Review a Stream
containing null
values.
Java8Examples.java
package com.mkyong.java8;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class Java8Examples {
public static void main(String[] args) {
Stream<String> language = Stream.of("java", "python", "node", null, "ruby", null, "php");
List<String> result = language.collect(Collectors.toList());
result.forEach(System.out::println);
}
}
output
java python node null //Solution
To solve it, uses
Stream.filter(x -> x!=null)
Java8Examples.javapackage com.mkyong.java8; import java.util.List; import java.util.stream.Collectors; import java.util.stream.Stream; public class Java8Examples { public static void main(String[] args) { Stream<String> language = Stream.of("java", "python", "node", null, "ruby", null, "php"); //List<String> result = language.collect(Collectors.toList()); List<String> result = language.filter(x -> x!=null).collect(Collectors.toList()); result.forEach(System.out::println); } }
output
java python node ruby phpAlternatively, filter with
Objects::nonNull
import java.util.List; List<String> result = language.filter(Objects::nonNull).collect(Collectors.toList());
References