Java 中的 LongStream peek()，带示例
原文:https://www . geesforgeks . org/longstream-peek-Java-examples/
LongStream peek() 是 java.util.stream.LongStream 中的一个方法，该函数返回一个由这个流的元素组成的流，当从结果流中消费元素时，还会对每个元素执行提供的操作。
语法:
LongStream peek(LongConsumer action)
Where, LongStream is a sequence of primitive
long-valued elements and the function returns
a parallel LongStream and LongConsumer represents
an operation that accepts a single long-valued argument.
示例 1 : 对给定范围的流执行求和。
// Java code for LongStream peek()
// where the action performed is to get
// sum of all elements in given range
import java.util.*;
import java.util.stream.LongStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating a stream of longs
LongStream stream = LongStream.range(2L, 10L);
// performing action sum on elements of
// given range and storing the result in sum
long sum = stream.peek(System.out::println).sum();
// Displaying the result of action performed
System.out.println("sum is : " + sum);
}
}
输出:
2
3
4
5
6
7
8
9
sum is : 44
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