Hemmersbach Service Desk Agent Interview Questions and Answers

Q1. Define marker interface
Ans. 
A marker interface is an interface with no methods used to mark a class as having a particular property or behavior.
• Marker interfaces are used to provide metadata about a class.

• They are often used in frameworks and libraries to indicate that a class should be treated in a special way.

• Examples include Serializable, Cloneable, and Remote interfaces in Java.

• Marker interfaces can also be used to enforce design patterns, su
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Q2. Define thread concurrency
Ans. 
Thread concurrency refers to multiple threads executing simultaneously in a program.
• Concurrency allows for efficient use of resources and can improve performance.

• However, it can also lead to race conditions and other synchronization issues.

• Synchronization mechanisms like locks and semaphores can be used to manage concurrency.

• Examples of concurrent programming languages include Java and Python's threading module.
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Q1. What is a pointer to pointer
Ans. 
A pointer to pointer is a variable that stores the memory address of another pointer variable.
• It is used to create dynamic data structures like linked lists and trees.

• It allows multiple levels of indirection.

• It is denoted by ** in C and C++.

• Example: int **ptr;

• Example: ptr = &p; where p is a pointer variable.
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Q2. Class, object, inheritance, polymorphism,dbms
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Q1. Four Pillars of OOPS in Java?
Ans. 
Encapsulation, Inheritance, Polymorphism, Abstraction are the four pillars of OOPS in Java.
• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Inheritance: Allows a class to inherit properties and behavior from another class.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the implementation details and showing only the necessary features.
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Q2. What is a constructor in Java?
Ans. 
A constructor in Java is a special type of method that is used to initialize objects.
• Constructors have the same name as the class they are in.

• They do not have a return type, not even void.

• Constructors are called when an object of a class is created.

• Example: public class Car { public Car() { // constructor code } }
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45 questions were asked

3 questions were asked one from SQL and 2 from java

Q1. Oops concepts and java basics
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