Java Streams - Stream concat(Stream a, Stream b) example

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Stream concat(Stream<? extends T> a, Stream<? extends T> b) creates a concatenated stream.

Syntax

concat has the following syntax.

static <T> Stream<T> concat(Stream<? extends T> a,   Stream<? extends T> b)

Example

The following example shows how to use concat.

import java.util.Arrays;
import java.util.List;
import java.util.stream.Stream;
//w ww.ja  v  a  2s.  co m
public class Main {
  public static void main(String[] args) {
    List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);
    List<Integer> numbers1 = Arrays.asList(1, 2, 3, 4, 5);
    
    Stream<Integer> s = Stream.concat(numbers.stream(),
        numbers1.stream()); 
                     

    System.out.println(s.count());
  }
}

The code above generates the following result.

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