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Get Size of Java TreeMap Example

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  1. /*
  2.   Get Size of Java TreeMap Example
  3.   This Java Example shows how to get the size or nubmer of key value pairs
  4.   stored in TreeMap using size method.
  5. */
  6.  
  7. import java.util.TreeMap;
  8.  
  9. public class GetSizeOfTreeMapExample{
  10.  
  11.   public static void main(String[] args) {
  12.    
  13.     //create TreeMap object
  14.     TreeMap treeMap = new TreeMap();
  15.    
  16.     /*
  17.       To get the size of TreeMap use
  18.       int size() method of TreeMap class. It returns the number of key value
  19.       pairs stored in TreeMap object.    
  20.     */
  21.     System.out.println("Size of TreeMap : " + treeMap.size());
  22.    
  23.     //add key value pairs to TreeMap using put method
  24.     treeMap.put("1","One");
  25.     treeMap.put("2","Two");
  26.     treeMap.put("3","Three");
  27.     System.out.println("Size of TreeMap after addition : " + treeMap.size());
  28.    
  29.     //remove one element from TreeMap using remove method
  30.     Object obj = treeMap.remove("2");
  31.     System.out.println("Size of TreeMap after removal : " + treeMap.size());
  32.   }
  33. }
  34.  
  35. /*
  36. Output would be
  37. Size of TreeMap : 0
  38. Size of TreeMap after addition : 3
  39. Size of TreeMap after removal : 2
  40. */