PriorityQueue offer() Method in Java
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:
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.
Below programs illustrate the java.util.PriorityQueue.offer() method
Program 1:
// 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:
Initial PriorityQueue: [4, Geeks, To, Welcome, Geeks] Priority queue after Insertion: [4, Class, Priority, Geeks, Geeks, To, The, Welcome]
Program 2:
// 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]
