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Add an element to specified index of Java ArrayList Example

  1. /*
  2.   Add an element to specified index of Java ArrayList Example
  3.   This Java Example shows how to add an element at specified index of java
  4.   ArrayList object using add method.
  5. */
  6.  
  7. import java.util.ArrayList;
  8.  
  9. public class AddElementToSpecifiedIndexArrayListExample {
  10.  
  11.   public static void main(String[] args) {
  12.     //create an ArrayList object
  13.     ArrayList arrayList = new ArrayList();
  14.    
  15.     //Add elements to Arraylist
  16.     arrayList.add("1");
  17.     arrayList.add("2");
  18.     arrayList.add("3");
  19.    
  20.     /*
  21.       To add an element at the specified index of ArrayList use
  22.       void add(int index, Object obj) method.
  23.       This method inserts the specified element at the specified index in the
  24.       ArrayList.  
  25.     */
  26.     arrayList.add(1,"INSERTED ELEMENT");
  27.    
  28.     /*
  29.       Please note that add method DOES NOT overwrites the element previously
  30.       at the specified index in the list. It shifts the elements to right side
  31.       and increasing the list size by 1.
  32.     */
  33.  
  34.     System.out.println("ArrayList contains...");
  35.     //display elements of ArrayList
  36.     for(int index=0; index < arrayList.size(); index++)
  37.       System.out.println(arrayList.get(index));
  38.    
  39.   }
  40. }
  41.  
  42. /*
  43. Output would be
  44. ArrayList contains...
  45. 1
  46. INSERTED ELEMENT
  47. 2
  48. 3
  49. */