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Remove value from Java TreeMap example

  1. /*
  2.   Remove value from Java TreeMap example
  3.   This Java Example shows how to remove a key value pair from TreeMap object using
  4.   remove method.
  5. */
  6.  
  7. import java.util.TreeMap;
  8.  
  9. public class RemoveValueFromTreeMapExample {
  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 a key value pair from TreeMap use
  23.       Object remove(Object key) method of TreeMap class.
  24.       It returns either the value mapped with the key or null if no value
  25.       was mapped.    
  26.     */
  27.    
  28.     Object obj = treeMap.remove("2");
  29.     System.out.println(obj + " Removed from TreeMap");
  30.    
  31.   }
  32. }
  33. /*
  34. Output would be
  35. Two Removed from TreeMap
  36. */