Exploring the Collections Methods

Collections

import java.awt.List;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.PriorityQueue;
import java.util.Queue;
import java.util.Scanner;


public class Collections {

	public static void main(String[] args) {
		// TODO Auto-generated method stubAR
		//Creating New Array List
		Scanner in=new Scanner(System.in);
		System.out.println("************ ARRAY LIST ************");
		ArrayList arrayList=new ArrayList();
		//Check arrayList
	    System.out.println("Is Array List Empty :"+arrayList.isEmpty());
	    System.out.println("Is Array List Size :"+arrayList.size());
	    System.out.println("-----------------------------------------------------");
		System.out.println("Adding Elements");
	    System.out.println("-----------------------------------------------------");

		//add Elements
		for(int i=0;i<5;i++){
		System.out.println("Add element :"+i);
		arrayList.add(i);
		}
	    System.out.println("-----------------------------------------------------");

		//Check arrayList
		System.out.println("Is Array List  Empty :"+arrayList.isEmpty());
	    System.out.println("-----------------------------------------------------");

		System.out.println("Ttraverse Through Array List by for each");
		//Display Array List Elements by for each
		for(Object data:arrayList){
			System.out.println(data);
		}
	    System.out.println("-----------------------------------------------------");
		//Display Elements by Iterator
		Iterator itr = arrayList.iterator();
		System.out.println("Ttraverse Through ArraytList by Iterator");
	      while(itr.hasNext()) {
	         Object element = itr.next();
	         System.out.println(element+" ");
	      }
		    System.out.println("-----------------------------------------------------");

		//Remove element at 3
		    System.out.println("Remove element at index 3");
		    arrayList.remove(3);
		    System.out.println("-----------------------------------------------------");
		    System.out.println("ArrayList After Removal of Element at 3");
		    for(Object data:arrayList){
				System.out.println(data);
			}
		    System.out.println("-----------------------------------------------------");
		    System.out.println("Clone ArrayList as ArrayList2");

		    ArrayList  arrayList2=(ArrayList) arrayList.clone();
	      //Display Array List Elements by for each
	 		for(Object data:arrayList2){
	 			System.out.println(data);
	 		}
	 		System.out.println("-----------------------------------------------------");
		    System.out.println("Comparing ArrayList with ArrayList2:"+arrayList.equals(arrayList2));
		    System.out.println("-----------------------------------------------------");
		    System.out.println("Clear Arraylist2");
		    arrayList2.clear();
		    System.out.println("-----------------------------------------------------");
		    System.out.println("Comparing ArrayList with ArrayList2:"+arrayList.equals(arrayList2));
		    System.out.println("-----------------------------------------------------");
		    System.out.println("");
		    System.out.println("************ Queue ************");
		    System.out.println("");
		    PriorityQueue priorityQueue=new PriorityQueue();
		    
		  //Check priorityQueue
		    System.out.println("Is priorityQueue Empty :"+priorityQueue.isEmpty());
		    System.out.println("Is priorityQueue Size :"+priorityQueue.size());
		    System.out.println("-----------------------------------------------------");
			System.out.println("Adding Elements by add()");
		    System.out.println("-----------------------------------------------------");

			//add Elements
			for(int i=0;i<=5;i++){
			System.out.println("Add element :"+i);
			priorityQueue.add(i);
			}
			System.out.println("-----------------------------------------------------");
			System.out.println("Adding Elements by offer()");
		    System.out.println("-----------------------------------------------------");

			//add Elements
			for(int i=6;i<=10;i++){
			System.out.println("Add element :"+i);
			priorityQueue.offer(i);
			}
		    System.out.println("-----------------------------------------------------");

			//Check priorityQueue
			System.out.println("Is priorityQueue  Empty :"+priorityQueue.isEmpty());
		    System.out.println("-----------------------------------------------------");

			System.out.println("Ttraverse Through priorityQueue by for each");
			//Display priorityQueue Elements by for each
			for(Object data:priorityQueue){
				System.out.println(data);
			}
		    System.out.println("-----------------------------------------------------");
			//Display Elements by Iterator
			Iterator itr2 = priorityQueue.iterator();
			System.out.println("Ttraverse Through priorityQueue by Iterator");
		      while(itr2.hasNext()) {
		         Object element = itr2.next();
		         System.out.println(element+" ");
		      }
			    System.out.println("-----------------------------------------------------");
			    System.out.println("priorityQueue Element() :"+priorityQueue.element());
			    System.out.println("-----------------------------------------------------");
			    System.out.println("priorityQueue Peek() :"+priorityQueue.peek());
			    System.out.println("-----------------------------------------------------");
			    
			//Remove element at 3
			    System.out.println("Remove element at index 3 by remove(3)");
			    priorityQueue.remove(3);
			    System.out.println("-----------------------------------------------------");
			    System.out.println("priorityQueue After Removal of Element at 3");
			    for(Object data:priorityQueue){
					System.out.println(data);
				}
			    System.out.println("-----------------------------------------------------");
			    System.out.println("Remove element at  poll()");
			    priorityQueue.poll();
			    System.out.println("-----------------------------------------------------");
			    System.out.println("priorityQueue After Removal of Element by poll()");
			    for(Object data:priorityQueue){
					System.out.println(data);
				}
			    System.out.println("-----------------------------------------------------");
			    System.out.println("");
			    System.out.println("************ Sets ************");
			    System.out.println("");
			  //Creating HashSet   
			    HashSet<String> set=new HashSet<String>();
			  //Check Set
			    System.out.println("Is set Empty :"+set.isEmpty());
			    System.out.println("Is set Size :"+set.size());
			    System.out.println("-----------------------------------------------------");
				System.out.println("Adding Elements");
			    System.out.println("-----------------------------------------------------");

				//add Elements
				set.add("Balamurugan");
				set.add("Priyanka");
				set.add("Rajeshkumar");
				set.add("Saleem");
				set.add("Kumaresan");
				set.add("Vinothini");
				//Check Set
				System.out.println("Is set  Empty :"+set.isEmpty());
			    System.out.println("-----------------------------------------------------");

				System.out.println("Ttraverse Through Set by for each");
				//Display Set Elements by for each
				for(Object data:set){
					System.out.println(data);
				}
			    System.out.println("-----------------------------------------------------");
				//Display Elements by Iterator
				Iterator itr3 = set.iterator();
				System.out.println("Ttraverse Through Set by Iterator");
			      while(itr3.hasNext()) {
			         Object element = itr3.next();
			         System.out.println(element+" ");
			      }
				    System.out.println("-----------------------------------------------------");

	
	}

}