Get Size of Java TreeMap Example

/*
  Get Size of Java TreeMap Example
  This Java Example shows how to get the size or nubmer of key value pairs
  stored in TreeMap using size method.
*/
 
import java.util.TreeMap;
 
public class GetSizeOfTreeMapExample{
 
  public static void main(String[] args) {
 
    //create TreeMap object
    TreeMap treeMap = new TreeMap();
 
    /*
      To get the size of TreeMap use
      int size() method of TreeMap class. It returns the number of key value
      pairs stored in TreeMap object.     
    */
    System.out.println("Size of TreeMap : " + treeMap.size());
 
    //add key value pairs to TreeMap using put method
    treeMap.put("1","One");
    treeMap.put("2","Two");
    treeMap.put("3","Three");
    System.out.println("Size of TreeMap after addition : " + treeMap.size());
 
    //remove one element from TreeMap using remove method
    Object obj = treeMap.remove("2");
    System.out.println("Size of TreeMap after removal : " + treeMap.size());
  }
}
 
/*
Output would be
Size of TreeMap : 0
Size of TreeMap after addition : 3
Size of TreeMap after removal : 2
*/