Bird Worldwide Flight Services Interview Questions and Answers

OOPs is Object Oriented Programming. Java and Python are both OOPs languages, but differ in syntax and usage.

• Java is statically typed, while Python is dynamically typed

• Java requires more verbose syntax, while Python is more concise

• Java is better suited for large-scale enterprise applications, while Python is better for scripting and data analysis

• Java has a stronger emphasis on performance, while Python prioritizes ease of use and readability

• Both languages support inheritance,...read more

Stack can be implemented using arrays or linked lists. It follows LIFO (Last In First Out) principle.

• Create an empty array or linked list

• Push elements onto the stack

• Pop elements from the stack

• Check if the stack is empty

• Example: Infix to Postfix conversion using stack

• Example: Undo/Redo functionality in text editors

Friend function in C++ is a non-member function that has access to the private and protected members of a class.

• Declared inside the class but defined outside the class scope

• Can access private and protected members of the class

• Can be used to overload operators

• Example: friend void display(A obj) { cout << obj.num; }

• Example: class A { friend void display(A obj); };

List and dictionary are data structures in programming.

• List is an ordered collection of elements, accessed by index. Example: [1, 2, 3]

• Dictionary is an unordered collection of key-value pairs. Example: {'name': 'John', 'age': 30}

• Lists use square brackets [] while dictionaries use curly braces {}

• Lists can contain duplicate values while dictionaries cannot have duplicate keys

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

• Create a function that takes a string as input

• Use two pointers, one starting from the beginning and one from the end, to compare characters

• Ignore spaces and punctuation while checking for palindrome

• Example: 'racecar' is a palindrome, 'hello' is not

Use StringBuilder class to reverse a string in Java.

• Create a StringBuilder object with the input string.

• Use the reverse() method of StringBuilder to reverse the string.

• Convert the StringBuilder back to a string using toString() method.