Java 中的 IntStream count()，示例
原文:https://www . geesforgeks . org/int stream-count-in-Java-with-examples/
IntStream count() 返回流中元素的计数。IntStream count()在 java.util.stream.IntStream 中存在 T3】语法:
long count()
例 1 : 统计 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 : 统计给定范围内的元素。
// 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
示例 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
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