Java中的LongStream并行（）

LongStream parallel()是Java.util.stream.LongStream 中的一个方法。这个方法返回一个并行的 LongStream，也就是说，它可能返回自己，要么是因为流已经存在，要么是因为底层流状态被修改为并行。

LongStream parallel() 是一个中间操作。这些操作总是懒惰的。在 Stream 实例上调用中间操作，在它们完成处理后，它们给出一个 Stream 实例作为输出。

句法 ：

LongStream parallel()

Where, LongStream is a sequence of 
primitive long-valued elements and the function 
returns a parallel LongStream.

下面给出了一些示例，以更好地理解该函数。
示例 1：

// Java program to demonstrate working of
// LongStream parallel() on a given range
import java.util.*;
import java.util.stream.LongStream;
  
class GFG {
  
    // Driver code
    public static void main(String[] args)
    {
        // Creating a stream of longs
        LongStream stream = LongStream.range(5L, 12L);
  
        System.out.println("The corresponding "
                           + "parallel LongStream is :");
        stream.parallel().forEach(System.out::println);
    }
}

输出 ：

The corresponding parallel LongStream is :
9
8
11
10
6
5
7

示例 2：

// Printing sequential stream for the
// same input as above example 1.
import java.util.*;
import java.util.stream.LongStream;
  
class GFG {
  
    // Driver code
    public static void main(String[] args)
    {
        LongStream stream = LongStream.range(5L, 12L);
  
        System.out.println("The corresponding "
                           + "sequential LongStream is :");
        stream.sequential().forEach(System.out::println);
    }
}

输出 ：

The corresponding sequential LongStream is :
5
6
7
8
9
10
11

示例 3：

// Java program to show sorted output
// of parallel stream.
import java.util.*;
import java.util.stream.LongStream;
  
class GFG {
  
    // Driver code
    public static void main(String[] args)
    {
        // Creating a stream of longs
        LongStream stream = LongStream.of(3L, 4L, 1L, 5L,
                                          2L, 3L, 9L);
  
        System.out.println("The sorted parallel"
                           + " LongStream is :");
        stream.parallel().sorted().forEach(System.out::println);
    }
}

输出 ：

The sorted parallel LongStream is :
4
2
3
9
3
5
1