ArrayList Example

package com.listsample;

import java.util.*;

public class ListExample {

public static void main(String args[]) {

// Creating an empty array list

List list = new ArrayList();

// Adding items to arrayList - adding both integer and string values

list.add(2);

list.add(3);

list.add(6);

list.add("DDD");

// Display the contents of the array list

System.out.println("The arraylist contains the following elements: "

+ list);
/*
for (int i = 0; i < list.size(); i++) {

                       //This will throwClassCastingException

Integer iVal = Integer.valueOf(list.get(i).toString());
System.out.println("Index: " + i + " - Item: " + iVal);

}
// hasNext(): returns true if there are more elements
// next(): returns the next element

System.out.println("Retrieving items using iterator");
Iterator itr = list.iterator();

while (itr.hasNext()) {
String str = itr.next().toString();
System.out.println(str);
if (str.equals("AAA"))
itr.remove();
}
*/
// Generics - to restrict the collection object to specific data type

ArrayList<String> list1 = new ArrayList<String>();

list1.add("aaaa");
list1.add("2");

System.out.println("Availabiliy of the element " +list1.contains("bbb"));


ArrayList<String> list2 = new ArrayList<String>();
System.out.println("Before adding theelemets : "+list2.isEmpty());
list2.add("bbbb");
list2.add("aaaa");
list2.add("cccc");
list2.add("2");
list2.add("cccc");

                  //tostring()is to display the elements as string with comma separated values
System.out.println("String list "+list2.toString());

System.out.println("Position of the first occurence of the element "+list2.indexOf("cccc")+" the position of the duplicate "+list2.lastIndexOf("cccc"));

System.out.println("After adding the elements: "+list2.isEmpty());

System.out.println("Comparing the lists: "+list1.containsAll(list2));

Iterator<String> itr1 = list1.iterator();

while (itr1.hasNext()) {
String s = itr1.next();
System.out.println(s);
}

}


}