Java流-peek和skip

Question

Stream.of(1, 2, 3, 4, 5, 6, 7, 8, 9)
    .peek(x -> System.out.print("A" + x))
    .skip(6)
    .peek(x -> System.out.print("B" + x))
    .forEach(x -> System.out.println("C" + x));

A1A2A3A4A5A6A7B7C7
A8B8C8
A9B9C9

Answer 1

我认为这个例子是不必要的迟钝。

这里实际上是完全相同的问题，但我相信输出使它更清楚地发生了什么。它在流中为每个项打印一行。

Stream.of(1, 2, 3, 4, 5, 6, 7, 8, 9)
    .peek(x -> System.out.println())                //always prints
    .peek(x -> System.out.print("A" + x + " "))     //always prints
    .skip(6)                                        //"conditional"
    .forEach(x -> System.out.print("B" + x));       //sometimes prints

输出

A1 
A2 
A3 
A4 
A5 
A6 
A7 B7
A8 B8
A9 B9