SortedMap size() method in Java with Examples

Last Updated : 30 Sep, 2019

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

// 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());
    }
}

Output:

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

// 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());
    }
}

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. Reference: https://docs.oracle.com/javase/9/docs/api/java/util/Map.html#size--