java.util.TreeMap.size() Method

Description

The size() method is used to return the number of key-value mappings in this map.

Declaration

Following is the declaration for java.util.TreeMap.size() method.

public int size()

Parameters

• NA

Return Value

The method call returns the number of key-value mappings in this map.

Exception

• NA

Example

The following example shows the usage of java.util.TreeMap.size()

package com.tutorialspoint;

import java.util.*;

public class TreeMapDemo {
   public static void main(String[] args) {
      // creating tree map 
      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, "five");    
      
      // getting size of the map
      System.out.println("Size of the map: "+treemap.size());      
   }    
}

Let us compile and run the above program, this will produce the following result.

Size of the map: 5