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Java Collections - PriorityQueue.element() Examples

Java Collections Java Java API 


Class:

java.util.PriorityQueue

java.lang.Objectjava.lang.Objectjava.util.AbstractCollectionjava.util.AbstractCollectionjava.util.CollectionCollectionjava.util.AbstractQueuejava.util.AbstractQueuejava.util.QueueQueuejava.util.PriorityQueuejava.util.PriorityQueuejava.io.SerializableSerializableLogicBig

Method:

public E element()

Retrieves, but does not remove, the head of this queue. This method differs from PriorityQueue#peek() only in that it throws an exception if this queue is empty.


Examples


package com.logicbig.example.priorityqueue;

import java.util.PriorityQueue;

public class ElementExample {

public static void main(String... args) {
PriorityQueue<String> pq = new PriorityQueue<>();
pq.add("c");
pq.add("a");
pq.add("b");
System.out.println(pq);
String element = pq.element();
System.out.println(element);
element = pq.element();
System.out.println(element);
}
}

Output

[a, c, b]
a
a




package com.logicbig.example.priorityqueue;

import java.util.PriorityQueue;

public class ElementExample2 {

public static void main(String... args) {
PriorityQueue<String> pq = new PriorityQueue<>();
pq.element();
}
}

Output

Caused by: java.util.NoSuchElementException
at java.base/java.util.AbstractQueue.element(AbstractQueue.java:136)
at com.logicbig.example.priorityqueue.ElementExample2.main(ElementExample2.java:14)
... 6 more




See Also