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 streamimport 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 elementimport 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 streamimport 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