javarray.html

javascript 1.5规范

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<A NAME="1199619"> </A>
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<ztabletext>In JavaScript 1.3 and earlier, this method returns a string identifying the object as a <FONT FACE="courier, couriernew, monospaced size">JavaArray</FONT>.</ztabletext>
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<A NAME="1198826"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>In JavaScript 1.4 and later, <FONT FACE="courier, couriernew, monospaced size">JavaArray</FONT> also inherits methods from the Java array superclass, <FONT FACE="courier, couriernew, monospaced size">java.lang.Object</FONT>.</zparagraph>
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<A NAME="Examples"> </A>
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<zrefheader>Examples</zrefheader>
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<A NAME="1198266"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph><B>Example 1.</B> Instantiating a <FONT FACE="courier, couriernew, monospaced size">JavaArray</FONT> in JavaScript.</zparagraph>
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<A NAME="1200128"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>In this example, the <FONT FACE="courier, couriernew, monospaced size">JavaArray</FONT> <FONT FACE="courier, couriernew, monospaced size">byteArray</FONT> is created by the <FONT FACE="courier, couriernew, monospaced size">java.lang.String.getBytes</FONT> method, which returns an array.</zparagraph>
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<A NAME="1200102"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2">
<zcodeline>var javaString = new java.lang.String("Hello world!");<br>
var byteArray  = javaString.getBytes();
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<A NAME="1200089"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph><B>Example 2.</B> Instantiating a <FONT FACE="courier, couriernew, monospaced size">JavaArray</FONT> in JavaScript with the <FONT FACE="courier, couriernew, monospaced size">newInstance</FONT> method.</zparagraph>
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<A NAME="1198267"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>In JavaScript 1.4, you can use a <FONT FACE="courier, couriernew, monospaced size">JavaClass</FONT> object as the argument for the <FONT FACE="courier, couriernew, monospaced size">newInstance</FONT> method which creates the array, as shown in the following code:</zparagraph>
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<A NAME="1198268"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2">
<zcodeline>var dogs = java.lang.reflect.Array.newInstance(java.lang.String, 5)
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<A NAME="1198403"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>In JavaScript 1.1, use a class object returned by <FONT FACE="courier, couriernew, monospaced size">java.lang.Class.forName</FONT> as the argument for the <FONT FACE="courier, couriernew, monospaced size">newInstance</FONT> method, as shown in the following code:</zparagraph>
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<A NAME="1198387"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2">
<zcodeline>var dataType = java.lang.Class.forName("java.lang.String")<br>
var dogs = java.lang.reflect.Array.newInstance(dataType, 5)
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<A NAME="1198970"> </A>
<A NAME="length"> </A>
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<zrefhead2>length</zrefhead2>
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<A NAME="1198971"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>The number of elements in the Java array represented by the <FONT FACE="courier, couriernew, monospaced size">JavaArray</FONT> object.<BR>
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<A NAME="1198974"> </A>
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<ztabletext><I>Property of</I></ztabletext>
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<A NAME="1198979"> </A>
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<ztabletext><A HREF="javarray.html#1193137"  >JavaArray</A></ztabletext>
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<A NAME="1198981"> </A>
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<ztabletext><I>Implemented in</I></ztabletext>
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<A NAME="1198983"> </A>
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<ztabletext>JavaScript 1.1, NES 2.0</ztabletext>
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<A NAME="1198988"> </A>
<A NAME="Description"> </A>
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<zrefheader>Description</zrefheader>
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<A NAME="1199785"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>Unlike <FONT FACE="courier, couriernew, monospaced size">Array.length</FONT>, <FONT FACE="courier, couriernew, monospaced size">JavaArray.length</FONT> is a read-only property. You cannot change the value of the <FONT FACE="courier, couriernew, monospaced size">JavaArray.length</FONT> property because Java arrays have a fixed number of elements.</zparagraph>
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<A NAME="1199908"> </A>
<A NAME="See also"> </A>
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<zrefheader>See also</zrefheader>
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<A NAME="1199909"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph><A HREF="array.html#1193439"  >Array.length</A></zparagraph>
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<A NAME="1198884"> </A>
<A NAME="toString"> </A>
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<zrefhead2>toString</zrefhead2>
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<A NAME="1198901"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>Returns a string representation of the JavaArray.<BR>
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<A NAME="1198887"> </A>
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<ztabletext><I>Method of</I></ztabletext>
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<A NAME="1198892"> </A>
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<ztabletext><A HREF="javarray.html#1193137"  >JavaArray</A></ztabletext>
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<A NAME="1198894"> </A>
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<ztabletext><I>Implemented in</I></ztabletext>
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<A NAME="1198896"> </A>
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<ztabletext>JavaScript 1.1, NES 2.0</ztabletext>
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<A NAME="1198904"> </A>
<A NAME="Parameters"> </A>
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<zrefheader>Parameters</zrefheader>
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<A NAME="1199692"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>None</zparagraph>
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<A NAME="1199693"> </A>
<A NAME="Description"> </A>
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<zrefheader>Description</zrefheader>
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<A NAME="1199694"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>Calls the method <FONT FACE="courier, couriernew, monospaced size">java.lang.Object.toString</FONT>, which returns the value of the following expression:</zparagraph>
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<A NAME="1199730"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2">
<zcodeline>JavaArray.getClass().getName() + '@' +<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;java.lang.Integer.toHexString(JavaArray.hashCode())
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<A NAME="1199705"> </A>
<A NAME="Backward compatibility"> </A>
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<zrefheader>Backward compatibility</zrefheader>
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<A NAME="1199718"> </A>
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<zheadrunin>JavaScript 1.3 and earlier. </zheadrunin>
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<A NAME="1199719"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>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>
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<A NAME="1199720"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2">
<zcodeline>[object JavaArray]
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   <P ALIGN="RIGHT">Last Updated <B>September 28, 2000</B>
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