Scan-IT Interview Questions and Answers

Reflection in Java allows programmatic access to information about the fields, methods, and constructors of loaded classes.

• Reflection provides the ability to examine and modify the behavior of classes, interfaces, and objects at runtime.

• It allows accessing and manipulating fields, methods, and constructors that are otherwise inaccessible.

• Reflection is commonly used in frameworks, libraries, and tools that require runti...read more

Reflection class in Java provides a way to examine or modify the behavior of methods, classes, interfaces at runtime.

• Reflection allows accessing private fields, methods, and constructors of a class.

• It enables dynamic loading of classes and creation of new objects.

• Used in frameworks like Spring and Hibernate for dependency injection and object-relational mapping.

• Example: Class.forName("com.example.MyClass") returns the

The contract between hashCode and equals method is that if two objects are equal according to equals method, their hash codes must be equal as well.

• The hashCode method returns an integer value that represents the object's unique identifier.

• The equals method is used to compare two objects for equality.

• According to the contract, if two objects are equal, their hash codes must be equal.

• If the hashCode method is overridden...read more

The equals() method compares the content of two strings, while the == operator compares their references.

• The equals() method returns true if the content of two strings is the same.

• The == operator returns true if the references of two strings are the same.

• Example: String str1 = "Hello"; String str2 = new String("Hello"); str1.equals(str2) returns true, but str1 == str2 returns false.

OOPs (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.

• OOPs focuses on creating objects that interact with each other to solve problems

• Key concepts include encapsulation, inheritance, polymorphism, and abstraction

• Encapsulation involves bundling data and methods that operate on the data into a single unit

• Inheritance allows one class to inherit proper...read more