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Copy pathParallel.java
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38 lines (29 loc) · 876 Bytes
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package com.jcfc.stream.parallel;
import org.junit.Test;
import java.time.Duration;
import java.time.Instant;
import java.util.stream.LongStream;
import java.util.stream.Stream;
/**
* java8并行流:
* （底层实现是 Fork/Join 框架）
*
* 切换并行流:
* parallel()
* list.parallelStream()
* 切换穿行流:
* sequential()
*
*/
public class Parallel {
@Test
public void test() {
Instant start = Instant.now();
//LongStream.rangeClosed生成在开始和结束之间所有连续的数，closed是包含结束，不带是不包含
long sum = LongStream.rangeClosed(0, 100000000L)
.parallel()
.reduce(0, Long::sum);
Instant end = Instant.now();
System.out.println("耗费时间："+ Duration.between(start, end).toMillis());
}
}