Hexaware Technologies Senior Software Developer Interview Questions and Answers

Map transforms each element of a collection, while flatMap transforms each element into a new collection and flattens the result.

• Map applies a function to each element of a collection and returns a new collection with the results

• FlatMap applies a function that returns a collection to each element of a collection, then flattens the result into a single collection

• Example: map([1, 2, 3], x => [x, x+1]) returns [[1, 2], [2...read more

Comparable is an interface used for comparing objects, while Comparator is a separate class used for custom sorting.

• Comparable is implemented by the class whose objects need to be compared, while Comparator is a separate class used for custom sorting.

• Comparable has a single method, compareTo(), which is used to compare objects, while Comparator has a method, compare(), for custom sorting logic.

• Comparable is used for na...read more