java.net.ProtocolFamily Class in Java

ProtocolFamily is a java Interface. The java.net.ProtocolFamily represents a family of communication protocols. Java.net.StandardProtocolFamily implements ProtocolFamily Interface.

public interface ProtocolFamily 

Methods of java.net.ProtocolFamily

java.net.ProtocolFamily interface contains only one method:

S.No.	Method	Description	Return Type
1.	name()	name() method returns the name of the protocol family	String

Use of ProtocolFamily Interface

S.No.	Package	Modifier and Type	Name	Description
1.	java.net	class	StandardProtocolFamily	StandardProtocolFamily class defines the standard families of communication protocols.
2.	java.nio.channels	static DatagramChannel	DatagramChannel.open(ProtocolFamily family)	DatagramChannel.open() static method opens a datagram channel.
3.	java.nio.channels.spi	abstract DatagramChannel	SelectorProvider.openDatagramChannel( ProtocolFamily family)	SelectorProvider.openDatagramChannel Opens a datagram channel.

Java Program for Better Understanding of the ProtocolFamily Interface

Java

// Java Program to get Protocol
// family for an IP Address

// import Guava library
import com.google.common.net.InetAddresses;
import java.io.*;
import java.net.*;

class GFG {
    public static void main(String[] args)
    {
        try {
            // to get the ip address of
            InetAddress ip
                = InetAddress.getByName("45.22.30.39");
            System.out.println("Host Name is "
                               + ip.getHostName());

            // getProtocolFamily() will check and return the
            // protocol family of the given IP
            ProtocolFamily protocolFamily
                = getProtocolFamily(ip);

            System.out.println("Protocol family of the "
                               + ip.getHostName() + " is "
                               + protocolFamily);
        }
        catch (Exception e) {
            System.out.println("Some exception"
                               + e.getMessage());
        }
    }

    public static ProtocolFamily
    getProtocolFamily(InetAddress inetAddress)
    {
        // to check if address is valid or not
        if (InetAddresses.isInetAddress(
                inetAddress.getHostName())) {
            // if address is valid
            // will return the protocol family of the
            // address
            return StandardProtocolFamily.INET;
        }
        else {
            // address is not valid
            System.out.println(
                "Address " + inetAddress
                + "is invalid hence can't determine the protocol family");
        }
        return StandardProtocolFamily.INET;
    }
}

Output

Host Name is 45.22.30.39
Protocol family of the 45.22.30.39 is INET