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Create List containing n Copies of Specified Object Example

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  1. /*
  2.   Create List containing n Copies of Specified Object Example
  3.   This java example shows how to create a list consisting n copies of specified
  4.   copies using nCopies method of Collections class.
  5. */
  6.  
  7. import java.util.Collections;
  8. import java.util.List;
  9. import java.util.Iterator;
  10.  
  11. public class CreateListOfNCopiesExample {
  12.  
  13.   public static void main(String[] args) {
  14.    
  15.     /*
  16.       To create a List containing n copies of specified Object use,
  17.       static List nCopies(int n, Object obj) method of Java Collections class.
  18.      
  19.       This method returns immutable List containing n copies of the
  20.       specified Object.
  21.     */
  22.    
  23.     List list = Collections.nCopies(5,"A");
  24.    
  25.     //iterate through newly created list
  26.     System.out.println("List contains, ");
  27.     Iterator itr = list.iterator();
  28.    
  29.     while(itr.hasNext())
  30.       System.out.println(itr.next());
  31.    
  32.   }
  33. }
  34.  
  35. /*
  36. Output would be
  37. List contains,
  38. A
  39. A
  40. A
  41. A
  42. A
  43. */