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Remove all values from Java TreeMap example

  1. /*
  2.   Remove all values from Java TreeMap example
  3.   This Java Example shows how to remove all values from TreeMap object or empty
  4.   TreeMap or clear TreeMap using clear method.
  5. */
  6.  
  7. import java.util.TreeMap;
  8.  
  9. public class EmptyTreeMapExample {
  10.  
  11.   public static void main(String[] args) {
  12.    
  13.     //create TreeMap object
  14.     TreeMap treeMap = new TreeMap();
  15.    
  16.     //add key value pairs to TreeMap
  17.     treeMap.put("1","One");
  18.     treeMap.put("2","Two");
  19.     treeMap.put("3","Three");
  20.  
  21.     /*
  22.       To remove all values or clear TreeMap use
  23.       void clear method() of TreeMap class. Clear method removes all
  24.       key value pairs contained in TreeMap.
  25.     */
  26.    
  27.     treeMap.clear();
  28.    
  29.     System.out.println("Total key value pairs in TreeMap are : " + treeMap.size());
  30.   }
  31. }
  32.  
  33. /*
  34. Output would be
  35. Total key value pairs in TreeMap are : 0
  36. */

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