Java 中的 LongStream 过滤器()，示例
原文:https://www . geesforgeks . org/longstream-filter-Java-examples/
LongStream filter(long 谓词谓词)返回一个由该流中与给定谓词匹配的元素组成的流。这是一个 的中级操作。 这些操作总是懒惰的，即执行诸如 filter()的中间操作实际上并不执行任何过滤，而是创建一个新的流，当遍历该流时，它包含与给定谓词匹配的初始流的元素。
语法:
LongStream filter(LongPredicate predicate)
Where, LongStream is a sequence of primitive long-valued elements.
LongPredicate represents a predicate (boolean-valued function)
of one long-valued argument and the function returns the new stream.
例 1:LongStream 上的 filter()方法。
// Java code for LongStream filter
// (LongPredicate predicate) to get a stream
// consisting of the elements of this
// stream that match the given predicate.
import java.util.*;
import java.util.stream.LongStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating an LongStream
LongStream stream = LongStream.of(3L, 5L, 6L, 8L, 9L);
// Using LongStream filter(LongPredicate predicate)
// to get a stream consisting of the
// elements that gives remainder 2 when
// divided by 3
stream.filter(num -> num % 3 == 2)
.forEach(System.out::println);
}
}
输出:
5
8
例 2:LongStream 上的 filter()方法。
// Java code for LongStream filter
// (LongPredicate predicate) to get a stream
// consisting of the elements of this
// stream that match the given predicate.
import java.util.*;
import java.util.stream.LongStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating an LongStream
LongStream stream = LongStream.of(-2L, -1L, 0L, 1L, 2L);
// Using LongStream filter(LongPredicate predicate)
// to get a stream consisting of the
// elements that are greater than 0
stream.filter(num -> num > 0)
.forEach(System.out::println);
}
}
输出:
1
2
版权属于：月萌API www.moonapi.com，转载请注明出处
