Java中的 BlockingDeque iterator() 方法及示例

BlockingDeque的iterator()方法以适当的顺序返回此双端队列中元素的迭代器。元素将按从第一个（头）到最后一个（尾）的顺序返回。返回的迭代器是一个“弱一致”的迭代器。

句法：

public Iterator iterator()

参数：此方法不接受任何参数。

返回：此方法以正确的顺序返回此双端队列中元素的迭代器。

注意： BlockingDeque的 iterator() 方法继承自Java中的 LinkedBlockingDeque 类。

下面的程序说明了BlockingDeque的 iterator() 方法：

方案一：

// Java Program Demonstrate iterator()
// method of BlockingDeque
  
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.BlockingDeque;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
  
    {
  
        // create object of BlockingDeque
        BlockingDeque BD
            = new LinkedBlockingDeque();
  
        // Add numbers to front of BlockingDeque
        BD.addFirst(7855642);
        BD.addFirst(35658786);
        BD.addFirst(5278367);
        BD.addFirst(74381793);
  
        // Call iterator() method of BlockingDeque
        Iterator iteratorVals = BD.iterator();
  
        // Print elements of iterator
        // created from PriorityBlockingQueue
        System.out.println("The iterator values"
                           + " of BlockingDeque are:");
  
        // prints the elements using an iterator
        while (iteratorVals.hasNext()) {
            System.out.println(iteratorVals.next());
        }
    }
}

输出：

The iterator values of BlockingDeque are:
74381793
5278367
35658786
7855642

方案二：

// Java Program Demonstrate iterator()
// method of BlockingDeque
// when list is of strings
  
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.BlockingDeque;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
  
    {
  
        // create object of BlockingDeque
        BlockingDeque BD
            = new LinkedBlockingDeque();
  
        // Add numbers to front of BlockingDeque
        BD.add("Geeks");
        BD.add("forGeeks");
        BD.add("A");
        BD.add("Computer");
        BD.add("Portal");
  
        // Call iterator() method of BlockingDeque
        Iterator iteratorVals = BD.iterator();
  
        // Print elements of iterator
        // created from BlockingQueue
        System.out.println("The iterator values"
                           + " of LinkedBlockingDeque are:");
  
        // prints the elements using an iterator
        while (iteratorVals.hasNext()) {
            System.out.println(iteratorVals.next());
        }
    }
}

输出：

The iterator values of BlockingDeque are:
Geeks
forGeeks
A
Computer
Portal

参考： https: Java/util/concurrent/BlockingDeque.html#iterator()