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Add elements at beginning and end of LinkedList Java example

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  1. /*
  2.   Add elements at beginning and end of LinkedList Java example
  3.   This java example shows how to add an element at beginning or at end of
  4.   java LinkedList object using addFirst and addLast methods.
  5. */
  6.  
  7. import java.util.LinkedList;
  8.  
  9. public class AddElementsAtStartEndLinkedListExample {
  10.  
  11.   public static void main(String[] args) {
  12.  
  13.     //create LinkedList object
  14.     LinkedList lList = new LinkedList();
  15.    
  16.     //add elements to LinkedList
  17.     lList.add("1");
  18.     lList.add("2");
  19.     lList.add("3");
  20.     lList.add("4");
  21.     lList.add("5");
  22.    
  23.     System.out.println("LinkedList contains : " + lList);
  24.    
  25.     /*
  26.      * To add an element at the beginning of the LinkedList, use
  27.      * void addFirst(Object obj) method.
  28.      *
  29.      * This method inserts object at the beginning of the LinkedList.
  30.      */
  31.    
  32.      lList.addFirst("0");
  33.      System.out.println("After inserting 0 at beginning, LinkedList contains :"
  34.      + lList);
  35.  
  36.     /*
  37.      * To append an element at end of the LinkedList, use
  38.      * void addLast(Object obj) method.
  39.      *
  40.      * This method append specified element at the end of the LinkedList.
  41.      */    
  42.    
  43.      lList.addLast("6");
  44.     System.out.println("After appending 0 at end, LinkedList contains :" + lList);
  45.  
  46.   }
  47. }
  48.  
  49. /*
  50. Output would be
  51.  
  52. LinkedList contains : [1, 2, 3, 4, 5]
  53. After inserting 0 at beginning, LinkedList contains :[0, 1, 2, 3, 4, 5]
  54. After appending 0 at end, LinkedList contains :[0, 1, 2, 3, 4, 5, 6]
  55. */