The Collectors.toList returns a collector that accumulates the input elements into a new list.
Java 8 Stream collect to list example
The example filters a list of strings and transforms the stream into a list. We filter the list to include only strings whose length is equal to four.
import java.util.List;
import java.util.ArrayList;
import java.util.stream.Collectors;
public class JavaCollectToListEx {
public static void main(String[] args) {
List < String > programmingLanguages = new ArrayList < > ();
programmingLanguages.add("C");
programmingLanguages.add("C++");
programmingLanguages.add("Java");
programmingLanguages.add("Kotlin");
programmingLanguages.add("Python");
programmingLanguages.add("Perl");
programmingLanguages.add("Ruby");
// filter all four character words into a list
List < String > result = programmingLanguages.stream().filter(word -> word.length() == 4)
.collect(Collectors.toList());
System.out.println(result);
}
}
Output:
[Java, Perl, Ruby]