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sequential / parallelsequential 返回的流是串行处理（默认就是，可以不写）parallel返回的流是并行处理，参考如下测试用例：@Test public void test12() throws Exception { IntStream intStream = IntStream.of(6, 1, 1, 2, 5, 2, 3, 4); long start=System.currentTimeMillis();