Stream forEachOrdered() method in Java with examples
Last Updated :
06 Dec, 2018
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Stream forEachOrdered(Consumer action) performs an action for each element of this stream, in the encounter order of the stream if the stream has a defined encounter order. Stream forEachOrdered(Consumer action) is a terminal operation i.e, it may traverse the stream to produce a result or a side-effect.
Syntax :
Java
Java
Java
void forEachOrdered(Consumer<? super T> action) Where, Consumer is a functional interface which is expected to operate via side-effects. and T is the type of stream elements.Note : This operation processes the elements one at a time, in encounter order if one exists. Performing the action for one element happens-before performing the action for subsequent elements. Example 1 : To print the elements of integer array in original order.
// Java code for forEachOrdered
// (Consumer action) in Java 8
import java.util.*;
class GFG {
// Driver code
public static void main(String[] args) {
// Creating a list of Integers
List<Integer> list = Arrays.asList(10, 19, 20, 1, 2);
// Using forEachOrdered(Consumer action) to
// print the elements of stream in encounter order
list.stream().forEachOrdered(System.out::println);
}
}
Output:
Example 2 : To print the elements of string array in original order.
10 19 20 1 2
// Java code for forEachOrdered
// (Consumer action) in Java 8
import java.util.*;
class GFG {
// Driver code
public static void main(String[] args) {
// Creating a list of Strings
List<String> list = Arrays.asList("GFG", "Geeks",
"for", "GeeksforGeeks");
// Using forEachOrdered(Consumer action) to
// print the elements of stream in encounter order
list.stream().forEachOrdered(System.out::println);
}
}
Output:
Example 3 : To print the characters at index 2 of string array in original order.
GFG Geeks for GeeksforGeeks
// Java code for forEachOrdered
// (Consumer action) in Java 8
import java.util.*;
import java.util.stream.Stream;
class GFG {
// Driver code
public static void main(String[] args) {
// Creating a Stream of Strings
Stream<String> stream = Stream.of("GFG", "Geeks",
"for", "GeeksforGeeks");
// Using forEachOrdered(Consumer action)
stream.flatMap(str-> Stream.of(str.charAt(2)))
.forEachOrdered(System.out::println);
}
}
Output:
G e r e
