Collection API

CollectionAPI:

The Java Collections API's provide Java developers with a set of classes and interfaces that makes it easier to handle collections of objects. In a sense Collection's works a bit like arrays, except their size can change dynamically, and they have more advanced behaviour than arrays.


Example program:
 
import java.util.ArrayList;
import java.util.Hashtable;


public class CollectionAPI {

 /**
  * @param args
  */
 public static void main(String[] args) {

  int names[] = new int[5];
  
  ArrayList list = new ArrayList();
  list.add("Ramu");//0
  list.add("Venu");//1
  list.add("Raju");//2
    
  System.out.println(list.size());
  
  for(int i =0; i<=list.size(); i++)
               {
   System.out.println(list.get(i));
  }
  
  // key - value
  // key - unique
  Hashtable table = new Hashtable();
  table.put("name", "Hyderabad");
  table.put("place", "Mumbai");
  table.put("name", "Chenni");
  
  System.out.println(table.get("name"));
  
  
  
 }

}