Publicis Sapient Software Developer Interview Questions and Answers

Interface and abstract class are both used for abstraction in object-oriented programming.

• An interface is a collection of abstract methods that define a contract for a class to implement.

• An abstract class is a class that cannot be instantiated and may contain abstract methods.

• Interfaces are used to achieve multiple inheritance in Java.

• Abstract classes can have non-abstract methods and instance variables.

• An example...read more

Polymorphism is the ability of an object to take on many forms.

• It allows objects of different classes to be treated as if they were objects of the same class.

• It is achieved through method overriding and method overloading.

• Example: A shape class can have multiple subclasses like circle, square, etc. and all can be treated as shapes.

• Example: A method can have different implementations in different classes but with t...read more

Inheritance in Java allows a class to inherit properties and methods from another class.

• Inheritance is achieved using the 'extends' keyword.

• The class that is being inherited from is called the superclass or parent class.

• The class that inherits from the superclass is called the subclass or child class.

• Subclasses can access the public and protected members of the superclass.

• Inheritance promotes code reusability and ...read more

A program to check if a given number is a palindrome or not.

• Convert the number to a string.

• Reverse the string and compare it with the original string.

• If they are equal, the number is a palindrome.

• If not, the number is not a palindrome.

Paging and Segmentation are memory management techniques used by operating systems.

• Paging divides memory into fixed-size pages and stores them in physical memory.

• Segmentation divides memory into logical segments and stores them in physical memory.

• Paging allows for efficient use of physical memory and reduces fragmentation.

• Segmentation allows for protection and sharing of memory between processes.

• Examples of operat...read more

An array of objects can be used to implement a heterogeneous array.

• Each element in the array can be an object that represents a different data type.

• The objects can have different properties and methods based on their respective data types.

• For example, an element can be an object representing a string with a 'value' property and a 'length' method.