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Replace All Elements Of Java ArrayList Example

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  1. /*
  2.   Replace All Elements Of Java ArrayList Example
  3.   This java example shows how to replace all elements of Java ArrayList object with
  4.   the specified element using fill method of Collections class.
  5. */
  6.  
  7. import java.util.ArrayList;
  8. import java.util.Collections;
  9.  
  10. public class ReplaceAllElementsOfArrayListExample {
  11.  
  12.   public static void main(String[] args) {
  13.     //create a ArrayList object
  14.     ArrayList arrayList = new ArrayList();
  15.    
  16.     //Add elements to ArrayList
  17.     arrayList.add("A");
  18.     arrayList.add("B");
  19.     arrayList.add("D");
  20.  
  21.     /*
  22.       To replace all elements of Java ArrayList with specified element use,
  23.       static void fill(List list, Object element) method of Collections class.
  24.     */
  25.    
  26.     System.out.println("Before replacement, ArrayList contains : " + arrayList);
  27.    
  28.     Collections.fill(arrayList,"REPLACED");
  29.    
  30.     System.out.println("After replacement, ArrayList contains : " + arrayList);
  31.  
  32.   }
  33. }
  34.  
  35. /*
  36. Output would be
  37. Before replacement, ArrayList contains : [A, B, D]
  38. After replacement, ArrayList contains : [REPLACED, REPLACED, REPLACED]
  39. */