Method overriding Method overloading Exception Java 8 Find the 2nd non repeating character from a string Find the sum of square of even numbers

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The question covers topics like method overriding, method overloading, exceptions, Java 8 features, and string manipulation.

Method overriding is when a subclass provides a specific implementation of a method that is already provided by its superclass.
Method overloading is when multiple methods have the same name but different parameters.
Exception handling is used to handle errors that occur during the execution of a program.
Java 8 introduced features like lambda expressions, functional interfaces, and streams.
To find the 2nd non-repeating character in a string, you can iterate through the string and use a HashMap to keep track of character frequencies.
To find the sum of squares of even numbers, you can iterate through an array of numbers, check if each number is even, and then calculate the square of the even numbers and sum them up.

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