Method References - Lambda Expressions In Java 8: Tutorial 8

In this tutorial I go over a more compact, easy-to-read, and faster form of writing lambda expressions known as method references.

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[tcastock]

I chose to watch this to get an understanding of method references...I didn't need the whole performance spiel

[MrCodix]

List<String> list = Arrays.asList("Toby", "Anna", "Leroy", "Alex");
        List<String> filtered = new ArrayList<>();
                long start1 = System.currentTimeMillis();
        list.stream().filter(n -> n.length() ==
        long end1 = System.currentTimeMillis();
       
       
        long start = System.currentTimeMillis();
        for (String name: list){
           if (name.length() == 4) filtered.add(name);
        }
        Collections.sort(filtered);
        Iterator<String> iter = filtered.iterator();
       
        for(int i = 0; i < 2; i++) if(iter.hasNext())
        long end = System.currentTimeMillis();
       

[tarasg]

Hello! Try to swap these two blocks and you will see that system.out::println will be slower :))

[MrCodix]

0 milliseconds for old fashioned java 7 way, bloody 116 ms for java 8 "fast" way

[MrCodix]

54 ms when I comment old fashioned way out (with the iterator)