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Remove first and last elements of LinkedList Java example

  1. /*
  2.   Remove first and last elements of LinkedList Java example
  3.   This java example shows how to remove first and last elements of Java LinkedList
  4.   object using removeFirst and removeLast methods.
  5. */
  6.  
  7. import java.util.LinkedList;
  8.  
  9. public class RemoveFirstLastElementsLinkedListExample {
  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 remove first element of Java LinkedList, use
  27.      * Object removeFirst() method.
  28.      *
  29.      * This method removes first element of LinkedList and shifts the subsequent
  30.      * elements to the left. It returns the element previously at the first index
  31.      * of the LinkedList.
  32.      */
  33.    
  34.      Object object = lList.removeFirst();
  35.      System.out.println(object + " has been removed from the first index
  36.                                                            of LinkedList");
  37.      System.out.println("LinkedList now contains : " + lList);
  38.    
  39.      /*
  40.       * To remove last element of Java LinkedList, use
  41.       * Object removeLast() method.
  42.       *
  43.       * This method removes last element of LinkedList. It returns the element
  44.       * previously at the last index of the LinkedList.
  45.       */
  46.      
  47.       object = lList.removeLast();
  48.       System.out.println(object + " has been removed from the last index
  49.                                                            of LinkedList");
  50.       System.out.println("LinkedList now contains : " + lList);
  51.  
  52.   }
  53. }
  54.  
  55. /*
  56. Output would be
  57.  
  58. LinkedList contains : [1, 2, 3, 4, 5]
  59. 1 has been removed from the first index of LinkedList
  60. LinkedList now contains : [2, 3, 4, 5]
  61. 5 has been removed from the last index of LinkedList
  62. LinkedList now contains : [2, 3, 4]
  63. */