Queue in Java | Queue in Collection Framework in Java | Queue Data Structure in Java Example

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Program Code: (QueueProg.java) 

import java.util.*; public class QueueProg {       public static void main(String args[]) {       Queue q = new LinkedList();       int head;       System.out.println("Queue: " + q);       q.add(10);  //offer()       System.out.println("Queue: " + q);       q.add(25);       System.out.println("Queue: " + q);       q.add(22);       System.out.println("Queue: " + q);       q.add(18);       try {       System.out.println("Queue: " + q);       head=(int)q.remove();  //poll()       System.out.println("Queue: " + q);       head=(int)q.remove();       System.out.println("Queue: " + q);       head=(int)q.remove();       System.out.println("Queue: " + q);       head=(int)q.remove();        System.out.println("Queue: " + q);       head=(int)q.remove();       }       catch(Exception e) {          System.out.println("Queue is Empty");      }                         } }

  

Output:

parag@parag-Inspiron-N4010:~/Desktop/prog$ javac QueueProg.java  Note: QueueProg.java uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. parag@parag-Inspiron-N4010:~/Desktop/prog$ java QueueProg Queue: [] Queue: [10] Queue: [10, 25] Queue: [10, 25, 22] Queue: [10, 25, 22, 18] Queue: [25, 22, 18] Queue: [22, 18] Queue: [18] Queue: [] Queue is Empty