Java IntStream average()用法及代码示例

Java 8中的java.util.stream.IntStream处理原始int。它有助于解决旧问题，例如以新的方式在数组中找到最大值，在数组中找到最小值，数组中所有元素的总和以及数组中所有值的平均值。 IntStream average()返回一个OptionalDouble，描述此流的元素的算术平均值；如果此流为空，则返回一个空的Optional。
用法:

OptionalDouble average()

Where, OptionalDouble is a container object 
which may or may not contain a double value.

下面给出一些示例，以更好地理解该函数。
示例1:

// Java code for IntStream average() 
import java.util.*; 
import java.util.stream.IntStream; 
  
class GFG { 
  
    // Driver code 
    public static void main(String[] args) 
    { 
  
        // creating a stream 
        IntStream stream = IntStream.of(2, 3, 4, 5, 6, 7, 8); 
  
        // OptionalDouble is a container object 
        // which may or may not contain a 
        // doouble value. 
        OptionalDouble obj = stream.average(); 
  
        // If a value is present, isPresent() will 
        // return true and getAsDouble() will 
        // return the value 
        if (obj.isPresent()) { 
            System.out.println(obj.getAsDouble()); 
        } 
        else { 
            System.out.println("-1"); 
        } 
    } 
}

输出：

5.0

示例2:

// Implementation of IntStream average() 
import java.util.*; 
import java.util.stream.IntStream; 
  
class GFG { 
  
    // Driver code 
    public static void main(String[] args) 
    { 
  
        // creating a stream 
        IntStream stream = IntStream.of(2, 3, 3, 4, 6, 8, 8); 
  
        // OptionalDouble is a container object 
        // which may or may not contain a 
        // doouble value. 
        OptionalDouble obj = stream.average(); 
  
        // If a value is present, isPresent() will 
        // return true and getAsDouble() will 
        // return the value 
        if (obj.isPresent()) { 
            System.out.println(obj.getAsDouble()); 
        } 
        else { 
            System.out.println("-1"); 
        } 
    } 
}

输出：

4.857142857142857

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注：本文由纯净天空筛选整理自Sahil_Bansall大神的英文原创作品 IntStream average() 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。