The size() method of SortedMap interface in Java is used to get the size of the SortedMap which refers to the number of the key-value pair or mappings in the SortedMap.
Syntax:
int size()
Parameters: The method does not take any parameters.
Return Value: The method returns the size of the SortedMap which also means the number of key-value pairs present in the SortedMap.
Note: The size() method in SortedMap is inherited from the Map interface in Java.
Below programs illustrate the working of size() method:
Program 1: Mapping String Values to Integer Keys.
// Java code to illustrate the size() method import java.util.*;
public class Gfg {
public static void main(String[] args)
{
// Creating an empty SortedMap
SortedMap<Integer, String> map
= new TreeMap<Integer, String>();
// Mapping string values to int keys
map.put( 10 , "Geeks" );
map.put( 15 , "4" );
map.put( 20 , "Geeks" );
map.put( 25 , "Welcomes" );
map.put( 30 , "You" );
// Displaying the SortedMap
System.out.println(
"Initial Mappings are: "
+ map);
// Displaying the size of the map
System.out.println(
"The size of the map is "
+ map.size());
}
} |
Initial Mappings are: {10=Geeks, 15=4, 20=Geeks, 25=Welcomes, 30=You} The size of the map is 5
Program 2: Mapping Integer Values to String Keys.
// Java code to illustrate the size() method import java.util.*;
public class Gfg {
public static void main(String[] args)
{
// Creating an empty SortedMap
SortedMap<String, Integer> map
= new TreeMap<String, Integer>();
// Mapping int values to string keys
map.put( "Geeks" , 10 );
map.put( "4" , 15 );
map.put( "Geeks" , 20 );
map.put( "Welcomes" , 25 );
map.put( "You" , 30 );
// Displaying the SortedMap
System.out.println(
"Initial Mappings are: "
+ map);
// Displaying the size of the map
System.out.println(
"The size of the map is "
+ map.size());
}
} |
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.
Reference: https://docs.oracle.com/javase/9/docs/api/java/util/Map.html#size–