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Check if a particular value exists in Java TreeMap example

  1. /*
  2.   Check if a particular value exists in Java TreeMap example
  3.   This Java Example shows how to check if TreeMap object contains a particular
  4.   value using containsValue method of TreeMap class.
  5. */
  6.  
  7. import java.util.TreeMap;
  8.  
  9. public class CheckValueOfTreeMapExample {
  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 check whether a particular value exists in TreeMap use
  23.       boolean containsValue(Object key) method of TreeMap class.
  24.       It returns true if the value is mapped to one or more keys in the
  25.       TreeMap otherwise false.
  26.     */
  27.    
  28.     boolean blnExists = treeMap.containsValue("Three");
  29.     System.out.println("Three exists in TreeMap ? : " + blnExists);
  30.   }
  31. }
  32.  
  33. /*
  34. Output would be
  35. Three exists in TreeMap ? : true
  36. */