forEach vs forEachOrdered in Java 8 Stream

Question

I understand that these methods differ the order of execution but in all my test I cannot achieve different order execution.

Example:

System.out.prin         


        

Answer 1

forEach() method performs an action for each element of this stream. For parallel stream, this operation does not guarantee to maintain order of the stream.

forEachOrdered() method performs an action for each element of this stream, guaranteeing that each element is processed in encounter order for streams that have a defined encounter order.

take the example below:

    String str = "sushil mittal";
    System.out.println("****forEach without using parallel****");
    str.chars().forEach(s -> System.out.print((char) s));
    System.out.println("\n****forEach with using parallel****");

    str.chars().parallel().forEach(s -> System.out.print((char) s));
    System.out.println("\n****forEachOrdered with using parallel****");

    str.chars().parallel().forEachOrdered(s -> System.out.print((char) s));

Output:

****forEach without using parallel****

sushil mittal

****forEach with using parallel****

mihul issltat

****forEachOrdered with using parallel****

sushil mittal