Tech Mahindra Java Developer Interview Questions and Answers for Experienced

Q1. Basic java questions
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Q1. How to make class immutable?
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To make a class immutable in Java, you can follow certain guidelines to ensure that its state cannot be changed once it is created.
• Make the class final so that it cannot be extended.

• Make all fields private and final to prevent modification.

• Do not provide setter methods for the fields.

• If the fields are mutable objects, return copies of them instead of the original objects in getter methods.
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Q2. What is idempotency? Solid ? Design patterns used in projects
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Idempotency is the property of an operation where multiple identical requests have the same effect as a single request.
• Idempotency ensures that even if the same request is made multiple times, the result will be the same.

• In RESTful APIs, using HTTP methods like GET and PUT can help achieve idempotency.

• Design patterns like Command Pattern and State Pattern can be used to ensure idempotency in projects.
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Aptitude is most imp past of interviews .
We should have clear the aptitude than go for the next level that is coding test

Coding is also most important part of all the candidates have good knowledge of all type codings

Q1. Oops concepts. Constructor . Inheritance Polymorphism Abstraction Encapsulation Static variables and Static blocks Collections. Multi threade Exception handling These are the questions of interviews
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Q2. Childe class access data from Perent class property called inheritance
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Q3. Constructor is a list of special method which has same name and same class called constructor. Constructor is use to initialise the data and initialise the instance variable
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Q4. Access private data public environment called encapsulation
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