DXC Technology Software Engineer Interview Questions and Answers for Freshers

Check if a given string is a palindrome or not.

• A palindrome is a word, phrase, number, or other sequence of characters that reads the same forward and backward.

• To check if a string is a palindrome, compare the first and last characters, then the second and second-to-last characters, and so on.

• If all pairs match, the string is a palindrome. If any pair does not match, the string is not a palindrome.

DELETE removes specific rows, TRUNCATE removes all rows, DROP removes entire table.

• DELETE is a DML command, TRUNCATE and DROP are DDL commands.

• DELETE can have a WHERE clause to specify which rows to delete.

• TRUNCATE resets the table and cannot be undone.

• DROP removes the table and all associated objects.

• Example: DELETE FROM table WHERE id = 1;

• Example: TRUNCATE table;

• Example: DROP TABLE table;

4 Pillars of OOPs are Abstraction, Encapsulation, Inheritance, and Polymorphism.

• Abstraction: Hiding implementation details and showing only necessary information.

• Encapsulation: Binding data and functions together and restricting access to them.

• Inheritance: Creating new classes from existing ones, inheriting properties and methods.

• Polymorphism: Ability of objects to take on multiple forms or behaviors.

A class is a blueprint for creating objects that have similar attributes and behaviors.

• A class is a user-defined data type that encapsulates data and functions.

• It provides a way to organize and structure code.

• Objects are instances of a class.

• Classes can inherit properties and methods from other classes.

• Examples of classes in programming languages include String, Integer, and List.

Method overloading is a feature in OOP where multiple methods can have the same name but different parameters.

• Method overloading is used to improve code readability and reusability.

• The methods must have different parameters, either in number or type.

• Example: void print(int num), void print(String str), void print(int num1, int num2)

• Method overloading is resolved at compile-time based on the number and type of argu...read more