inetaddress.html

API資料大全

<DT><B>Returns:</B><DD>a <code>boolean</code> indicating if the InetAddress is 
 an IP multicast address<DT><B>Since: </B><DD>JDK1.1</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="getHostName()"><!-- --></A><H3>
getHostName</H3>
<PRE>
public <A HREF="../../java/lang/String.html">String</A> <B>getHostName</B>()</PRE>
<DL>
<DD>Gets the host name for this IP address.

 <p>If there is a security manager, its
 <code>checkConnect</code> method is first called
 with the hostname and <code>-1</code> 
 as its arguments to see if the operation is allowed.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the host name for this IP address.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/lang/SecurityException.html">SecurityException</A></CODE> - if a security manager exists and its  
  <code>checkConnect</code> method doesn't allow the operation .<DT><B>See Also: </B><DD><A HREF="../../java/lang/SecurityManager.html#checkConnect(java.lang.String, int)"><CODE>SecurityManager.checkConnect(java.lang.String, int)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="getAddress()"><!-- --></A><H3>
getAddress</H3>
<PRE>
public byte[] <B>getAddress</B>()</PRE>
<DL>
<DD>Returns the raw IP address of this <code>InetAddress</code>
 object. The result is in network byte order: the highest order
 byte of the address is in <code>getAddress()[0]</code>.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the raw IP address of this object.</DL>
</DD>
</DL>
<HR>

<A NAME="getHostAddress()"><!-- --></A><H3>
getHostAddress</H3>
<PRE>
public <A HREF="../../java/lang/String.html">String</A> <B>getHostAddress</B>()</PRE>
<DL>
<DD>Returns the IP address string "%d.%d.%d.%d".<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the raw IP address in a string format.<DT><B>Since: </B><DD>JDK1.0.2</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="hashCode()"><!-- --></A><H3>
hashCode</H3>
<PRE>
public int <B>hashCode</B>()</PRE>
<DL>
<DD>Returns a hashcode for this IP address.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/lang/Object.html#hashCode()">hashCode</A></CODE> in class <CODE><A HREF="../../java/lang/Object.html">Object</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>a hash code value for this IP address.</DL>
</DD>
</DL>
<HR>

<A NAME="equals(java.lang.Object)"><!-- --></A><H3>
equals</H3>
<PRE>
public boolean <B>equals</B>(<A HREF="../../java/lang/Object.html">Object</A>&nbsp;obj)</PRE>
<DL>
<DD>Compares this object against the specified object.
 The result is <code>true</code> if and only if the argument is
 not <code>null</code> and it represents the same IP address as
 this object.
 <p>
 Two instances of <code>InetAddress</code> represent the same IP
 address if the length of the byte arrays returned by
 <code>getAddress</code> is the same for both, and each of the
 array components is the same for the byte arrays.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/lang/Object.html#equals(java.lang.Object)">equals</A></CODE> in class <CODE><A HREF="../../java/lang/Object.html">Object</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>obj</CODE> - the object to compare against.<DT><B>Returns:</B><DD><code>true</code> if the objects are the same;
          <code>false</code> otherwise.<DT><B>See Also: </B><DD><A HREF="../../java/net/InetAddress.html#getAddress()"><CODE>getAddress()</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public <A HREF="../../java/lang/String.html">String</A> <B>toString</B>()</PRE>
<DL>
<DD>Converts this IP address to a <code>String</code>.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/lang/Object.html#toString()">toString</A></CODE> in class <CODE><A HREF="../../java/lang/Object.html">Object</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>a string representation of this IP address.</DL>
</DD>
</DL>
<HR>

<A NAME="getByName(java.lang.String)"><!-- --></A><H3>
getByName</H3>
<PRE>
public static <A HREF="../../java/net/InetAddress.html">InetAddress</A> <B>getByName</B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;host)
                             throws <A HREF="../../java/net/UnknownHostException.html">UnknownHostException</A></PRE>
<DL>
<DD>Determines the IP address of a host, given the host's name. The
 host name can either be a machine name, such as
 "<code>java.sun.com</code>", or a string representing its IP
 address, such as "<code>206.26.48.100</code>".<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>host</CODE> - the specified host, or <code>null</code> for the
                    local host.<DT><B>Returns:</B><DD>an IP address for the given host name.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/net/UnknownHostException.html">UnknownHostException</A></CODE> - if no IP address for the
               <code>host</code> could be found.</DL>
</DD>
</DL>
<HR>

<A NAME="getAllByName(java.lang.String)"><!-- --></A><H3>
getAllByName</H3>
<PRE>
public static <A HREF="../../java/net/InetAddress.html">InetAddress</A>[] <B>getAllByName</B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;host)
                                  throws <A HREF="../../java/net/UnknownHostException.html">UnknownHostException</A></PRE>
<DL>
<DD>Determines all the IP addresses of a host, given the host's name.
 The host name can either be a machine name, such as
 "<code>java.sun.com</code>", or a string representing
 its IP address, such as "<code>206.26.48.100</code>".

 <p>If there is a security manager and <code>host</code> is not 
 null and <code>host.length() </code> is not equal to zero, the
 security manager's
 <code>checkConnect</code> method is called
 with the hostname and <code>-1</code> 
 as its arguments to see if the operation is allowed.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>host</CODE> - the name of the host.<DT><B>Returns:</B><DD>an array of all the IP addresses for a given host name.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/net/UnknownHostException.html">UnknownHostException</A></CODE> - if no IP address for the
               <code>host</code> could be found.<DD><CODE><A HREF="../../java/lang/SecurityException.html">SecurityException</A></CODE> - if a security manager exists and its  
               <code>checkConnect</code> method doesn't allow the operation.<DT><B>See Also: </B><DD><A HREF="../../java/lang/SecurityManager.html#checkConnect(java.lang.String, int)"><CODE>SecurityManager.checkConnect(java.lang.String, int)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="getLocalHost()"><!-- --></A><H3>
getLocalHost</H3>
<PRE>
public static <A HREF="../../java/net/InetAddress.html">InetAddress</A> <B>getLocalHost</B>()
                                throws <A HREF="../../java/net/UnknownHostException.html">UnknownHostException</A></PRE>
<DL>
<DD>Returns the local host.

 <p>If there is a security manager, its
 <code>checkConnect</code> method is called
 with the local host name and <code>-1</code> 
 as its arguments to see if the operation is allowed.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the IP address of the local host.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/net/UnknownHostException.html">UnknownHostException</A></CODE> - if no IP address for the
               <code>host</code> could be found.<DD><CODE><A HREF="../../java/lang/SecurityException.html">SecurityException</A></CODE> - if a security manager exists and its  
               <code>checkConnect</code> method doesn't allow the operation.<DT><B>See Also: </B><DD><A HREF="../../java/lang/SecurityManager.html#checkConnect(java.lang.String, int)"><CODE>SecurityManager.checkConnect(java.lang.String, int)</CODE></A></DL>
</DD>
</DL>
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