Java 中的 PriorityBlockingQueue 迭代器()方法
原文:https://www . geeksforgeeks . org/priorityblockingqueue-iterator-method-in-Java/
PriorityBlockingQueue类的迭代器()方法返回该队列中元素的迭代器。从该方法返回的元素不遵循任何顺序。返回的迭代器弱一致。
语法:
public Iterator iterator()
参数:该方法不取任何参数。
返回:该方法返回一个迭代器，其元素与优先级阻塞队列中的元素相同。
下面的程序说明了 PriorityBlockingQueue 的迭代器()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());
}
}
}
Output:
PrioQueue: [45616, 945645, 7564165, 6468516]
The iterator values of PriorityBlockingQueue are:
45616
945645
7564165
6468516
例 2: 说明包含名称列表的 PriorityBlockingQueue 的迭代器()方法。
// 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());
}
}
}
Output:
The Names are:
A
Computer
Geeks
forGeeks
Portal
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