Java中的 ConcurrentLinkedDeque iterator() 方法及示例

Java.util.concurrent.ConcurrentLinkedDeque.iterator()方法用于返回与 ConcurrentLinkedDeque 相同元素的迭代器。元素从双端队列中以随机顺序返回。

句法：

Iterator iterate_value = ConcurrentLinkedDeque.iterator();

参数：该函数不带任何参数。

返回值：该方法迭代双端队列的元素并返回值（迭代器）。

下面的程序说明了Java.util.concurrent.ConcurrentLinkedDeque.iterator() 方法的使用：

示例 1：

// Java code to illustrate iterator()
  
import java.util.concurrent.*;
import java.util.*;
  
public class ConcurrentLinkedDequeDemo {
    public static void main(String args[])
    {
        // Creating an empty ConcurrentLinkedDeque
        ConcurrentLinkedDeque deque
            = new ConcurrentLinkedDeque();
  
        // Use add() method to add elements
        // into the ConcurrentLinkedDeque
        deque.add("Welcome");
        deque.add("To");
        deque.add("Geeks");
        deque.add("4");
        deque.add("Geeks");
  
        // Displaying the ConcurrentLinkedDeque
        System.out.println("ConcurrentLinkedDeque: "
                           + deque);
  
        // Creating an iterator
        Iterator value = deque.iterator();
  
        // Displaying the values
        // after iterating through the deque
        System.out.println("The iterator values are: ");
        while (value.hasNext()) {
            System.out.println(value.next());
        }
    }
}

输出：

ConcurrentLinkedDeque: [Welcome, To, Geeks, 4, Geeks]
The iterator values are: 
Welcome
To
Geeks
4
Geeks

示例 2：具有整数元素的 ConcurrentLinkedDeque。

// Java code to illustrate iterator()
  
import java.util.concurrent.*;
import java.util.*;
  
public class ConcurrentLinkedDequeDemo {
    public static void main(String args[])
    {
        // Creating an empty ConcurrentLinkedDeque
        ConcurrentLinkedDeque deque
            = new ConcurrentLinkedDeque();
  
        // Use add() method
        // to add elements into the ConcurrentLinkedDeque
        deque.add(10);
        deque.add(20);
        deque.add(30);
        deque.add(40);
        deque.add(50);
  
        // Displaying the ConcurrentLinkedDeque
        System.out.println("ConcurrentLinkedDeque: "
                           + deque);
  
        // Creating an iterator
        Iterator value = deque.iterator();
  
        // Displaying the values
        // after iterating through the deque
        System.out.println("The iterator values are: ");
        while (value.hasNext()) {
            System.out.println(value.next());
        }
    }
}

输出：

ConcurrentLinkedDeque: [10, 20, 30, 40, 50]
The iterator values are: 
10
20
30
40
50