Java DoubleStream boxed()用法及代码示例

DoubleStream boxed()返回由该流的元素组成的Stream，每个元素都装在Double中。

注意：DoubleStream boxed()是中间操作。这些操作总是很懒。在Stream实例上调用中间操作，并在完成处理后将中间实例作为输出提供。
用法:

Stream<Double> boxed()

参数：

Stream : 支持顺序和并行聚合操作的一系列元素。
Double : Double类将原始类型double的值包装在对象中。类型为Double的对象包含一个类型为double的单个字段。

返回值：该函数将装箱的流返回到Double。

示例1:

// Java code for DoubleStream boxed() 
import java.util.*; 
import java.util.stream.Stream; 
import java.util.stream.DoubleStream; 
  
class GFG { 
  
    // Driver code 
    public static void main(String[] args) 
    { 
        // Creating an DoubleStream 
        DoubleStream stream = DoubleStream.of(3.2, 8.4, 3.6, 4.7); 
  
        // Creating a Stream of Doubles 
        // Using DoubleStream boxed() to return 
        // a Stream consisting of the elements 
        // of this stream, each boxed to a Double. 
        Stream<Double> stream1 = stream.boxed(); 
  
        // Displaying the elements 
        stream1.forEach(System.out::println); 
    } 
}

输出：

3.2
8.4
3.6
4.7

示例2:

// Java code for DoubleStream boxed() 
import java.util.*; 
import java.util.stream.Stream; 
import java.util.stream.DoubleStream; 
  
class GFG { 
  
    // Driver code 
    public static void main(String[] args) 
    { 
        // Creating an DoubleStream 
        DoubleStream stream = DoubleStream.of(3.2, 8.4, 3.6, 4.7); 
  
        // Creating a Stream of Doubles 
        // Using DoubleStream boxed() to return 
        // a Stream consisting of the elements 
        // of this stream, each boxed to a Double. 
        Stream<Double> stream1 = stream.boxed(); 
  
        Stream<Object> stream2 = Stream.concat(stream1, 
                                   Stream.of("Geeks", "for", "Geeks")); 
  
        // Displaying the elements 
        stream2.forEach(System.out::println); 
    } 
}

输出：

3.2
8.4
3.6
4.7
Geeks
for
Geeks

相关用法

注：本文由纯净天空筛选整理自Sahil_Bansall大神的英文原创作品 DoubleStream boxed() in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。