IntStream filter(IntPredicate predicate)返回一個由與給定謂詞匹配的流元素組成的流。這是一個中間操作。這些操作總是很懶惰，即執行諸如filter()之類的中間操作實際上并不執行任何過濾，而是創建一個新的流，該新流在遍歷時將包含與給定謂詞匹配的初始流的元素。

用法:

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:IntStream上的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);

}

}

輸出：

5

8

示例2:IntStream上的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);

}

}

輸出：

1

2

總結

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