESCO International QA Engineer Interview Questions and Answers

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Advance aptitude questions which took 1 hour to solve

Advance Coding questions

Q1. What is multithreading in java?
Ans. 
Multithreading in Java allows multiple threads to execute concurrently within a single program.
• Multithreading helps in improving the performance of applications by utilizing multiple CPUs or CPU cores.

• Each thread runs independently and shares the same memory space.

• Java provides built-in support for multithreading through the java.lang.Thread class or implementing the java.lang.Runnable interface.

• Example: Creating a new...read more
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Q2. Detect a cycle in linkedList
Ans. 
Detecting a cycle in a linked list by using two pointers approach.
• Use two pointers approach - slow pointer moves one step at a time, fast pointer moves two steps at a time.

• If there is a cycle, the two pointers will eventually meet at some point.

• Check if the fast pointer reaches the end of the list (null) before meeting the slow pointer to determine if there is a cycle.
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Q1. Asked question related to selenium, java, API
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Q1. Postman details, what are variable ?
Ans. 
Variables in Postman are placeholders that can be used to store and reuse values in requests and scripts.
• Variables in Postman are denoted by enclosing them in double curly braces like {{variable_name}}

• Variables can be defined at different scopes such as global, environment, and local

• Variables can be used to store values like API keys, tokens, and dynamic data

• Variables can be dynamically updated using scripts or pre-req
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Q1. SQL in depth Different types of join
Ans. 
Different types of SQL joins include inner join, left join, right join, and full outer join.
• Inner join: Returns rows when there is a match in both tables

• Left join: Returns all rows from the left table and the matched rows from the right table

• Right join: Returns all rows from the right table and the matched rows from the left table

• Full outer join: Returns rows when there is a match in either table
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Q1. CI/ CD Pipeline
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Q2. Agile methodlogies
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Q1. Expected salary
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Q2. Ready to work in Hybdrid model
Ans. 
Yes, I am ready to work in a hybrid model.
• I have experience working in both remote and on-site environments.

• I am comfortable using collaboration tools like Slack, Zoom, and Jira.

• I am adaptable and can easily switch between working from home and in the office.
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Java questions based on string and 2d array

Q1. Abstract class vs interface
Ans. 
Abstract class is a class that can have both abstract and non-abstract methods, while an interface is a blueprint for a class that only contains abstract methods.
• Abstract class can have constructor while interface cannot.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Abstract class can have access modifiers for its members, while interface cannot.

• Interfaces are used to achieve mu...read more
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Q2. String programs
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