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Shuffle elements of Java ArrayList example

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  1. /*
  2.   Shuffle elements of Java ArrayList example
  3.   This java example shows how to shuffle elements of Java ArrayList object using
  4.   shuffle method of Collections class.
  5. */
  6.  
  7. import java.util.ArrayList;
  8. import java.util.Collections;
  9.  
  10. public class ShuffleElementsOfArrayListExample {
  11.  
  12.   public static void main(String[] args) {
  13.    
  14.     //create an ArrayList object
  15.     ArrayList arrayList = new ArrayList();
  16.    
  17.     //Add elements to Arraylist
  18.     arrayList.add("A");
  19.     arrayList.add("B");
  20.     arrayList.add("C");
  21.     arrayList.add("D");
  22.     arrayList.add("E");
  23.    
  24.     System.out.println("Before shuffling, ArrayList contains : " + arrayList);
  25.    
  26.     /*
  27.       To shuffle elements of Java ArrayList use,
  28.       static void shuffle(List list) method of Collections class.
  29.     */
  30.    
  31.     Collections.shuffle(arrayList);
  32.    
  33.     System.out.println("After shuffling, ArrayList contains : " + arrayList);
  34.    
  35.   }
  36. }
  37.  
  38. /*
  39. Output would be
  40. Before shuffling, ArrayList contains : [A, B, C, D, E]
  41. After shuffling, ArrayList contains : [C, A, D, E, B]
  42. */