Java Collection Tutorial - Java TreeMap.size()


TreeMap.size() has the following syntax.

public int size()


In the following code shows how to use TreeMap.size() method.

import java.util.TreeMap;
/*from  ww w.  j ava  2s  .com*/
public class Main {
   public static void main(String[] args) {
      TreeMap<Integer, String>  treemap = new TreeMap<Integer, String> ();
      // populating tree map
      treemap.put(2, "two");
      treemap.put(1, "one");
      treemap.put(3, "three");
      treemap.put(6, "six");
      treemap.put(5, "from");    
      // getting size of the map
      System.out.println("Size of the map: "+treemap.size());      

The code above generates the following result.