observable.html

API資料大全

</TR>
</TABLE>
&nbsp;<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>
&nbsp;
<P>

<!-- ============ FIELD DETAIL =========== -->


<!-- ========= CONSTRUCTOR DETAIL ======== -->

<A NAME="constructor_detail"><!-- --></A>
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=1><FONT SIZE="+2">
<B>Constructor Detail</B></FONT></TD>
</TR>
</TABLE>

<A NAME="Observable()"><!-- --></A><H3>
Observable</H3>
<PRE>
public <B>Observable</B>()</PRE>
<DL>
<DD>Construct an Observable with zero Observers.</DL>

<!-- ============ METHOD DETAIL ========== -->

<A NAME="method_detail"><!-- --></A>
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=1><FONT SIZE="+2">
<B>Method Detail</B></FONT></TD>
</TR>
</TABLE>

<A NAME="addObserver(java.util.Observer)"><!-- --></A><H3>
addObserver</H3>
<PRE>
public void <B>addObserver</B>(<A HREF="../../java/util/Observer.html">Observer</A>&nbsp;o)</PRE>
<DL>
<DD>Adds an observer to the set of observers for this object, provided 
 that it is not the same as some observer already in the set. 
 The order in which notifications will be delivered to multiple 
 observers is not specified. See the class comment.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>o</CODE> - an observer to be added.</DL>
</DD>
</DL>
<HR>

<A NAME="deleteObserver(java.util.Observer)"><!-- --></A><H3>
deleteObserver</H3>
<PRE>
public void <B>deleteObserver</B>(<A HREF="../../java/util/Observer.html">Observer</A>&nbsp;o)</PRE>
<DL>
<DD>Deletes an observer from the set of observers of this object.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>o</CODE> - the observer to be deleted.</DL>
</DD>
</DL>
<HR>

<A NAME="notifyObservers()"><!-- --></A><H3>
notifyObservers</H3>
<PRE>
public void <B>notifyObservers</B>()</PRE>
<DL>
<DD>If this object has changed, as indicated by the 
 <code>hasChanged</code> method, then notify all of its observers 
 and then call the <code>clearChanged</code> method to 
 indicate that this object has no longer changed. 
 <p>
 Each observer has its <code>update</code> method called with two
 arguments: this observable object and <code>null</code>. In other 
 words, this method is equivalent to:
 <blockquote><tt>
 notifyObservers(null)</tt></blockquote><DD><DL>
<DT><B>See Also: </B><DD><A HREF="../../java/util/Observable.html#clearChanged()"><CODE>clearChanged()</CODE></A>, 
<A HREF="../../java/util/Observable.html#hasChanged()"><CODE>hasChanged()</CODE></A>, 
<A HREF="../../java/util/Observer.html#update(java.util.Observable, java.lang.Object)"><CODE>Observer.update(java.util.Observable, java.lang.Object)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="notifyObservers(java.lang.Object)"><!-- --></A><H3>
notifyObservers</H3>
<PRE>
public void <B>notifyObservers</B>(<A HREF="../../java/lang/Object.html">Object</A>&nbsp;arg)</PRE>
<DL>
<DD>If this object has changed, as indicated by the 
 <code>hasChanged</code> method, then notify all of its observers 
 and then call the <code>clearChanged</code> method to indicate 
 that this object has no longer changed. 
 <p>
 Each observer has its <code>update</code> method called with two
 arguments: this observable object and the <code>arg</code> argument.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>arg</CODE> - any object.<DT><B>See Also: </B><DD><A HREF="../../java/util/Observable.html#clearChanged()"><CODE>clearChanged()</CODE></A>, 
<A HREF="../../java/util/Observable.html#hasChanged()"><CODE>hasChanged()</CODE></A>, 
<A HREF="../../java/util/Observer.html#update(java.util.Observable, java.lang.Object)"><CODE>Observer.update(java.util.Observable, java.lang.Object)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="deleteObservers()"><!-- --></A><H3>
deleteObservers</H3>
<PRE>
public void <B>deleteObservers</B>()</PRE>
<DL>
<DD>Clears the observer list so that this object no longer has any observers.</DL>
<HR>

<A NAME="setChanged()"><!-- --></A><H3>
setChanged</H3>
<PRE>
protected void <B>setChanged</B>()</PRE>
<DL>
<DD>Marks this <tt>Observable</tt> object as having been changed; the 
 <tt>hasChanged</tt> method will now return <tt>true</tt>.</DL>
<HR>

<A NAME="clearChanged()"><!-- --></A><H3>
clearChanged</H3>
<PRE>
protected void <B>clearChanged</B>()</PRE>
<DL>
<DD>Indicates that this object has no longer changed, or that it has 
 already notified all of its observers of its most recent change, 
 so that the <tt>hasChanged</tt> method will now return <tt>false</tt>. 
 This method is called automatically by the 
 <code>notifyObservers</code> methods.<DD><DL>
<DT><B>See Also: </B><DD><A HREF="../../java/util/Observable.html#notifyObservers()"><CODE>notifyObservers()</CODE></A>, 
<A HREF="../../java/util/Observable.html#notifyObservers(java.lang.Object)"><CODE>notifyObservers(java.lang.Object)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="hasChanged()"><!-- --></A><H3>
hasChanged</H3>
<PRE>
public boolean <B>hasChanged</B>()</PRE>
<DL>
<DD>Tests if this object has changed.<DD><DL>
<DT><B>Returns:</B><DD><code>true</code> if and only if the <code>setChanged</code> 
          method has been called more recently than the 
          <code>clearChanged</code> method on this object; 
          <code>false</code> otherwise.<DT><B>See Also: </B><DD><A HREF="../../java/util/Observable.html#clearChanged()"><CODE>clearChanged()</CODE></A>, 
<A HREF="../../java/util/Observable.html#setChanged()"><CODE>setChanged()</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="countObservers()"><!-- --></A><H3>
countObservers</H3>
<PRE>
public int <B>countObservers</B>()</PRE>
<DL>
<DD>Returns the number of observers of this <tt>Observable</tt> object.<DD><DL>
<DT><B>Returns:</B><DD>the number of observers of this object.</DL>
</DD>
</DL>
<!-- ========= END OF CLASS DATA ========= -->
<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>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> &nbsp;<FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="class-use/Observable.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../index-files/index-1.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A>&nbsp;</TD>
  </TR>
</TABLE>
</TD>
<TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM>
<b>Java<sup><font size=-2>TM</font></sup>&nbsp;2&nbsp;Platform<br>Std.&nbsp;Ed. v1.3</b></EM>
</TD>
</TR>

<TR>
<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">
&nbsp;<A HREF="../../java/util/Locale.html"><B>PREV CLASS</B></A>&nbsp;
&nbsp;<A HREF="../../java/util/Properties.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>  &nbsp;
&nbsp;<A HREF="Observable.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD>
</TR>
<TR>
<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
  SUMMARY: &nbsp;INNER&nbsp;|&nbsp;FIELD&nbsp;|&nbsp;<A HREF="#constructor_summary">CONSTR</A>&nbsp;|&nbsp;<A HREF="#method_summary">METHOD</A></FONT></TD>
<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
DETAIL: &nbsp;FIELD&nbsp;|&nbsp;<A HREF="#constructor_detail">CONSTR</A>&nbsp;|&nbsp;<A HREF="#method_detail">METHOD</A></FONT></TD>
</TR>
</TABLE>
<!-- =========== END OF NAVBAR =========== -->

<HR>
<font size="-1"><a href="http://java.sun.com/cgi-bin/bugreport.cgi">Submit a bug or feature</a><br>For further API reference and developer documentation, see <a href="http://java.sun.com/products/jdk/1.3/devdocs-vs-specs.html">Java 2 SDK SE Developer Documentation</a>. That documentation  contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. <p>Java, Java 2D, and JDBC are trademarks or registered trademarks of Sun Microsystems, Inc. in the US and other countries.<br>Copyright 1993-2000 Sun Microsystems, Inc. 901 San Antonio Road<br>Palo Alto, California, 94303, U.S.A.  All Rights Reserved.</font>
</BODY>
</HTML>