Dictionary size() Method in Java with Examples
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
