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Converted to HTML in WebWorks Publisher 2000. manual wdt 1.5"> <META NAME="LASTUPDATED" CONTENT="09/28/00 13:15:33"> <TITLE> Core JavaScript Reference 1.5: </TITLE></HEAD><BODY TEXT="#000000" LINK="#666699" VLINK="#666699" ALINK="#333366" BGCOLOR="#FFFFFF"><MAINCONTENT><NAVIGATIONCONTENT> <TABLE WIDTH="100%" BORDER="0" CELLSPACING="4"> <TR> <TD VALIGN="TOP"> <b><a href="java.html"><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2" COLOR="#993300">Previous</a></FONT> </b><a href="contents.html"><b><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2" COLOR="#993300">Contents</a></FONT></b> <a href="ix.html"><b><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2" COLOR="#993300">Index</a></FONT></b> <a href="javclass.html"><b><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2" COLOR="#993300">Next</a></FONT></b> </TD> </TR> <TR> <TD VALIGN="TOP" ALIGN="RIGHT" BGCOLOR="#CCCCCC"> <FONT FACE="Arial, Helvetica, sans-serif" COLOR="#000000" SIZE="2"><B> Core JavaScript Reference 1.5</B></FONT> </TD> </TR> <TR> </TABLE> <BR></NAVIGATIONCONTENT><BOOKCONTENT> <blockquote><BR><BR> <BR><BR><P><A NAME="1193137"> </A><A NAME="JavaArray"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="5"><B><zrefhead1>JavaArray</zrefhead1></B></FONT><P><A NAME="1193151"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>A wrapped Java array accessed from within JavaScript code is a member of the type <FONT FACE="courier, couriernew, monospaced size">JavaArray</FONT>.<BR><P><TABLE WIDTH="90%" BORDER="1" CELLPADDING="5" CELLSPACING="0"> <CAPTION></CAPTION><P><FONT FACE=""><B></B></FONT><BR><BR> <TR> <TD VALIGN=TOP><P><A NAME="1193140"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><I>Core object</I></ztabletext></FONT> </TD> <TD VALIGN=TOP><P><A NAME="1193142"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext></ztabletext></FONT> </TD> </TR> <TR> <TD VALIGN=TOP><P><A NAME="1193144"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><I>Implemented in</I></ztabletext></FONT> </TD> <TD VALIGN=TOP><P><A NAME="1193146"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext>JavaScript 1.1, NES 2.0</ztabletext></FONT> </TD> </TR></TABLE><P></zparagraph></FONT><P><BR><A NAME="1193152"> </A><A NAME="Created by"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><zrefheader>Created by</zrefheader></B></FONT><BR><A NAME="1193153"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>Any Java method which returns an array. In addition, you can create a <FONT FACE="courier, couriernew, monospaced size">JavaArray</FONT> with an arbitrary data type using the <FONT FACE="courier, couriernew, monospaced size">newInstance</FONT> method of the <FONT FACE="courier, couriernew, monospaced size">Array</FONT> class:</zparagraph></FONT><P><A NAME="1200452"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2"><zcodeline>public static Object newInstance(Class componentType,<br> int length)<br> throws NegativeArraySizeException</zcodeline></FONT><P><BR><A NAME="1193162"> </A><A NAME="Description"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><zrefheader>Description</zrefheader></B></FONT><BR><A NAME="1198224"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>The <FONT FACE="courier, couriernew, monospaced size">JavaArray</FONT> object is an instance of a Java array that is created in or passed to JavaScript. <FONT FACE="courier, couriernew, monospaced size">JavaArray</FONT> is a wrapper for the instance; all references to the array instance are made through the <FONT FACE="courier, couriernew, monospaced size">JavaArray</FONT>.</zparagraph></FONT><P><A NAME="1200559"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>In JavaScript 1.4 and later, the <FONT FACE="courier, couriernew, monospaced size">componentType</FONT> parameter is either a <FONT FACE="courier, couriernew, monospaced size">JavaClass</FONT> object representing the type of the array or class object, such as one returned by <FONT FACE="courier, couriernew, monospaced size">java.lang.Class.forName</FONT>. In JavaScript 1.3 and earlier, <FONT FACE="courier, couriernew, monospaced size">componentType</FONT> must be a class object.</zparagraph></FONT><P><A NAME="1200750"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>Use zero-based indexes to access the elements in a <FONT FACE="courier, couriernew, monospaced size">JavaArray</FONT> object, just as you do to access elements in an array in Java. For example:</zparagraph></FONT><P><A NAME="1200760"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2"><zcodeline>var javaString = new java.lang.String("Hello world!");<br>var byteArray = javaString.getBytes();<br>byteArray[0] // returns 72<br>byteArray[1] // returns 101</zcodeline></FONT><P><A NAME="1200981"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>Any Java data brought into JavaScript is converted to JavaScript data types. When the <FONT FACE="courier, couriernew, monospaced size">JavaArray</FONT> is passed back to Java, the array is unwrapped and can be used by Java code. See the <A HREF="http://developer.netscape.com/docs/manuals/js/core/jsguide/index.htm"><I>Core JavaScript Guide</I></A> for more information about data type conversions.</zparagraph></FONT><P><A NAME="1201008"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>In JavaScript 1.4 and later, the methods of <FONT FACE="courier, couriernew, monospaced size">java.lang.Object</FONT> are inherited by <FONT FACE="courier, couriernew, monospaced size">JavaArray</FONT>.</zparagraph></FONT><P><BR><A NAME="1200997"> </A><A NAME="Backward compatibility"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><zrefheader>Backward compatibility</zrefheader></B></FONT><BR><P><A NAME="1199085"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><zheadrunin>JavaScript 1.3 and earlier. </zheadrunin></B></FONT><A NAME="1199229"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>The methods of <FONT FACE="courier, couriernew, monospaced size">java.lang.Object</FONT> are not inherited by <FONT FACE="courier, couriernew, monospaced size">JavaArray</FONT>. In addition, the <FONT FACE="courier, couriernew, monospaced size">toString</FONT> method is inherited from the <FONT FACE="courier, couriernew, monospaced size">Object</FONT> object and returns the following value:</zparagraph></FONT><P><A NAME="1199499"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2"><zcodeline>[object JavaArray]</zcodeline></FONT><P><A NAME="1199826"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>You must specify a class object, such as one returned by <FONT FACE="courier, couriernew, monospaced size">java.lang.Object.forName</FONT>, for the <FONT FACE="courier, couriernew, monospaced size">componentType</FONT> parameter of <FONT FACE="courier, couriernew, monospaced size">newInstance</FONT> when you use this method to create an array. You cannot use a <FONT FACE="courier, couriernew, monospaced size">JavaClass</FONT> object for the <FONT FACE="courier, couriernew, monospaced size">componentType</FONT> parameter.</zparagraph></FONT><P><BR><A NAME="1199292"> </A><A NAME="Property Summary "> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><zrefheader>Property Summary </zrefheader></B></FONT><BR><A NAME="1199333"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph><BR><P><TABLE WIDTH="90%" BORDER="1" CELLPADDING="5" CELLSPACING="0"> <CAPTION></CAPTION><P><FONT FACE=""><B></B></FONT><BR><BR> <TR BGCOLOR="#CCCCCC" ALIGN=LEFT VALIGN=TOP> <TH VALIGN=TOP ALIGN=LEFT><A NAME="1199295"> </A><P ALIGN="LEFT"><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><ztablehead>Property</ztablehead></B></FONT></TH> <TH VALIGN=TOP ALIGN=LEFT><A NAME="1199297"> </A><P ALIGN="LEFT"><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><ztablehead>Description</ztablehead></B></FONT></TH> </DIV></TR> <TR> <TD VALIGN=TOP><A NAME="1199323"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2"><zcodeline><A HREF="javarray.html#1198970" >length</A></zcodeline></FONT><P> </TD> <TD VALIGN=TOP><P><A NAME="1199325"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext>The number of elements in the Java array represented by <FONT FACE="courier, couriernew, monospaced size">JavaArray</FONT>.</ztabletext></FONT> </TD> </TR></TABLE><P></zparagraph></FONT><P><BR><A NAME="1199230"> </A><A NAME="Method Summary"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><zrefheader>Method Summary</zrefheader></B></FONT><BR><A NAME="1199244"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph><BR><P><TABLE WIDTH="90%" BORDER="1" CELLPADDING="5" CELLSPACING="0"> <CAPTION></CAPTION><P><FONT FACE=""><B></B></FONT><BR><BR> <TR BGCOLOR="#CCCCCC" ALIGN=LEFT VALIGN=TOP> <TH VALIGN=TOP ALIGN=LEFT><A NAME="1199233"> </A><P ALIGN="LEFT"><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><ztablehead>Method</ztablehead></B></FONT></TH> <TH VALIGN=TOP ALIGN=LEFT><A NAME="1199235"> </A><P ALIGN="LEFT"><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><ztablehead>Description</ztablehead></B></FONT></TH> </DIV></TR> <TR> <TD VALIGN=TOP><A NAME="1199241"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2"><zcodeline><A HREF="javarray.html#1198884" >toString</A></zcodeline></FONT><P> </TD> <TD VALIGN=TOP><P><A NAME="1199243"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext>In JavaScript 1.4, this method is overridden by the inherited method <FONT FACE="courier, couriernew, monospaced size">java.lang.Object.toString</FONT>.</ztabletext>?? 快捷鍵說(shuō)明
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