Monday 14 April 2014

java.util.ArrayList Implementation # 2



/*
     ArrayList implementation
     Creating ArrayList of integers
*/
/*
     ArrayList class implements the List interface
     The List interface extends the Collection Interface
*/

import java.util.*;

class Main
{
     public static void main(String args[])
     {
           ArrayList a=new ArrayList();
          
           a.add(new Integer(10));
           a.add(new Integer(18));
           a.add(new Integer(48));
           a.add(new Integer(13));
           a.add(new Integer(56));
           a.add(new Integer(89));
    
           System.out.println();
           System.out.println("The contents of Collection - a are :\n"+a);
           System.out.println();
          
           a.remove(new Integer(18)); // from the Collection Interface
           System.out.println("The contents of Collection - a after deleting \"18\" are :\n"+a);
           System.out.println();
          
           a.remove(3); // from the List Interface
           System.out.println("The contents of Collection - a after deleting 3rd index are :\n"+a);

           System.out.println();
           System.out.println("the size of your collection a is : "+a.size());
          
          
           /* now here finding the sum of all the elements of ArrayList*/
          
           Object arr[]=a.toArray();
           int sum=0;
           for(Object i:arr)
                sum+=(((Integer)i).intValue());
           System.out.println();
           System.out.println("The sum of all the elements of your ArrayList is : "+sum);

     }
}

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