The size() Method of Dictionary class in Java is used to know the size of the dictionary or the number of distinct keys present in the dictionary.
Syntax:
DICTIONARY.size()
Parameters:
The method does not accept any parameters.
Return Value:
The method returns the number of keys present in the dictionary.
Below programs illustrate the size() Method of Dictionary:
Program 1:
// Java Code to illustrate size()import java.util.*; public class Dictionary_Demo { public static void main(String args[]) { // Creating a dictionary of Hashtable Dictionary<Integer, String> dict = new Hashtable<Integer, String>(); // Inserting elements into the Dictionary dict.put(10, "Geeks"); dict.put(15, "4"); dict.put(10, "Geeks"); dict.put(25, "Welcomes"); dict.put(30, "You"); // Displaying the Dictionary System.out.println("Dictionary: " + dict); // Displaying the size of the dictionary System.out.println("The size of the dictionary is " + dict.size()); }} |
Output:
Dictionary: {10=Geeks, 30=You, 15=4, 25=Welcomes}
The size of the dictionary is 4
Program 2:
// Java Code to illustrate size()import java.util.*; public class Dictionary_Demo { public static void main(String args[]) { // Creating a dictionary of Hashtable Dictionary<String, Integer> dict = new Hashtable<String, Integer>(); // Inserting elements into the table dict.put("Geek", 10); dict.put("4", 15); dict.put("Geeks", 20); dict.put("Welcomes", 25); dict.put("You", 30); // Displaying the Dictionary System.out.println("Dictionary: " + dict); // Displaying the size of the dictionary System.out.println("The size of the dictionary is " + dict.size()); }} |
Output:
Dictionary: {You=30, Welcomes=25, 4=15, Geeks=20, Geek=10}
The size of the dictionary is 5
