Automatic Infotech Java Developer Interview Questions, Process, and Tips

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Q1. Collection framework of java?
Ans. 
The Collection framework in Java provides a set of interfaces and classes to store and manipulate groups of objects.
• Includes interfaces like List, Set, and Map, along with their implementations like ArrayList, HashSet, and HashMap.

• Provides algorithms like sorting and searching through the Collections class.

• Introduced in Java 2, it simplifies the process of storing and manipulating groups of objects.

• Allows for easy iter...read more
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Q2. What is indexing in SQL?
Ans. 
Indexing in SQL is a technique used to improve the performance of queries by creating a data structure that allows for faster retrieval of data.
• Indexes are created on columns in a database table to speed up the retrieval of rows that match a certain condition in a query.

• They work similar to the index in a book, allowing the database to quickly locate the rows that satisfy the query criteria.

• Indexes can be created using...read more
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Q3. What is trigger in sql?
Ans. 
A trigger in SQL is a set of SQL statements that automatically 'fires' or executes when a specified event occurs in a database.
• Triggers can be used to enforce business rules, perform auditing, or maintain referential integrity.

• There are two main types of triggers: 'BEFORE' triggers, which execute before an event, and 'AFTER' triggers, which execute after an event.

• Examples of events that can trigger a trigger include IN
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Q4. What is OOP ?
Ans. 
OOP stands for Object-Oriented Programming, a programming paradigm based on the concept of objects.
• OOP focuses on creating objects that contain data and methods to manipulate that data.

• Encapsulation, inheritance, and polymorphism are key principles of OOP.

• Examples of OOP languages include Java, C++, and Python.
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Q5. What is polymorphism?
Ans. 
Polymorphism is the ability of a single function or method to operate on different types of data.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: Animal superclass with subclasses Dog and Cat. Both Dog and Cat can be treated as Animals.
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