Java中的ArrayBlockingQueue spliterator()方法

ArrayBlockingQueue 的 spliterator() 方法在ArrayBlockingQueue的元素上返回一个Spliterator。返回的迭代器是弱一致性的。Spliterator可以在Java 8中与Streams一起使用。Spliterator也可以单独或批量地遍历元素。

语法

public Spliterator spliterator()

返回值： 该方法返回ArrayBlockingQueue中元素的Spliterator。

下面的程序说明了ArrayBlockingQueue类的splitator()方法：

程序1 :

// Java Program Demonstrate spliterator()
// method of ArrayBlockingQueue
 
import java.util.concurrent.ArrayBlockingQueue;
import java.util.*;
public class GFG {
 
    public static void main(String[] args)
    {
        // define capacity of ArrayBlockingQueue
        int capacityOfQueue = 7;
 
        // create object of ArrayBlockingQueue
        ArrayBlockingQueue<Integer> Queue
            = new ArrayBlockingQueue<Integer>(capacityOfQueue);
 
        // Add element to ArrayBlockingQueue
        Queue.add(22);
        Queue.add(34);
        Queue.add(45);
        Queue.add(67);
 
        // create Spliterator of Queue
        // using spliterator() method
        Spliterator<Integer> numbers = Queue.spliterator();
 
        // getExactSize of Spliterator
        System.out.println("Size of Spliterator : "
                           + numbers.estimateSize());
 
        System.out.println("list of Numbers:");
        // forEachRemaining method of Spliterator
        numbers.forEachRemaining((n) -> System.out.println(n));
    }
}

输出

Size of Spliterator : 4
list of Numbers:
22
34
45
67

示例 2:

// Java Program Demonstrate spliterator()
// method of ArrayBlockingQueue
 
import java.util.concurrent.ArrayBlockingQueue;
import java.util.*;
public class GFG {
 
    public static void main(String[] args)
    {
        // define capacity of ArrayBlockingQueue
        int capacityOfQueue = 7;
 
        // create object of ArrayBlockingQueue
        ArrayBlockingQueue<String> QueueOfStrings
            = new ArrayBlockingQueue<String>(capacityOfQueue);
 
        // Add element to ArrayBlockingQueue
        QueueOfStrings.add("India");
        QueueOfStrings.add("Pakistan");
        QueueOfStrings.add("England");
        QueueOfStrings.add("China");
        QueueOfStrings.add("UAE");
        QueueOfStrings.add("Spain");
 
        // create Spliterator of QueueOfStrings
        // using spliterator() method
        Spliterator<String>
            listOfStrings = QueueOfStrings.spliterator();
 
        // getExactSize of Spliterator
        System.out.println("Size of Spliterator : "
                           + listOfStrings.estimateSize());
 
        System.out.println("list of Country names:");
 
        // forEachRemaining method of Spliterator
        listOfStrings.forEachRemaining((str) -> print(str));
    }
    public static void print(String str)
    {
        System.out.println("Value = " + str);
    }
}

输出

Size of Spliterator : 6
list of Country names:
Value = India
Value = Pakistan
Value = England
Value = China
Value = UAE
Value = Spain

参考资料: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ArrayBlockingQueue.html#spliterator-