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
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