Java PriorityBlockingQueue iterator()方法

PriorityBlockingQueue 类的 iterator() 方法在这个队列中返回一个元素的迭代器。从这个方法返回的元素不遵循任何顺序。返回的迭代器是弱一致性的。

语法

public Iterator iterator()

参数： 该方法不接受任何参数。

返回： 该方法返回一个 迭代器 ，其元素与PriorityBlockingQueue中的元素相同。

下面的程序说明了PriorityBlockingQueue的iterator()方法。

例1 :

// Java Program Demonstrate iterator()
// method of PriorityBlockingQueue
  
import java.util.concurrent.PriorityBlockingQueue;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // define capacity of PriorityBlockingQueue
        int capacityOfQueue = 5;
  
        // create object of PriorityBlockingQueue
        PriorityBlockingQueue<Integer> PrioQueue
            = new PriorityBlockingQueue<Integer>(capacityOfQueue);
  
        // Add elements to PriorityBlockingQueue
        PrioQueue.add(945645);
        PrioQueue.add(6468516);
        PrioQueue.add(7564165);
        PrioQueue.add(45616);
  
        // print PrioQueue
        System.out.println("PrioQueue: " + PrioQueue);
  
        // Call iterator() method of PriorityBlockingQueue
        Iterator iteratorVals = PrioQueue.iterator();
  
        // Print elements of iterator
        // created from PriorityBlockingQueue
        System.out.println("The iterator values"
                           + " of PriorityBlockingQueue are:");
  
        while (iteratorVals.hasNext()) {
            System.out.println(iteratorVals.next());
        }
    }
}

输出:

PrioQueue: [45616, 945645, 7564165, 6468516]
The iterator values of PriorityBlockingQueue are:
45616
945645
7564165
6468516

例2： 说明PriorityBlockingQueue的iterator()方法，该方法包含名字的列表。

// Java Program Demonstrate iterator()
// method of PriorityBlockingQueue
  
import java.util.concurrent.PriorityBlockingQueue;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // define capacity of PriorityBlockingQueue
        int capacityOfQueue = 5;
  
        // create object of PriorityBlockingQueue
        PriorityBlockingQueue<String> names
            = new PriorityBlockingQueue<String>(capacityOfQueue);
  
        // Add names of students of girls college
        names.add("Geeks");
        names.add("forGeeks");
        names.add("A");
        names.add("Computer");
        names.add("Portal");
  
        // Call iterator() method of PriorityBlockingQueue
        Iterator iteratorVals = names.iterator();
  
        // Print elements of iterator
        // created from PriorityBlockingQueue
        System.out.println("The Names are:");
  
        while (iteratorVals.hasNext()) {
            System.out.println(iteratorVals.next());
        }
    }
}

输出:

The Names are:
A
Computer
Geeks
forGeeks
Portal

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