Java中的 IntStream asDoubleStream()

IntStream asDoubleStream()返回由该流的元素组成的DoubleStream ，转换为双精度。这是一个中间操作。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：

DoubleStream asDoubleStream()
Where, DoubleStream is a sequence of 
primitive double-valued element.
Return Value : IntStream asDoubleStream() returns a
DoubleStream consisting of the elements of this stream, 
converted to double.

示例 1：

// Java code for DoubleStream asDoubleStream()
// to return a DoubleStream consisting of
// the elements of this stream
import java.util.*;
import java.util.stream.IntStream;
import java.util.stream.DoubleStream;
  
class GFG {
  
    // Driver code
    public static void main(String[] args)
    {
        // Creating an IntStream
        IntStream stream = IntStream.of(3, 5, 9, 12, 14);
  
        // Using DoubleStream asDoubleStream()
        DoubleStream stream1 = stream.asDoubleStream();
  
        // Displaying DoubleStream consisting of
        // the elements of this stream
        stream1.forEach(System.out::println);
    }
}

输出：

3.0
5.0
9.0
12.0
14.0

示例 2：

// Java code for DoubleStream asDoubleStream()
// to return a DoubleStream consisting of
// the elements of this stream
import java.util.*;
import java.util.stream.IntStream;
import java.util.stream.DoubleStream;
  
class GFG {
  
    // Driver code
    public static void main(String[] args)
    {
        // Creating an IntStream and using asDoubleStream()
        DoubleStream stream = IntStream.range(3, 8).asDoubleStream();
  
        // Displaying DoubleStream consisting of
        // the elements of this stream
        stream.forEach(System.out::println);
    }
}

输出：

3.0
4.0
5.0
6.0
7.0

示例 3：

// Java code for DoubleStream asDoubleStream()
// to return a DoubleStream consisting of
// the elements of this stream
import java.util.*;
import java.util.stream.IntStream;
import java.util.stream.DoubleStream;
  
class GFG {
  
    // Driver code
    public static void main(String[] args)
    {
        // Creating an IntStream and using asDoubleStream()
        // to display the elements of IntStream and
        // DoubleStream together
        DoubleStream stream = IntStream.range(3, 8)
                                  .peek(System.out::println)
                                  .asDoubleStream();
  
        // Displaying DoubleStream consisting of
        // the elements of this stream
        stream.forEach(System.out::println);
    }
}

输出：