Java 中的 IntStream 过滤器()，示例
原文:https://www . geesforgeks . org/int stream-filter-Java-examples/
IntStream 筛选器(IntPredicate 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:
IntStream filter(IntPredicate predicate)
Where, IntStream is a sequence of primitive int-valued elements.
IntPredicate represents a predicate (boolean-valued function)
of one int-valued argument and the function returns the new stream.
示例 1 : 在 IntStream 上使用 filter()方法。
// Java code for IntStream filter
// (IntPredicate predicate) to get a stream
// consisting of the elements of this
// stream that match the given predicate.
import java.util.*;
import java.util.stream.IntStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating an IntStream
IntStream stream = IntStream.of(3, 5, 6, 8, 9);
// Using IntStream filter(IntPredicate 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 : 在 IntStream 上使用 filter()方法。
// Java code for IntStream filter
// (IntPredicate predicate) to get a stream
// consisting of the elements of this
// stream that match the given predicate.
import java.util.*;
import java.util.stream.IntStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating an IntStream
IntStream stream = IntStream.of(-2, -1, 0, 1, 2);
// Using IntStream filter(IntPredicate 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
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