Java DoubleStream empty()方法及实例

DoubleStream empty() 是java.util.stream.DoubleStream中的一个方法。该方法返回一个空的连续的DoubleStream。
语法

static DoubleStream empty()

其中，DoubleStream是一个原始双值元素的序列
元素的序列，该函数返回一个空的顺序流。

例1 :

// Java code for DoubleStream empty()
import java.util.*;
import java.util.stream.DoubleStream;
  
class GFG {
  
    // Driver code
    public static void main(String[] args)
    {
        // creating an empty DoubleStream, a sequence of
        // primitive double-valued elements
        DoubleStream stream = DoubleStream.empty();
  
        // Displaying an empty sequential stream
        System.out.println(stream.count());
    }
}

输出:

0

例2 :

// Java code for DoubleStream empty()
import java.util.*;
import java.util.stream.DoubleStream;
  
class GFG {
  
    // Driver code
    public static void main(String[] args)
    {
  
        // creating an empty DoubleStream, a sequence of
        // primitive double-valued elements
        DoubleStream stream = DoubleStream.empty();
  
        // Displaying an empty sequential stream
        System.out.println(Arrays.toString(stream.toArray()));
    }
}

输出:

[]