Example code for simple ArrayList

// simple arraylist Application
package collection;

import java.util.*;

class SampleArrayList
{
 public static void main(String[] args)
 {

     ArrayList a1=new ArrayList();
 
         a1.add(new Integer(10));
         a1.add("hello");
         a1.add(new Integer(20));
         a1.add(new Integer(30));

     System.out.println(a1);  // here ArryList toString method called

     // By using  iterator
 
     Iterator i1=a1.iterator();

     while(i1.hasNext())
             System.out.println(i1.next());
          

         }
}


output:
[10, hello, 20, 30]
10
hello
20
30