Infosys Interview Questions, Process, and Tips

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Q2. I didn't like it
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Q3. Not interested to express
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Java test coding test Java javascript

Q1. How to create interface in java
Ans. 
Interfaces in Java define a contract for classes to implement certain methods and provide a way to achieve abstraction.
• Interfaces are declared using the 'interface' keyword in Java.

• All methods in an interface are abstract by default and do not have a method body.

• Classes can implement interfaces using the 'implements' keyword.

• Interfaces can be used to achieve multiple inheritance in Java.

• Example: public interface Shape
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Q2. Common Design patterns
Ans. 
Common design patterns are reusable solutions to common problems in software design.
• Creational patterns: Singleton, Factory, Builder

• Structural patterns: Adapter, Decorator, Facade

• Behavioral patterns: Observer, Strategy, Template Method
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Q1. Final keyword in Java
Ans. 
Final keyword in Java is used to restrict the user from changing the value of a variable, making it a constant.
• Final keyword can be applied to variables, methods, and classes

• Final variables must be initialized and cannot be reassigned

• Final methods cannot be overridden in subclasses

• Final classes cannot be subclassed
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Q2. Static keyword in Java
Ans. 
Static keyword in Java is used to create class-level variables and methods that can be accessed without creating an instance of the class.
• Static variables are shared among all instances of a class

• Static methods can be called without creating an object of the class

• Static blocks are used to initialize static variables
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Q1. What is OOPS ?
Ans. 
OOPS stands for Object-Oriented Programming System. It is a programming paradigm based on the concept of objects.
• OOPS is a way of organizing and designing code around objects

• Objects have properties (attributes) and methods (functions)

• Encapsulation, inheritance, and polymorphism are key concepts in OOPS

• Examples of OOPS languages include Java, C++, and Python
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Q2. What is Recursion and its program
Ans. 
Recursion is a process of calling a function within itself.
• Recursion is useful for solving problems that can be broken down into smaller sub-problems.

• It involves a base case and a recursive case.

• Examples include factorial, Fibonacci sequence, and binary search.

• Recursion can be memory-intensive and may cause stack overflow errors.

• Tail recursion optimization can be used to optimize recursive functions.
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