How do I use filter and map with Java Streams?

Can you explain how to use filter and map with Java Streams?

Sure! In Java Streams, filter is used to select elements based on a condition, while map transforms each element.

Can you give me an example of using filter and map together?

Absolutely! For instance, if you have a list of integers and want to filter out even numbers and then square them, you can do:

List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);
List<Integer> result = numbers.stream()
    .filter(n -> n % 2 != 0) // filter odd numbers
    .map(n -> n * n) // square them
    .collect(Collectors.toList());

What will the result be for that example?

The result will be a list containing the squares of the odd numbers: [1, 9, 25].