TreeMap size() Method in Java with Examples
Last Updated :
29 Nov, 2021
size() method of TreeMap class is used to get the size of the map which refers to the number of the key-value pair or mappings in the Map.
--> java.util package
--> TreeMap class
--> size() Method
Syntax:
Tree_Map.size()
Return Value: The size of the map which also means the number of key-value pairs present in the map.
Example 1: Mapping String Values to Integer Keys
Java
import java.util.*;
public class GFG {
public static void main(String[] args)
{
TreeMap<Integer, String> tree_map
= new TreeMap<Integer, String>();
tree_map.put( 10 , "Geeks" );
tree_map.put( 15 , "4" );
tree_map.put( 20 , "Geeks" );
tree_map.put( 25 , "Welcomes" );
tree_map.put( 30 , "You" );
System.out.println( "Initial Mappings are: "
+ tree_map);
System.out.println( "The size of the map is "
+ tree_map.size());
}
}
|
Output:
Initial Mappings are: {10=Geeks, 15=4, 20=Geeks, 25=Welcomes, 30=You}
The size of the map is 5
Example 2: Mapping Integer Values to String Keys
Java
import java.util.*;
public class GFG {
public static void main(String[] args)
{
TreeMap<String, Integer> tree_map
= new TreeMap<String, Integer>();
tree_map.put( "Geeks" , 10 );
tree_map.put( "4" , 15 );
tree_map.put( "Geeks" , 20 );
tree_map.put( "Welcomes" , 25 );
tree_map.put( "You" , 30 );
System.out.println( "Initial Mappings are: "
+ tree_map);
System.out.println( "The size of the map is "
+ tree_map.size());
}
}
|
Output:
Initial Mappings are: {4=15, Geeks=20, Welcomes=25, You=30}
The size of the map is 4
Note: The same operation can be performed with any type of Mappings with variation and combination of different data types.
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