java 8新特性 并行流
使用并行流,提高cpu利用率,提高运算速度
/** * java 8并行流 * 底层运用fork join框架 */ @Test public void test(){ Instant start = Instant.now(); Long sum=LongStream.rangeClosed(0,100000000L) .parallel() .reduce(0,Long::sum); System.out.println(sum); Instant end = Instant.now(); System.out.println("耗时为:"+ Duration.between(start,end).toMillis());; //耗时为:141 } /** * 普通单线程 */ @Test public void test1(){ Long sum=0L; Instant start = Instant.now(); for (int i = 0; i <= 100000000L; i++) { sum+=i; } System.out.println(sum); Instant end = Instant.now(); System.out.println("耗时为:"+ Duration.between(start,end).toMillis());; //耗时为:648 }