Java LongStream filter()用法及代码示例

LongStream filter(LongPredicate predicate)返回包含与给定谓词匹配的该流元素的流。这是一个中间操作。这些操作总是很懒惰，即执行诸如filter()之类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，该新流在遍历时将包含与给定谓词匹配的初始流的元素。

用法:

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.

示例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

示例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

相关用法

注：本文由纯净天空筛选整理自Sahil_Bansall大神的英文原创作品 LongStream filter() in Java with examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。