How to get the size of TreeMap example – Java

In this tutorial we willl learn how to get the size of a TreeMap. We are using size() method of TreeMap class to get the number of key-value mappings of a TreeMap. Here is the complete code:

Example

import java.util.TreeMap;

class TreeMapSize {
  public static void main(String args[]) {
 
    // Create a TreeMap
    TreeMap<String, String> treemap = 
              new TreeMap<String, String>();

    // Put elements to the map
    treemap.put("Key1", "Value1");
    treemap.put("Key2", "Value2");
    treemap.put("Key3", "Value3");
    treemap.put("Key4", "Value4");
    treemap.put("Key5", "Value5");
 
    // Displaying size of the TreeMap
    /* public int size(): Returns the number of key-value 
     * mappings in this map.
     */
    System.out.println("Size of TreeMap: "+treemap.size());
  }
}

Output:

Size of TreeMap: 5