Java IntStream count()用法及代碼示例

IntStream count()返回流中元素的數量。 java.util.stream.IntStream中存在IntStream count()
用法:

long count()

示例1:計算IntStream中的元素。

// Java code for IntStream count() 
// to count the number of elements in 
// given stream 
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); 
  
        // storing the count of elements 
        // in a variable named total 
        long total = stream.count(); 
  
        // displaying the total number of elements 
        System.out.println(total); 
    } 
}

輸出：

示例2:計算給定範圍內的元素。

// Java code for IntStream count() 
// to count the number of elements in 
// given range excluding the last element 
import java.util.*; 
import java.util.stream.IntStream; 
  
class GFG { 
  
    // Driver code 
    public static void main(String[] args) 
    { 
  
        // creating a stream 
        IntStream stream = IntStream.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); 
    } 
}

輸出：

示例3:計算IntStream中的不同元素。

// Java code for IntStream count() 
// to count the number of distinct 
// elements in given stream 
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, 4, 7, 7, 8); 
  
        // 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); 
    } 
}

輸出：

相關用法

注：本文由純淨天空篩選整理自Sahil_Bansall大神的英文原創作品 IntStream count() in Java with examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。