Java IntStream count()示例

IntStream count() 返回流中元素的数量。IntStream count()存在于java.util.stream.IntStream
语法中。

long count()

例1： 计算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);
    }
}

输出:

7

例2： 计算一个给定范围内的元素。

// 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);
    }
}

输出:

48

例3： 计算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);
    }
}

输出:

5