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Java Dictionary size() Method with Example

Dictionary Class size() method: Here, we are going to learn about the size() method of Dictionary Class with its syntax and example.
Submitted by Preeti Jain, on February 13, 2020

Dictionary Class size() method

• size() method is available in java.util package.
• size() method is used to return the number of different key-value pairs in this dictionary.
• size() method is a non-static method, it is accessible with the class object and if we try to access the method with the class name then we will get an error.
• size() method does not throw an exception at the time of returning the size of this dictionary.

Syntax:

    public abstract int size();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of this method is int, it returns the size of this dictionary (i.e. Different key-value pairs exists in this dictionary).

Example:

// Java program is to demonstrate the example of
// size() method of Dictionary

import java.util.*;

public class SizeOfDictionary {
    public static void main(String[] args) {
        // Instantiate a Hashtable object
        Dictionary dictionary = new Hashtable();

        // By using put() method is to
        // add an elements in Hashtable 
        dictionary.put(1, "C");
        dictionary.put(2, "C++");
        dictionary.put(3, "JAVA");
        dictionary.put(4, "PHP");
        dictionary.put(5, "SFDC");

        // Display dictionary
        System.out.println("dictionary: " + dictionary);

        // By using size() method is to return
        // the size of this Dictionary i.e.
        // how many unique key-value pair exists.
        int size = dictionary.size();

        // Display Dictionary Size
        System.out.println("dictionary.size(): " + size);
    }
}

Output

dictionary: {5=SFDC, 4=PHP, 3=JAVA, 2=C++, 1=C}
dictionary.size(): 5