This class represents a network interface address. Every device that has an IP address has an IP address on the network interface. In fact the ping command doesn’t ping a device but the devices interface address. Java provides certain methods to deal with interface addresses which can be used in places where there is a need to know the topology of the network, for fault detection in a network etc.
Methods :
- getAddress() : Returns an InetAddress for this address.
Syntax : public InetAddress getAddress()
- getBroadcast() : Returns the InetAddress for the broadcast address for this interface address. As only IPv4 addresses have broadcast addresses, null would be returned on using an IPv6 address.
Syntax :public InetAddress getBroadcast()
- getNetworkPrefixLength() : Returns the prefix length for this interface address, i.e. subnet mask for this address.
Syntax :public short getNetworkPrefixLength()
- equals() : Used for comparison of the specified object with this interface address. Returns true only if the given object is not null and represents same interface address as this object.
Syntax :public boolean equals(Object obj) Parameters : obj : obj to compare with
- hashCode() : Returns the hashcode for this interface address.
Syntax :public int hashCode()
- toString() : Returns a string representation of this interface address. The string is of the form : Interface Address/ prefix length.
Syntax :public String toString()
Java Implementation :
Java
// Java program to illustrate methods of// Java.net.InterfaceAddress classimport java.net.InterfaceAddress;import java.net.NetworkInterface;import java.net.SocketException;import java.util.List;public class interfaceaddress{ public static void main(String[] args) throws SocketException { // Modify according to your system NetworkInterface nif = NetworkInterface.getByIndex(1); List<InterfaceAddress> list = nif.getInterfaceAddresses(); for (InterfaceAddress iaddr : list) { // getAddress() method System.out.println("getAddress() : " + iaddr.getAddress()); // getBroadcast() method System.out.println("getBroadcast() : " + iaddr.getBroadcast()); // getNetworkPrefixLength() method System.out.println("PrefixLength : " + iaddr.getNetworkPrefixLength()); // hashCode() method System.out.println("Hashcode : " + iaddr.hashCode()); // toString() method System.out.println("toString() : " + iaddr.toString()); System.out.println("--------------------\n"); } }} |
Output :
getAddress() : /127.0.0.1 getBroadcast() : /127.255.255.255 PrefixLength : 8 Hashcode : -16777208 toString() : /127.0.0.1/8 [/127.255.255.255] -------------------- getAddress() : /0:0:0:0:0:0:0:1 getBroadcast() : null PrefixLength : 128 Hashcode : 129 toString() : /0:0:0:0:0:0:0:1/128 [null] --------------------
Please modify the index in getbyIndex() method in the above program as the network interface at index 1 might be null in your system. For more details about the this method, refer to- java.net.NetworkInterface class
References :
Official Java Documentation
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