How can I filter a list using Java Streams?

How can I filter a list using Java Streams?

You can use the filter method in Java Streams to filter elements based on a condition. For example, if you have a list of integers and want to filter out even numbers, you can do it like this: list.stream().filter(n -> n % 2 != 0).collect(Collectors.toList());

Can you explain how the filter method works?

Sure! The filter method takes a predicate (a function that returns true or false) and applies it to each element in the stream. Only the elements that return true are included in the resulting stream.

What if I want to filter objects in a list?

You can filter objects in a list similarly. For example, if you have a list of Person objects and want to filter by age, you can do: people.stream().filter(p -> p.getAge() > 18).collect(Collectors.toList());

Are there any performance considerations when using streams?

Yes, while streams can make your code more readable, they may have performance overhead due to the creation of intermediate objects. It's best to use them for larger datasets where readability is a priority.