How can I use the Java Streams API for filtering data?

How can I use the Java Streams API for filtering data?

You can use the filter method in the Java Streams 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 as an argument, which is a function that returns true or false. It processes each element in the stream and only keeps those that satisfy the condition defined in the predicate.

What are some common use cases for filtering with streams?

Common use cases include filtering collections based on specific criteria, such as removing duplicates, selecting items that meet certain conditions, or processing data from a database.

Can I chain multiple filters together?

Yes, you can chain multiple filter calls together. For example: list.stream().filter(n -> n > 10).filter(n -> n < 20).collect(Collectors.toList()); This will filter the list to include only numbers between 10 and 20.