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Java Hashtable size() Method with Example

Hashtable Class size() method: Here, we are going to learn about the size() method of Hashtable Class with its syntax and example.
Submitted by Preeti Jain, on February 17, 2020

Hashtable Class size() method

• size() method is available in java.util package.
• size() method is used to return the number of key-value pairs that exist in this Hashtable.
• size() method is a non-static method, it is accessible with the class object only 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 size.

Syntax:

    public int size();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is int, it returns the number of key-value pairs exists in this Hashtable.

Example:

// Java program to demonstrate the example 
// of int size() method of Hashtable 

import java.util.*;

public class SizeOfHashtable {
    public static void main(String[] args) {
        // Instantiate a hashtable object  
        Hashtable ht = new Hashtable();

        // By using put() method is to
        // add the linked values in an
        // Hashtable ht
        ht.put(10, "C");
        ht.put(20, "C++");
        ht.put(30, "JAVA");
        ht.put(40, "PHP");
        ht.put(50, "SFDC");

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

        // By using size() method is to
        // return the size of this Hashtable
        int size = ht.size();
        System.out.println("ht.size(): " + size);
    }
}

Output

Hashtable: {10=C, 20=C++, 30=JAVA, 40=PHP, 50=SFDC}
ht.size(): 5