How do I use the filter method in Java Streams API?

How do I use the filter method in Java Streams API?

The filter method in Java Streams API is used to filter elements based on a given predicate. You can use it like this: stream.filter(element -> condition).

Can you give me an example of filtering a list of integers?

Sure! Here's an example: List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5); List<Integer> evenNumbers = numbers.stream().filter(n -> n % 2 == 0).collect(Collectors.toList()); This will give you a list of even numbers.

What if I want to filter objects instead of integers?

You can filter objects in a similar way. For example, if you have a list of Person objects, you can filter by age: List<Person> adults = people.stream().filter(p -> p.getAge() >= 18).collect(Collectors.toList());.

Are there any performance considerations when using filter?

Yes, using filter can impact performance, especially with large datasets. It's important to consider the efficiency of the predicate and the overall stream operations.