- Print the frequency of each alphabet for the given string. - Swap two numbers using constant space. - What is abstraction, encapsulation, and polymorphism with real-life examples. - What do you understand by static and final keywords.

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To print the frequency of each alphabet in a string, create a hashmap to store the count of each alphabet.
To swap two numbers using constant space, use XOR operation: a = a ^ b, b = a ^ b, a = a ^ b.
Abstraction is hiding the implementation details and showing only the necessary features. Encapsulation is bundling data and methods into a single unit. Polymorphism allows objects to be treated as instances of their parent class.
Static keyword is used to declare a variable or method that belongs to the class itself, not to instances. Final keyword is used to make a variable constant and unchangeable.

- Print the frequency of each alphabet for the given string. - Swap two numbers using constant space. - What is abstraction, encapsulation, and polymorphism with real-life examples. - What do you understand by static and final keywords.

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