Java 8 新機能 Iterable#forEach [改定]

旧記事：http://qiita.com/asahina_dev/items/44a5325b0192b729cd4c

正式リリースされてメソッド名がかわっていたので改定してみた。
ついでに lamuda で記述。

初期化

List<Integer> list =Arrays.asList(1,2,3,4,5,6,7,8,9,10,11);

通常

list.forEach(a -> { System.out.printf("consumer1: %5d %n", a);});

二種類

だめな例なんだろうな

list.forEach(
  ((Consumer<Integer>) a -> { System.out.printf("consumer2: %5d %n", a);})
  .andThen(            a -> { System.out.printf("consumer3: %5d %n", a * 3);}));

やるならこうだろうね。

Consumer<Integer> consumer4 = a->System.out.printf("consumer4: %5d %n", a);
Consumer<Integer> consumer5 = a->System.out.printf("consumer5: %5d %n", a*4);
list.forEach(consumer4.andThen(consumer5));

実行結果

consumer1:     1 
consumer1:     2 
consumer1:     3 
consumer1:     4 
consumer1:     5 
consumer1:     6 
consumer1:     7 
consumer1:     8 
consumer1:     9 
consumer1:    10 
consumer1:    11 

---

consumer2:     1 
consumer3:     3 
consumer2:     2 
consumer3:     6 
consumer2:     3 
consumer3:     9 
consumer2:     4 
consumer3:    12 
consumer2:     5 
consumer3:    15 
consumer2:     6 
consumer3:    18 
consumer2:     7 
consumer3:    21 
consumer2:     8 
consumer3:    24 
consumer2:     9 
consumer3:    27 
consumer2:    10 
consumer3:    30 
consumer2:    11 
consumer3:    33 

---

consumer4:     1 
consumer5:     4 
consumer4:     2 
consumer5:     8 
consumer4:     3 
consumer5:    12 
consumer4:     4 
consumer5:    16 
consumer4:     5 
consumer5:    20 
consumer4:     6 
consumer5:    24 
consumer4:     7 
consumer5:    28 
consumer4:     8 
consumer5:    32 
consumer4:     9 
consumer5:    36 
consumer4:    10 
consumer5:    40 
consumer4:    11 
consumer5:    44