Xangars Solutions SQL Developer Interview Questions and Answers

Inheritance is a fundamental OOP concept allowing a class to inherit properties and methods from another class.

• Promotes code reusability by allowing a new class (subclass) to use methods and attributes of an existing class (superclass).

• Supports method overriding, enabling subclasses to provide specific implementations of methods defined in the superclass.

• Facilitates a hierarchical classification of classes, making it e...read more

SDLC (Software Development Life Cycle) is a structured process for developing software applications efficiently.

• 1. Requirement Analysis: Gathering and analyzing user requirements.

• 2. Planning: Defining the scope, resources, and timeline for the project.

• 3. Design: Creating architecture and design specifications for the software.

• 4. Implementation: Writing and compiling the code based on design specifications.

• 5. Testing: V...read more

High level languages are closer to human language, mid level languages are a mix of high and low level, and low level languages are closer to machine language.

• High level languages are easier to read and write, like Java or Python.

• Mid level languages provide a balance between high and low level, like C++.

• Low level languages are closer to machine language, like Assembly.

The final keyword in Java is used to restrict the user from changing the value of a variable, making a method not overrideable, or preventing a class from being subclassed.

• Final variables cannot be reassigned once initialized

• Final methods cannot be overridden in subclasses

• Final classes cannot be subclassed

• Final parameters in a method cannot be modified within the method

The '==' operator compares memory addresses of objects, while the .equals() method compares the content or value of objects.

• Use '==' for comparing memory addresses of objects.

• Use .equals() for comparing the content or value of objects.

• Example: String str1 = new String("hello"); String str2 = new String("hello"); str1 == str2 will return false, but str1.equals(str2) will return true.