JavaTM 2 Platform
Std. Ed. v1.4.2

java.net
Class NetworkInterface

java.lang.Object
  extended byjava.net.NetworkInterface

public final class NetworkInterface
extends Object

This class represents a Network Interface made up of a name, and a list of IP addresses assigned to this interface. It is used to identify the local interface on which a multicast group is joined. Interfaces are normally known by names such as "le0".

Since:
1.4

Method Summary
 boolean equals(Object obj)
          Compares this object against the specified object.
static NetworkInterface getByInetAddress(InetAddress addr)
          Convenience method to search for a network interface that has the specified Internet Protocol (IP) address bound to it.
static NetworkInterface getByName(String name)
          Searches for the network interface with the specified name.
 String getDisplayName()
          Get the display name of this network interface.
 Enumeration getInetAddresses()
          Convenience method to return an Enumeration with all or a subset of the InetAddresses bound to this network interface.
 String getName()
          Get the name of this network interface.
static Enumeration getNetworkInterfaces()
          Returns all the interfaces on this machine.
 int hashCode()
          Returns a hash code value for the object.
 String toString()
          Returns a string representation of the object.
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Method Detail

getName

public String getName()
Get the name of this network interface.

Returns:
the name of this network interface

getInetAddresses

public Enumeration getInetAddresses()
Convenience method to return an Enumeration with all or a subset of the InetAddresses bound to this network interface.

If there is a security manager, its checkConnect method is called for each InetAddress. Only InetAddresses where the checkConnect doesn't throw a SecurityException will be returned in the Enumeration.

Returns:
an Enumeration object with all or a subset of the InetAddresses bound to this network interface

getDisplayName

public String getDisplayName()
Get the display name of this network interface. A display name is a human readable String describing the network device.

Returns:
the display name of this network interface, or null if no display name is available.

getByName

public static NetworkInterface getByName(String name)
                                  throws SocketException
Searches for the network interface with the specified name.

Parameters:
name - The name of the network interface.
Returns:
A NetworkInterface with the specified name, or null if there is no network interface with the specified name.
Throws:
SocketException - If an I/O error occurs.
NullPointerException - If the specified name is null.

getByInetAddress

public static NetworkInterface getByInetAddress(InetAddress addr)
                                         throws SocketException
Convenience method to search for a network interface that has the specified Internet Protocol (IP) address bound to it.

If the specified IP address is bound to multiple network interfaces it is not defined which network interface is returned.

Parameters:
addr - The InetAddress to search with.
Returns:
A NetworkInterface or null if there is no network interface with the specified IP address.
Throws:
SocketException - If an I/O error occurs.
NullPointerException - If the specified address is null.

getNetworkInterfaces

public static Enumeration getNetworkInterfaces()
                                        throws SocketException
Returns all the interfaces on this machine. Returns null if no network interfaces could be found on this machine. NOTE: can use getNetworkInterfaces()+getInetAddresses() to obtain all IP addresses for this node

Returns:
an Enumeration of NetworkInterfaces found on this machine
Throws:
SocketException - if an I/O error occurs.

equals

public boolean equals(Object obj)
Compares this object against the specified object. The result is true if and only if the argument is not null and it represents the same NetworkInterface as this object.

Two instances of NetworkInterface represent the same NetworkInterface if both name and addrs are the same for both.

Overrides:
equals in class Object
Parameters:
obj - the object to compare against.
Returns:
true if the objects are the same; false otherwise.
See Also:
InetAddress.getAddress()

hashCode

public int hashCode()
Description copied from class: Object
Returns a hash code value for the object. This method is supported for the benefit of hashtables such as those provided by java.util.Hashtable.

The general contract of hashCode is:

As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the JavaTM programming language.)

Overrides:
hashCode in class Object
Returns:
a hash code value for this object.
See Also:
Object.equals(java.lang.Object), Hashtable

toString

public String toString()
Description copied from class: Object
Returns a string representation of the object. In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.

The toString method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:

 getClass().getName() + '@' + Integer.toHexString(hashCode())
 

Overrides:
toString in class Object
Returns:
a string representation of the object.

JavaTM 2 Platform
Std. Ed. v1.4.2

Submit a bug or feature
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2003 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.


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