URL getDefaultPort() method in Java with Examples

The getDefaultPort() function of URL class returns the default port of a specified URL. If the URL scheme or the URLStreamHandler for the URL do not define a default port number then the function returns -1.

Function Signature

public int getDefaultPort()

Syntax

url.getDefaultPort()

Parameter This function does not require any parameter

Return Value: The function returns an Integer value which is the default port of the specified URL.

Below examples will illustrate the use of getDefaultPort() function:

Example 1 Default port of HTTPS

// Java program to show the use
// of the function getDefaultPort()

import java.net.*;

class GFG {
    public static void main(String args[])
    {

        // url  object
        URL url = null;

        try {

            // create a URL
            url = new URL("https:// www.geeksforgeeks.org");

            // get the default port
            int default_port = url.getDefaultPort();

            // display the URL
            System.out.println("URL: " + url);

            // display the default port
            System.out.println("Default Port: "
                               + default_port);
        }

        // if any error occurs
        catch (Exception e) {

            // display the error
            System.out.println(e);
        }
    }
}

Output:

URL: https:// www.geeksforgeeks.org
Default Port: 443

Example 2: Default port of HTTP

// Java program to show the use
// of the function getDefaultPort()

import java.net.*;

class GFG {
    public static void main(String args[])
    {
        // url  object
        URL url = null;

        try {
            // create a URL
            url = new URL("http:// www.geeksforgeeks.org");

            // get the default port
            int default_port = url.getDefaultPort();

            // display the URL
            System.out.println("URL: " + url);

            // display the default port
            System.out.println("Default Port: "
                               + default_port);
        }

        // if any error occurs
        catch (Exception e) {

            // display the error
            System.out.println(e);
        }
    }
}

Output:

URL: http:// www.geeksforgeeks.org
Default Port: 80

Example 3 Default port of FTP

// Java program to show the use
// of the function getDefaultPort()

import java.net.*;

class GFG {
    public static void main(String args[])
    {
        // url  object
        URL url = null;

        try {

            // create a URL
            url = new URL("ftp:// www.geeksforgeeks.org");

            // get the default port
            int default_port = url.getDefaultPort();

            // display the URL
            System.out.println("URL: " + url);

            // display the default port
            System.out.println("Default Port: "
                               + default_port);
        }

        // if any error occurs
        catch (Exception e) {

            // display the error
            System.out.println(e);
        }
    }
}

Output:

URL: ftp:// www.geeksforgeeks.org
Default Port: 21