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Iterate through a Collection using Java Iterator Example

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  1. /*
  2.   Iterate through a Collection using Java Iterator Example
  3.   This Java Example shows how to iterate through a Collection using Java Iterator.
  4. */
  5.  
  6. import java.util.Iterator;
  7. import java.util.ArrayList;
  8.  
  9. public class JavaIteratorExample {
  10.  
  11.   public static void main(String[] args) {
  12.  
  13.     //create an ArrayList object
  14.     ArrayList aList = new ArrayList();
  15.    
  16.     //populate ArrayList object
  17.     aList.add("1");
  18.     aList.add("2");
  19.     aList.add("3");
  20.     aList.add("4");
  21.     aList.add("5");
  22.    
  23.     /*
  24.       Get Iterator object by invoking iterator method of collection.
  25.       Iterator provides hasNext() method which returns true if has more
  26.       elements. next() method returns the element in iteration.
  27.     */
  28.     Iterator itr = aList.iterator();
  29.  
  30.     //iterate through the ArrayList values using Iterator's hasNext and next methods
  31.     while(itr.hasNext())
  32.       System.out.println(itr.next());
  33.    
  34.     /*
  35.       Please note that next method may throw a java.util.NoSuchElementException
  36.       if iteration has no more elements.
  37.     */
  38.    
  39.  
  40.   }
  41. }
  42.  
  43. /*
  44. Output would be
  45. 1
  46. 2
  47. 3
  48. 4
  49. 5
  50. */