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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Thu Apr 27 23:35:31 PDT 2000 --><TITLE>Java 2 Platform SE v1.3: Class DatagramSocketImpl</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/DatagramSocketImpl.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../index-files/index-1.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><b>Java<sup><font size=-2>TM</font></sup> 2 Platform<br>Std. Ed. v1.3</b></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../java/net/DatagramSocket.html"><B>PREV CLASS</B></A> <A HREF="../../java/net/HttpURLConnection.html"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="DatagramSocketImpl.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">java.net</FONT><BR>Class DatagramSocketImpl</H2><PRE><A HREF="../../java/lang/Object.html">java.lang.Object</A> | +--<B>java.net.DatagramSocketImpl</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../java/net/SocketOptions.html">SocketOptions</A></DD></DL><HR><DL><DT>public abstract class <B>DatagramSocketImpl</B><DT>extends <A HREF="../../java/lang/Object.html">Object</A><DT>implements <A HREF="../../java/net/SocketOptions.html">SocketOptions</A></DL><P>Abstract datagram and multicast socket implementation base class.<P><DL><DT><B>Since: </B><DD>JDK1.1</DD></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Field Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected <A HREF="../../java/io/FileDescriptor.html">FileDescriptor</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/DatagramSocketImpl.html#fd">fd</A></B></CODE><BR> The file descriptor object.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected int</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/DatagramSocketImpl.html#localPort">localPort</A></B></CODE><BR> The local port number.</TD></TR></TABLE> <A NAME="fields_inherited_from_class_java.net.SocketOptions"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from interface java.net.<A HREF="../../java/net/SocketOptions.html">SocketOptions</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../java/net/SocketOptions.html#IP_MULTICAST_IF">IP_MULTICAST_IF</A>, <A HREF="../../java/net/SocketOptions.html#SO_BINDADDR">SO_BINDADDR</A>, <A HREF="../../java/net/SocketOptions.html#SO_KEEPALIVE">SO_KEEPALIVE</A>, <A HREF="../../java/net/SocketOptions.html#SO_LINGER">SO_LINGER</A>, <A HREF="../../java/net/SocketOptions.html#SO_RCVBUF">SO_RCVBUF</A>, <A HREF="../../java/net/SocketOptions.html#SO_REUSEADDR">SO_REUSEADDR</A>, <A HREF="../../java/net/SocketOptions.html#SO_SNDBUF">SO_SNDBUF</A>, <A HREF="../../java/net/SocketOptions.html#SO_TIMEOUT">SO_TIMEOUT</A>, <A HREF="../../java/net/SocketOptions.html#TCP_NODELAY">TCP_NODELAY</A></CODE></TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/net/DatagramSocketImpl.html#DatagramSocketImpl()">DatagramSocketImpl</A></B>()</CODE><BR> </TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected abstract void</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/DatagramSocketImpl.html#bind(int, java.net.InetAddress)">bind</A></B>(int lport, <A HREF="../../java/net/InetAddress.html">InetAddress</A> laddr)</CODE><BR> Binds a datagram socket to a local port and address.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected abstract void</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/DatagramSocketImpl.html#close()">close</A></B>()</CODE><BR> Close the socket.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected abstract void</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/DatagramSocketImpl.html#create()">create</A></B>()</CODE><BR> Creates a datagram socket.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected <A HREF="../../java/io/FileDescriptor.html">FileDescriptor</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/DatagramSocketImpl.html#getFileDescriptor()">getFileDescriptor</A></B>()</CODE><BR> Gets the datagram socket file descriptor.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected int</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/DatagramSocketImpl.html#getLocalPort()">getLocalPort</A></B>()</CODE><BR> Gets the local port.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected abstract int</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/DatagramSocketImpl.html#getTimeToLive()">getTimeToLive</A></B>()</CODE><BR> Retrieve the TTL (time-to-live) option.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected abstract byte</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/DatagramSocketImpl.html#getTTL()">getTTL</A></B>()</CODE><BR> <B>Deprecated.</B> <I>use getTimeToLive instead.</I></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected abstract void</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/DatagramSocketImpl.html#join(java.net.InetAddress)">join</A></B>(<A HREF="../../java/net/InetAddress.html">InetAddress</A> inetaddr)</CODE><BR> Join the multicast group.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected abstract void</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/DatagramSocketImpl.html#leave(java.net.InetAddress)">leave</A></B>(<A HREF="../../java/net/InetAddress.html">InetAddress</A> inetaddr)</CODE><BR> Leave the multicast group.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected abstract int</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/DatagramSocketImpl.html#peek(java.net.InetAddress)">peek</A></B>(<A HREF="../../java/net/InetAddress.html">InetAddress</A> i)</CODE><BR> Peek at the packet to see who it is from.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected abstract void</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/DatagramSocketImpl.html#receive(java.net.DatagramPacket)">receive</A></B>(<A HREF="../../java/net/DatagramPacket.html">DatagramPacket</A> p)</CODE><BR> Receive the datagram packet.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected abstract void</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/DatagramSocketImpl.html#send(java.net.DatagramPacket)">send</A></B>(<A HREF="../../java/net/DatagramPacket.html">DatagramPacket</A> p)</CODE><BR> Sends a datagram packet.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected abstract void</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/DatagramSocketImpl.html#setTimeToLive(int)">setTimeToLive</A></B>(int ttl)</CODE><BR> Set the TTL (time-to-live) option.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected abstract void</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/DatagramSocketImpl.html#setTTL(byte)">setTTL</A></B>(byte ttl)</CODE><BR> <B>Deprecated.</B> <I>use setTimeToLive instead.</I></TD></TR></TABLE> <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from class java.lang.<A HREF="../../java/lang/Object.html">Object</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../java/lang/Object.html#clone()">clone</A>, <A HREF="../../java/lang/Object.html#equals(java.lang.Object)">equals</A>, <A HREF="../../java/lang/Object.html#finalize()">finalize</A>, <A HREF="../../java/lang/Object.html#getClass()">getClass</A>, <A HREF="../../java/lang/Object.html#hashCode()">hashCode</A>, <A HREF="../../java/lang/Object.html#notify()">notify</A>, <A HREF="../../java/lang/Object.html#notifyAll()">notifyAll</A>, <A HREF="../../java/lang/Object.html#toString()">toString</A>, <A HREF="../../java/lang/Object.html#wait()">wait</A>, <A HREF="../../java/lang/Object.html#wait(long)">wait</A>, <A HREF="../../java/lang/Object.html#wait(long, int)">wait</A></CODE></TD></TR></TABLE> <A NAME="methods_inherited_from_class_java.net.SocketOptions"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from interface java.net.<A HREF="../../java/net/SocketOptions.html">SocketOptions</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../java/net/SocketOptions.html#getOption(int)">getOption</A>, <A HREF="../../java/net/SocketOptions.html#setOption(int, java.lang.Object)">setOption</A></CODE></TD></TR></TABLE> <P><!-- ============ FIELD DETAIL =========== --><A NAME="field_detail"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Field Detail</B></FONT></TD></TR></TABLE><A NAME="localPort"><!-- --></A><H3>localPort</H3><PRE>protected int <B>localPort</B></PRE><DL><DD>The local port number.</DL><HR><A NAME="fd"><!-- --></A><H3>fd</H3><PRE>⌨️ 快捷键说明
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