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–
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