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java9-n's Issues

Okunması gereken dokümanlar

https://www.yegor256.com/2017/10/03/java9.html
https://vividcode.io/5-things-made-easier-in-java-9/
https://alidg.me/blog/2016/12/30/least-significant-bits-of-java-9

Herbirince çok güzel özellikler anlatılmış:
2. linkte

  • Resource Reference kullanımında kolaylık

  • Optional.stream() new method

    final long count = Stream.of(
    Optional.of(1),
    Optional.empty(),
    Optional.of(2)
    ).flatMap(Optional::stream)
    .count();
    assertEquals(2, count);

  • private interface methods

  1. linkte
  • Reactive Programming alt yapısı:
    • Publisher & Subscriber & Flow
  • CompletableFuture'a timeout function'lar gelmiş
  • gün gün artışı stream yapıyor.
    birthday
    .datesUntil(LocalDate.now())
    .map....

Java10 : VAR notation

  • Örnekler hazırlanmalı
  • Lambda içerisindeki kullanımları
  • Method reference kullanımları
  • Diğer kısıtlamalar neler

Java 9 Stream offNullable kullanımı

dateOfRelease.entrySet().stream()
.flatMap(s -> Stream.ofNullable(s.getValue()))
.collect(Collectors.toList()).forEach(System.out::println);

için dateOfRelease map'ine value'su null olan bir entry koyman gerekiyor. Bu listede sadece key'i null olan bir tane entry var zaten onu stream ederkende null olması ile ilgilenmiyor.

Mesela:

    dateOfRelease.put("Java 15", null);

yaptığın durumda

Java 8'de
dateOfRelease.entrySet().stream()
.flatMap(s -> s.getValue().stream())
.collect(Collectors.toList()).forEach(System.out::println);

NullPointerException verecekti.

Birde java 8'de neydi Java 9 ile ne olduyuda göstermekte fayda var.

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