Java LongStream count()用法及代码示例

长流count()返回流中元素的数量。 LongStream count()存在于java.util.stream.LongStream中
用法:

long count()

示例1:计算LongStream中的元素。

// Java code for LongStream count() 
// to count the number of elements in 
// given stream 
import java.util.*; 
import java.util.stream.LongStream; 
  
class GFG { 
  
    // Driver code 
    public static void main(String[] args) 
    { 
        // creating a stream 
        LongStream stream = LongStream.of(2L, 3L, 4L, 5L, 
                                          6L, 7L, 8L); 
  
        // storing the count of elements 
        // in a variable named total 
        long total = stream.count(); 
  
        // displaying the total number of elements 
        System.out.println(total); 
    } 
}

输出：

示例2:计算给定范围内的元素。

// Java code for LongStream count() 
// to count the number of elements in 
// given range excluding the last element 
import java.util.*; 
import java.util.stream.LongStream; 
  
class GFG { 
  
    // Driver code 
    public static void main(String[] args) 
    { 
        // creating a stream 
        LongStream stream = LongStream.range(2, 50); 
  
        // storing the count of elements 
        // in a variable named total 
        long total = stream.count(); 
  
        // displaying the total number of elements 
        System.out.println(total); 
    } 
}

输出：

示例3:计算LongStream中的不同元素。

// Java code for LongStream count() 
// to count the number of distinct 
// elements in given stream 
import java.util.*; 
import java.util.stream.LongStream; 
  
class GFG { 
  
    // Driver code 
    public static void main(String[] args) 
    { 
        // creating a stream 
        LongStream stream = LongStream.of(2L, 3L, 4L, 4L, 
                                          7L, 7L, 8L); 
  
        // storing the count of distinct elements 
        // in a variable named total 
        long total = stream.distinct().count(); 
  
        // displaying the total number of elements 
        System.out.println(total); 
    } 
}

输出：

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 LongStream count() 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。