Java IntStream filter()用法及代碼示例

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並不執行任何過濾，而是創建一個新的流，該新流在遍曆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

相關用法

注：本文由純淨天空篩選整理自Sahil_Bansall大神的英文原創作品 IntStream filter() in Java with examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。