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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 23:36:47 PDT 2000 --><TITLE>Java 2 Platform SE v1.3: Class AbstractSet</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/AbstractSet.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/util/AbstractSequentialList.html"><B>PREV CLASS</B></A> <A HREF="../../java/util/ArrayList.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="AbstractSet.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | <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.util</FONT><BR>Class AbstractSet</H2><PRE><A HREF="../../java/lang/Object.html">java.lang.Object</A> | +--<A HREF="../../java/util/AbstractCollection.html">java.util.AbstractCollection</A> | +--<B>java.util.AbstractSet</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../java/util/Collection.html">Collection</A>, <A HREF="../../java/util/Set.html">Set</A></DD></DL><DL><DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../java/util/HashSet.html">HashSet</A>, <A HREF="../../java/util/TreeSet.html">TreeSet</A></DD></DL><HR><DL><DT>public abstract class <B>AbstractSet</B><DT>extends <A HREF="../../java/util/AbstractCollection.html">AbstractCollection</A><DT>implements <A HREF="../../java/util/Set.html">Set</A></DL><P>This class provides a skeletal implementation of the <tt>Set</tt> interface to minimize the effort required to implement this interface. <p> The process of implementing a set by extending this class is identical to that of implementing a Collection by extending AbstractCollection, except that all of the methods and constructors in subclasses of this class must obey the additional constraints imposed by the <tt>Set</tt> interface (for instance, the add method must not permit addition of multiple intances of an object to a set).<p> Note that this class does not override any of the implementations from the <tt>AbstractCollection</tt> class. It merely adds implementations for <tt>equals</tt> and <tt>hashCode</tt>.<P><DL><DT><B>Since: </B><DD>1.2</DD><DT><B>See Also: </B><DD><A HREF="../../java/util/Collection.html"><CODE>Collection</CODE></A>, <A HREF="../../java/util/AbstractCollection.html"><CODE>AbstractCollection</CODE></A>, <A HREF="../../java/util/Set.html"><CODE>Set</CODE></A></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><!-- ======== 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 ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected </CODE></FONT></TD><TD><CODE><B><A HREF="../../java/util/AbstractSet.html#AbstractSet()">AbstractSet</A></B>()</CODE><BR> Sole constructor.</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> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/util/AbstractSet.html#equals(java.lang.Object)">equals</A></B>(<A HREF="../../java/lang/Object.html">Object</A> o)</CODE><BR> Compares the specified object with this set for equality.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/util/AbstractSet.html#hashCode()">hashCode</A></B>()</CODE><BR> Returns the hash code value for this set.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/util/AbstractSet.html#removeAll(java.util.Collection)">removeAll</A></B>(<A HREF="../../java/util/Collection.html">Collection</A> c)</CODE><BR> Removes from this set all of its elements that are contained in the specified collection (optional operation).</TD></TR></TABLE> <A NAME="methods_inherited_from_class_java.util.AbstractCollection"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from class java.util.<A HREF="../../java/util/AbstractCollection.html">AbstractCollection</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../java/util/AbstractCollection.html#add(java.lang.Object)">add</A>, <A HREF="../../java/util/AbstractCollection.html#addAll(java.util.Collection)">addAll</A>, <A HREF="../../java/util/AbstractCollection.html#clear()">clear</A>, <A HREF="../../java/util/AbstractCollection.html#contains(java.lang.Object)">contains</A>, <A HREF="../../java/util/AbstractCollection.html#containsAll(java.util.Collection)">containsAll</A>, <A HREF="../../java/util/AbstractCollection.html#isEmpty()">isEmpty</A>, <A HREF="../../java/util/AbstractCollection.html#iterator()">iterator</A>, <A HREF="../../java/util/AbstractCollection.html#remove(java.lang.Object)">remove</A>, <A HREF="../../java/util/AbstractCollection.html#retainAll(java.util.Collection)">retainAll</A>, <A HREF="../../java/util/AbstractCollection.html#size()">size</A>, <A HREF="../../java/util/AbstractCollection.html#toArray()">toArray</A>, <A HREF="../../java/util/AbstractCollection.html#toArray(java.lang.Object[])">toArray</A>, <A HREF="../../java/util/AbstractCollection.html#toString()">toString</A></CODE></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">⌨️ 快捷键说明
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