What is a filter() method in Java 8?

The filter method is used to filter elements that satisfy a certain condition that is specified using a Predicate function.

A predicate function is nothing but a function that takes an Object and returns a boolean.

public class Java8FilterExample {

    public static void main(String[] args) {

        List<String> list = Arrays.asList("One","Two","Three");

        List<String> filteredList = list.stream().filter(x -> x.length()>=5).collect(Collectors.toList());

        System.out.println(filteredList); // prints [Three]
    }
}

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