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问题描述
与 Stream.findFirst()类似,有没有办法写 Stream.findNth()?
Similar to Stream.findFirst(), is there a way to write Stream.findNth()?
我正在通过重写一些遗留代码来练习Java 8。而且,我想知道如何使用Stream API编写以下函数。
I'm practicing Java 8 by rewriting some legacy code. And, I'm wondering how the below function can be written using Stream API.
static curPipeNumber = 0; /** skipToEntry() updates 'curPipeNumber' to 'pipeNumber' and returns the first byte position of the word before the ('pipeNumber')-th pipe. * It does so by reading and ignoring unnecessary bytes from the buffer. * e.g., */ static int skipToEntry(byte[] buf, int len, int nextByteToBeRead, int pipeNumber) { if(curPipeNumber == pipeNumber) return nextByteToBeRead; for(; nextByteToBeRead < len; nextByteToBeRead++) { if(buf[nextByteToBeRead] == '|') { ++curPipeNumber; if(curPipeNumber == pipeNumber) { return ++nextByteToBeRead; } } } return nextByteToBeRead; }我希望它能转化为:
static int skipToEntry(byte[] buf, int len, int nextByteToBeRead, int pipeNumber) { if(curPipeNumber == pipeNumber) return nextByteToBeRead; OptionalInt pipeIndex = IntStream.range(i, len) .filter(n -> buf[n] == '|') .findNth(pipeNumber); curPipeNumber = pipeNumber; nextByteToBeRead = pipeIndex.getAsInt() + 1; return nextByteToBeRead; }推荐答案
OptionalInt result = stream.skip(n-1).findFirst();
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如何对Stream.findNth()进行编码?
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