java.net

Class InetAddress

java.lang.Object

java.net.InetAddress

public class InetAddress
extends Object

Constructor Summary

Constructors

Constructor and Description
InetAddress() InetAddress
InetAddress(int addr)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj) Compares two Objects for equality.
byte[]	getAddress()
static InetAddress[]	getAllByName(String s)
static InetAddress	getByName(String host) Resolves the supplied host name into an IP address.
String	getHostAddress()
String	getHostName()
static InetAddress	getLocalHost()
int	hashCode() Returns a hash code value for the object.
boolean	isMulticastAddress()
static void	resetIPAddress(String host) Removes the entry for the specified host/domain from the ARP cache.
String	toString() Returns a string representation of the object.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

InetAddress

public InetAddress()

InetAddress

InetAddress

public InetAddress(int addr)

Parameters:

addr - ?

Method Detail

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:

• Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer. This integer need not remain consistent from one execution of an application to another execution of the same application.
• If two objects are equal according to the equals method, then calling the hashCode method on each of the two objects must produce the same integer result.

Overrides:

hashCode in class Object

Returns:

a hash code value for this object.

See Also:

Object.equals(java.lang.Object), Hashtable

resetIPAddress

public static void resetIPAddress(String host)

Removes the entry for the specified host/domain from the ARP cache. A subsequent call to InetAdderss.getByName() will freshly resolve the host which for DNS pools may then return a different IP address.

Parameters:

host - the host/domain name

getByName

public static InetAddress getByName(String host)
                             throws UnknownHostException

Resolves the supplied host name into an IP address.

Parameters:

host - the host/domain name

Returns:

InetAddres object representing the host's IP address?

Throws:

UnknownHostException - if the host cannot be resolved

equals

public boolean equals(Object obj)

Description copied from class: Object

Compares two Objects for equality.

The equals method implements an equivalence relation:

• It is reflexive: for any reference value x, x.equals(x) should return true.
• It is symmetric: for any reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
• It is transitive: for any reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
• It is consistent: for any reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false.
• For any reference value x, x.equals(null) should return false.

The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any reference values x and y, this method returns true if and only if x and y refer to the same object (x==y has the value true).

Overrides:

equals in class Object

Parameters:

obj - the reference object with which to compare.

Returns:

true if this object is the same as the obj argument; false otherwise.

See Also:

Boolean.hashCode(), Hashtable

getAddress

public byte[] getAddress()

Returns:

?

getAllByName

public static InetAddress[] getAllByName(String s)
                                  throws UnknownHostException

Parameters:

s - ?

Returns:

?

Throws:

UnknownHostException - ?

getHostAddress

public String getHostAddress()

Returns:

?

getHostName

public String getHostName()

Returns:

?

getLocalHost

public static InetAddress getLocalHost()
                                throws UnknownHostException

Returns:

?

Throws:

UnknownHostException - ?

isMulticastAddress

public boolean isMulticastAddress()

Returns:

?

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.

Overrides:

toString in class Object

Returns:

a string representation of the object.