Java 中的 LongStream 盒装()

原文:https://www.geeksforgeeks.org/longstream-boxed-java/

LongStream box()返回一个由该流的元素组成的流，每个元素被装箱为一个 Long。 注: LongStream 盒装()是一个 的中级操作。 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:

Stream<Long> boxed()

参数:

  1. 流 : 支持顺序和并行聚合操作的元素序列。
  2. Long:Long 类在对象中包装一个长的基元类型的值。long 类型的对象包含类型为 Long 的单个字段。

返回值:该函数返回一个装箱为 Long 的流。

例 1 :

// Java code for LongStream boxed()
import java.util.*;
import java.util.stream.Stream;
import java.util.stream.LongStream;

class GFG {

    // Driver code
    public static void main(String[] args)
    {
        // Creating an LongStream
        LongStream stream = LongStream.range(3L, 8L);

        // Creating a Stream of Longs
        // Using LongStream boxed() to return
        // a Stream consisting of the elements
        // of this stream, each boxed to a Long.
        Stream<Long> stream1 = stream.boxed();

        // Displaying the elements
        stream1.forEach(System.out::println);
    }
}

输出:

3
4
5
6
7

例 2 :

// Java code for LongStream boxed()
import java.util.*;
import java.util.stream.Stream;
import java.util.stream.LongStream;

class GFG {

    // Driver code
    public static void main(String[] args)
    {
        // Creating an LongStream
        LongStream stream = LongStream.range(3L, 8L);

        // Creating a Stream of Longs
        // Using LongStream boxed() to return
        // a Stream consisting of the elements
        // of this stream, each boxed to a Long.
        Stream<Long> stream1 = stream.boxed();

        Stream<Object> stream2 = Stream.concat(stream1,
                                    Stream.of("Geeks", "for", "Geeks"));

        // Displaying the elements
        stream2.forEach(System.out::println);
    }
}

输出:

3
4
5
6
7
Geeks
for
Geeks

版权属于：月萌API www.moonapi.com，转载请注明出处

本文链接：https://moonapi.com/news/23966.html