java.util.PriorityQueue.offer() Method

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Description

The offer(E e) method is used to insert the specified element into this priority queue.

Declaration

Following is the declaration for java.util.PriorityQueue.offer() method.

public boolean offer(E e)

Parameters

e − The element to add.

Return Value

• The method call returns true (as specified by Queue.offer(E))

Exception

• ClassCastException − Throws if the specified element cannot be compared with elements currently in this priority queue according to the priority queue's ordering.

• NullPointerException − Throws if the specified element is null.

Example

The following example shows the usage of java.util.PriorityQueue.offer()

package com.tutorialspoint;

import java.util.*;

public class PriorityQueueDemo {
   public static void main(String args[]) {

      // create priority queue
      PriorityQueue < Integer >  prq = new PriorityQueue < Integer > (); 

      // insert values in the queue
      for ( int i = 0; i  <  10; i++ ) {  
         prq.add (new Integer (i)) ; 
      }

      System.out.println("Initial priority queue values are: "+ prq);

      // add using offer() function call
      prq.offer(122);

      System.out.println("Priority queue values after addition: "+ prq);
   }
}

Let us compile and run the above program, this will produce the following result.

Initial priority queue values are: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Priority queue values after addition: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 122]