Java 8 – Convert a Stream to List

A Java 8 example to show you how to convert a Stream to a List via Collectors.toList

Java8Example1.java

package com.favtuts.java8.stream;

import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class StreamConvertToList {
    
    public static void main(String[] args) {
        streamToListViaCollectorToList();
    }

    static void streamToListViaCollectorToList() {

        Stream<String> language = Stream.of("java", "python", "node");

        //Convert a Stream to List
        List<String> result = language.collect(Collectors.toList());

        result.forEach(System.out::println);
        
    }
}

Output

java
python
node

Yet another example, filter a number 3 and convert it to a List.

package com.favtuts.java8.stream;

import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class StreamConvertToList {
    
    public static void main(String[] args) {
        streamToListWithFiltering();
    }

    static void streamToListWithFiltering() {

        Stream<Integer> number = Stream.of(1, 2, 3, 4, 5);

        List<Integer> result2 = number.filter(x -> x != 3).collect(Collectors.toList());

        result2.forEach(x -> System.out.println(x));
        
    }

}

Output

1
2
4
5

Download Source Code

$ git clone https://github.com/favtuts/java-core-tutorials-examples

$ cd java-basic/java8/stream

References

• Java 8 Collectors JavaDoc
• Java 8 Streams filter examples
• Java 8 – How to convert a Stream to Array