Java 中的 LongStream parallel()
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，它可能会自己返回，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。这些操作总是偷懒。中间操作在流实例上被调用，在它们完成处理后，它们给出一个流实例作为输出。
语法:
LongStream parallel()
Where, LongStream is a sequence of
primitive long-valued elements and the function
returns a parallel LongStream.
下面给出了一些例子来更好地理解这个函数。 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
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
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
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