PriorityQueue offer() Method in Java
Last Updated :
10 Dec, 2018
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The java.util.PriorityQueue.offer() method is used to insert a particular element into the Priority Queue. It acts similar to the add() method of Priority Queue.
Syntax:
Java
Java
Priority_Queue.offer(Object element)Parameters: The parameter element is of the type PriorityQueue and refers to the element to be inserted into the Queue. Return Value: The method returns True if the value is successfully inserted into the queue. Exceptions: The method can throw two types of exceptions:
- NullPointerException: If the element to be inserted is NULL.
- ClassCastException: If an element to be inserted is of a different type that cannot be compared to the existing elements of the Queue.
// Java code to illustrate offer()
import java.util.*;
public class PriorityQueueDemo {
public static void main(String args[])
{
// Creating an empty PriorityQueue
PriorityQueue<String> queue = new PriorityQueue<String>();
// Use add() method to add elements into the Queue
queue.add("Welcome");
queue.add("To");
queue.add("Geeks");
queue.add("4");
queue.add("Geeks");
// Displaying the PriorityQueue
System.out.println("Initial PriorityQueue: " + queue);
// Inserting using offer()
queue.offer("The");
queue.offer("Priority");
queue.offer("Class");
// Displaying th final Queue
System.out.println("Priority queue after Insertion: " + queue);
}
}
Output:
Program 2:
Initial PriorityQueue: [4, Geeks, To, Welcome, Geeks] Priority queue after Insertion: [4, Class, Priority, Geeks, Geeks, To, The, Welcome]
// Java code to illustrate offer()
import java.util.*;
public class PriorityQueueDemo {
public static void main(String args[])
{
// Creating an empty PriorityQueue
PriorityQueue<Integer> queue = new PriorityQueue<Integer>();
// Use add() method to add elements into the Queue
queue.add(10);
queue.add(15);
queue.add(30);
queue.add(20);
queue.add(5);
// Displaying the PriorityQueue
System.out.println("Initial PriorityQueue: " + queue);
// Inserting using offer()
queue.offer(100);
queue.offer(120);
queue.offer(150);
// Displaying th final Queue
System.out.println("Priority queue after Insertion: " + queue);
}
}
Output:
Initial PriorityQueue: [5, 10, 30, 20, 15] Priority queue after Insertion: [5, 10, 30, 20, 15, 100, 120, 150]
