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–
