Concise way to get a null safe Stream from a Collection.

Main.java

import java.util.*;

public class Main {

    public static void main(String[] args) {
        List<String> names = null;

        // NPE!!!
        names.stream().filter(Objects::nonNull).forEach(System.out::println);
        
        // It's ok! But instead of this...
        Optional.ofNullable(names).orElseGet(ArrayList::new).stream()
                .filter(Objects::nonNull)
                .forEach(System.out::println);
        
        // Use this!
        StreamUtil.ofNullable(names).filter(Objects::nonNull).forEach(System.out::println);
    }

}

StreamUtil.java

import java.util.Collection;
import java.util.Optional;
import java.util.stream.Stream;

public class StreamUtil {
    static <T> Stream<T> ofNullable(Collection<T> collection) {
        return Optional.ofNullable(collection).map(Collection::stream).orElseGet(Stream::empty);
    }
}