Java BlockingDeque iterator()方法及示例
BlockingDeque 的 iterator() 方法以适当的顺序返回该deque中的元素的迭代器。这些元素将按照从第一个(头)到最后一个(尾)的顺序返回。返回的迭代器是一个 “弱一致性 “迭代器。
语法
public Iterator iterator()
参数: 该方法不接受任何参数。
返回: 该方法以适当的顺序返回该deque中的元素的一个迭代器。
注意 : BlockingDeque 的iterator()方法是继承自Java中的LinkedBlockingDeque类。
下面的程序说明了BlockingDeque的iterator()方法。
程序1 :
// 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<Integer> BD
= new LinkedBlockingDeque<Integer>();
// 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
程序2 :
// 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<String> BD
= new LinkedBlockingDeque<String>();
// 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
**参考资料: **https: //docs.oracle.com/javase/7/docs/api/java/util/concurrent/BlockingDeque.html#iterator()