How do I use streams to filter a list in Java 8?

How do I use streams to filter a list in Java 8?

You can use the filter method of the Stream API 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 returns a new stream containing only the elements that match the predicate.

What if I want to filter objects instead of integers?

You can filter objects in a similar way. For instance, if you have a list of Person objects and want to filter by age, you can use: 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 judiciously.