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its elements (see Comparable), or by a Comparator provided at sorted set creation time.</TD></TR></TABLE> <P><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor"><TD COLSPAN=2>Classes in <A HREF="../../../java/util/package-summary.html">java.util</A> that implement <A HREF="../../../java/util/Set.html">Set</A></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> class</CODE></FONT></TD><TD><CODE><B><A HREF="../../../java/util/AbstractSet.html">AbstractSet</A></B></CODE><BR> This class provides a skeletal implementation of the <tt>Set</tt> interface to minimize the effort required to implement this interface.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> class</CODE></FONT></TD><TD><CODE><B><A HREF="../../../java/util/HashSet.html">HashSet</A></B></CODE><BR> This class implements the <tt>Set</tt> interface, backed by a hash table (actually a <tt>HashMap</tt> instance).</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> class</CODE></FONT></TD><TD><CODE><B><A HREF="../../../java/util/TreeSet.html">TreeSet</A></B></CODE><BR> This class implements the <tt>Set</tt> interface, backed by a <tt>TreeMap</tt> instance.</TD></TR></TABLE> <P><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor"><TD COLSPAN=2>Fields in <A HREF="../../../java/util/package-summary.html">java.util</A> declared as <A HREF="../../../java/util/Set.html">Set</A></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../../java/util/Set.html">Set</A></CODE></FONT></TD><TD><CODE><B>Collections.</B><B><A HREF="../../../java/util/Collections.html#EMPTY_SET">EMPTY_SET</A></B></CODE><BR> The empty set (immutable).</TD></TR></TABLE> <P><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor"><TD COLSPAN=2>Methods in <A HREF="../../../java/util/package-summary.html">java.util</A> that return <A HREF="../../../java/util/Set.html">Set</A></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/util/Set.html">Set</A></CODE></FONT></TD><TD><CODE><B>Hashtable.</B><B><A HREF="../../../java/util/Hashtable.html#keySet()">keySet</A></B>()</CODE><BR> Returns a Set view of the keys contained in this Hashtable.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/util/Set.html">Set</A></CODE></FONT></TD><TD><CODE><B>Hashtable.</B><B><A HREF="../../../java/util/Hashtable.html#entrySet()">entrySet</A></B>()</CODE><BR> Returns a Set view of the entries contained in this Hashtable.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/util/Set.html">Set</A></CODE></FONT></TD><TD><CODE><B>AbstractMap.</B><B><A HREF="../../../java/util/AbstractMap.html#keySet()">keySet</A></B>()</CODE><BR> Returns a Set view of the keys contained in this map.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>abstract <A HREF="../../../java/util/Set.html">Set</A></CODE></FONT></TD><TD><CODE><B>AbstractMap.</B><B><A HREF="../../../java/util/AbstractMap.html#entrySet()">entrySet</A></B>()</CODE><BR> Returns a set view of the mappings contained in this map.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../../java/util/Set.html">Set</A></CODE></FONT></TD><TD><CODE><B>Collections.</B><B><A HREF="../../../java/util/Collections.html#unmodifiableSet(java.util.Set)">unmodifiableSet</A></B>(<A HREF="../../../java/util/Set.html">Set</A> s)</CODE><BR> Returns an unmodifiable view of the specified set.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../../java/util/Set.html">Set</A></CODE></FONT></TD><TD><CODE><B>Collections.</B><B><A HREF="../../../java/util/Collections.html#synchronizedSet(java.util.Set)">synchronizedSet</A></B>(<A HREF="../../../java/util/Set.html">Set</A> s)</CODE><BR> Returns a synchronized (thread-safe) set backed by the specified set.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../../java/util/Set.html">Set</A></CODE></FONT></TD><TD><CODE><B>Collections.</B><B><A HREF="../../../java/util/Collections.html#singleton(java.lang.Object)">singleton</A></B>(<A HREF="../../../java/lang/Object.html">Object</A> o)</CODE><BR> Returns an immutable set containing only the specified object.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/util/Set.html">Set</A></CODE></FONT></TD><TD><CODE><B>WeakHashMap.</B><B><A HREF="../../../java/util/WeakHashMap.html#entrySet()">entrySet</A></B>()</CODE><BR> Returns a <code>Set</code> view of the mappings in this map.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/util/Set.html">Set</A></CODE></FONT></TD><TD><CODE><B>TreeMap.</B><B><A HREF="../../../java/util/TreeMap.html#keySet()">keySet</A></B>()</CODE><BR> Returns a Set view of the keys contained in this map.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/util/Set.html">Set</A></CODE></FONT></TD><TD><CODE><B>TreeMap.</B><B><A HREF="../../../java/util/TreeMap.html#entrySet()">entrySet</A></B>()</CODE><BR> Returns a set view of the mappings contained in this map.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/util/Set.html">Set</A></CODE></FONT></TD><TD><CODE><B>HashMap.</B><B><A HREF="../../../java/util/HashMap.html#keySet()">keySet</A></B>()</CODE><BR> Returns a set view of the keys contained in this map.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/util/Set.html">Set</A></CODE></FONT></TD><TD><CODE><B>HashMap.</B><B><A HREF="../../../java/util/HashMap.html#entrySet()">entrySet</A></B>()</CODE><BR> Returns a collection view of the mappings contained in this map.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/util/Set.html">Set</A></CODE></FONT></TD><TD><CODE><B>Map.</B><B><A HREF="../../../java/util/Map.html#keySet()">keySet</A></B>()</CODE><BR> Returns a set view of the keys contained in this map.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/util/Set.html">Set</A></CODE></FONT></TD><TD><CODE><B>Map.</B><B><A HREF="../../../java/util/Map.html#entrySet()">entrySet</A></B>()</CODE><BR> Returns a set view of the mappings contained in this map.</TD></TR></TABLE> <P><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor"><TD COLSPAN=2>Methods in <A HREF="../../../java/util/package-summary.html">java.util</A> with parameters of type <A HREF="../../../java/util/Set.html">Set</A></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../../java/util/Set.html">Set</A></CODE></FONT></TD><TD><CODE><B>Collections.</B><B><A HREF="../../../java/util/Collections.html#unmodifiableSet(java.util.Set)">unmodifiableSet</A></B>(<A HREF="../../../java/util/Set.html">Set</A> s)</CODE><BR> Returns an unmodifiable view of the specified set.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../../java/util/Set.html">Set</A></CODE></FONT></TD><TD><CODE><B>Collections.</B><B><A HREF="../../../java/util/Collections.html#synchronizedSet(java.util.Set)">synchronizedSet</A></B>(<A HREF="../../../java/util/Set.html">Set</A> s)</CODE><BR> Returns a synchronized (thread-safe) set backed by the specified set.</TD></TR></TABLE> <P><A NAME="java.util.jar"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2">Uses of <A HREF="../../../java/util/Set.html">Set</A> in <A HREF="../../../java/util/jar/package-summary.html">java.util.jar</A></FONT></TD></TR></TABLE> <P><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor"><TD COLSPAN=2>Methods in <A HREF="../../../java/util/jar/package-summary.html">java.util.jar</A> that return <A HREF="../../../java/util/Set.html">Set</A></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/util/Set.html">Set</A></CODE></FONT></TD><TD><CODE><B>Attributes.</B><B><A HREF="../../../java/util/jar/Attributes.html#keySet()">keySet</A></B>()</CODE><BR> Returns a Set view of the attribute names (keys) contained in this Map.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/util/Set.html">Set</A></CODE></FONT></TD><TD><CODE><B>Attributes.</B><B><A HREF="../../../java/util/jar/Attributes.html#entrySet()">entrySet</A></B>()</CODE><BR> Returns a Collection view of the attribute name-value mappings contained in this Map.</TD></TR></TABLE> <P><HR><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_bottom"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_bottom_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="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../java/util/Set.html"><FONT 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