In this tutorial, we will learn Java 8 Stream collect() terminal operation with an example.

The Java Stream collect() method is a terminal operation that starts the internal iteration of elements and collects the elements in the stream in a collection or object of some kind. 

Java Stream collect() Example

Here is a simple Java Stream collect() method example:

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

public class Main {
    public static void main(String[] args)
    {
        List<String> stringList = new ArrayList<String>();

        stringList.add("one");
        stringList.add("two");
        stringList.add("three");
        stringList.add("four");
        stringList.add("five");

        Stream<String> stream = stringList.stream();

        List<String> stringsAsUppercaseList = stream
                .map(value -> value.toUpperCase())
                .collect(Collectors.toList());

        System.out.println(stringsAsUppercaseList);

    }
}

Output:

[ONE, TWO, THREE, FOUR, FIVE]

Java Stream Methods/APIs Examples

1. Java Stream filter() Example
2. Java Stream map() Example
3. Java Stream flatMap() Example
4. Java Stream distinct() Example
5. Java Stream limit() Example
6. Java Stream peek() Example
7. Java Stream anyMatch() Example
8. Java Stream allMatch() Example
9. Java Stream noneMatch() Example
10. Java Stream collect() Example
11. Java Stream count() Example
12. Java Stream findAny() Example
13. Java Stream findFirst() Example
14. Java Stream forEach() Example
15. Java Stream min() Example
16. Java Stream max() Example
17. Java Stream reduce() Example
18. Java Stream toArray() Example

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