Java の Stream において pipeline を途中で止める方法 Java Stream pipeline IntStream stream = IntStream.of(1, 2, 3); stream.peek(i -> System.out.println("1st: " + i)) .peek(i -> System.out.println("2nd: " + i)) .peek(i -> System.out.println("3rd: " + i)) .sum(); 1st: 1 2nd: 1 3rd: 1 1st: 2 2nd: 2 3rd: 2 1st: 3 2nd: 3 3rd: 3 pipeline 1st peek() 1st: 1 1st: 2 1st: 3 2nd: 1 3rd: 1 2nd: 2 3rd: 2 2nd: 3 3rd: 3 sorted() sort IntStream stream = IntStream.of(1, 2, 3); stream.peek(i -> System.out.println("1st: " + i)) .sorted() .peek(i -> System.out.println("2nd: " + i)) .peek(i -> System.out.println("3rd: " + i)) .sum();

`peek()`Stream

`sorted()`Spliterator`SORTED``sorted()`""

2`peek`


IntStream stream = IntStream.of(1, 2, 3);
stream.forEach(i -> System.out.println("1st: " + i))

stream = IntStream.of(1, 2, 3);
stream.peek(i -> System.out.println("2nd: " + i))
.peek(i -> System.out.println("3rd: " + i))
.sum();


* * *

>

(`toArray()`)Stream""


IntStream stream = IntStream.of(1, 2, 3);
IntStream.of(
stream
.map(x -> x * 2)
.peek(i -> System.out.println("1st: " + i)) // for DEBUG
.toArray()
)
.peek(i -> System.out.println("2nd: " + i)) // for DEBUG
.peek(i -> System.out.println("3rd: " + i)) // for DEBUG
.sum();