Elevati Infotech Interview Questions and Answers

Method overloading is having multiple methods with the same name but different parameters. Method overriding is having a method in the subclass with the same name and parameters as in the superclass.

• Method overloading is done in the same class while method overriding is done in different classes.

• Method overloading is used to provide different ways of calling the same method while method overriding is used to provide a ...read more

Inheritance is a mechanism in OOP where a new class is derived from an existing class.

• It allows code reusability and saves time and effort in writing code.

• The derived class inherits the properties and methods of the base class.

• The derived class can also add new properties and methods or override the existing ones.

• It helps in achieving polymorphism and abstraction.

• Example: A Car class can be inherited by a SportsCar cla...read more

Optional class is used to handle null values in Java 8 and above.

• Optional class is a container object that may or may not contain a non-null value.

• It provides methods to check if a value is present or not, and to retrieve the value if it is present.

• It helps to avoid NullPointerExceptions and makes the code more readable and concise.

• Example: Optional name = Optional.ofNullable(person.getName());

• If person.getName() retur...read more

Exception handling in Spring Boot project

• Use @ExceptionHandler annotation to handle exceptions

• Use @ControllerAdvice to handle exceptions globally

• Use try-catch block to handle exceptions in specific methods

• Use ResponseEntity to return custom error messages

• Use logging to track and debug exceptions