Using Lists in Java

JavaLists.java

package com.diycomputerscience;

import java.util.List;
import java.util.ArrayList;
import java.util.ListIterator;

/**
 * This class explains the usage of Lists in Java
 */
public class JavaLists {

  public static void main(String args[]) {
    List<String> list = createArrayList();
    accessElement(list);
    removeElement(list);
  }

  private static List<String> createArrayList() {
    // Create an ArrayList which can contain Strings and populate it
    List<String> list = new ArrayList<String>();
    list.add("Aamras");
    list.add("Frooti");
    list.add("Pepsi");
    // Notice that this method returns a list and not an ArrayList. This allows
    // us to change the list implementation and return another List type such as
    // LinkedList if we so choose
    return list;
  }

  private static void accessElement(List<String> list) {
    // Access an element at a particular location
    System.out.println("The 2nd element of the list is: " + list.get(1));
    // Print all elements of the list
    System.out.println("Printing all elements of the list");
    for (String element : list) {
      System.out.println(element);
    }
  }

  private static void removeElement(List<String> list) {
    //Let's remove the 3rd element from the list using the element's index
    list.remove(2);
    System.out.println("Removed 'Pepsi' from the list. New list contents: ");
    System.out.println(list);
    
    //Let's remove an element using the ListIterator interface
    ListIterator<String> listIter = list.listIterator();
    while(listIter.hasNext()) {
      String element = listIter.next();
      if(element.equals("Frooti")) {
        System.out.println("Removed 'Frooti' from the list. New list contents: ");
        listIter.remove();
      }
    }
    System.out.println(list);
  }
}