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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.5.0_02) on Wed Mar 22 19:19:05 PST 2006 --><TITLE>Applet (Java Card API and Subsets)</TITLE><META NAME="keywords" CONTENT="javacard.framework.Applet class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="Applet (Java Card API and Subsets)";}</SCRIPT><NOSCRIPT></NOSCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <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/Applet.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-all.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 Card </b><br><font size="-1">v2.2.2</font></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../javacard/framework/APDUException.html" title="class in javacard.framework"><B>PREV CLASS</B></A> <A HREF="../../javacard/framework/AppletEvent.html" title="interface in javacard.framework"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html?javacard/framework/Applet.html" target="_top"><B>FRAMES</B></A> <A HREF="Applet.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | 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><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">javacard.framework</FONT><BR>Class Applet</H2><PRE><A HREF="../../java/lang/Object.html" title="class in java.lang">java.lang.Object</A> <IMG SRC="../../resources/inherit.gif" ALT="extended by "><B>javacard.framework.Applet</B></PRE><HR><DL><DT><PRE>public abstract class <B>Applet</B><DT>extends <A HREF="../../java/lang/Object.html" title="class in java.lang">Object</A></DL></PRE><P>This abstract class defines an Java Card technology-based applet. <p> The <code>Applet</code> class must be extended by any applet that is intended to be loaded onto, installed into and executed on a Java Card technology-compliant smart card.<p> A compliant Java Card platform may optionally support the ISO7816-4 defined extended length APDU protocol. The applet subclass must implement the <code>javacardx.apdu.ExtendedLength</code> interface to access this extended length APDU protocol capability of the <code>javacard.framework.APDU</code> object. <p> Example usage of <code>Applet</code> <pre><code> public class MyApplet extends javacard.framework.Applet{ static byte someByteArray[]; public static void install( byte[] bArray, short bOffset, byte bLength ) throws ISOException { // make all my allocations here, so I do not run // out of memory later MyApplet theApplet = new MyApplet(); // check incoming parameter data byte iLen = bArray[bOffset]; // aid length bOffset = (short) (bOffset+iLen+1); byte cLen = bArray[bOffset]; // info length bOffset = (short) (bOffset+cLen+1); byte aLen = bArray[bOffset]; // applet data length // read first applet data byte byte bLen = bArray[(short)(bOffset+1)]; if ( bLen!=0 ) { someByteArray = new byte[bLen]; theApplet.register(); return; } else ISOException.throwIt(ISO7816.SW_FUNC_NOT_SUPPORTED); } public boolean select(){ // selection initialization someByteArray[17] = 42; // set selection state return true; } public void process(APDU apdu) throws ISOException{ byte[] buffer = apdu.getBuffer(); // .. process the incoming data and reply if ( buffer[ISO7816.OFFSET_CLA] == (byte)0 ) { switch ( buffer[ISO7816.OFFSET_INS] ) { case ISO.INS_SELECT: ... // send response data to select command short Le = apdu.setOutgoing(); // assume data containing response bytes in replyData[] array. if ( Le < ..) ISOException.throwIt( ISO7816.SW_WRONG_LENGTH); apdu.setOutgoingLength( (short)replyData.length ); apdu.sendBytesLong(replyData, (short) 0, (short)replyData.length); break; case ... } } } } </code></pre><P><P><DL><DT><B>See Also:</B><DD><A HREF="../../javacard/framework/SystemException.html" title="class in javacard.framework"><CODE>SystemException</CODE></A>, <A HREF="../../javacard/framework/JCSystem.html" title="class in javacard.framework"><CODE>JCSystem</CODE></A></DL><HR><P><!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TH></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="../../javacard/framework/Applet.html#Applet()">Applet</A></B>()</CODE><BR> Only this class's <code>install()</code> method should create the applet object.</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Method Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../javacard/framework/Applet.html#deselect()">deselect</A></B>()</CODE><BR> Called by the Java Card runtime environment to inform that this currently selected applet is being deselected on this logical channel and no applet from the same package is still active on any other logical channel.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../javacard/framework/Shareable.html" title="interface in javacard.framework">Shareable</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../javacard/framework/Applet.html#getShareableInterfaceObject(javacard.framework.AID, byte)">getShareableInterfaceObject</A></B>(<A HREF="../../javacard/framework/AID.html" title="class in javacard.framework">AID</A> clientAID, byte parameter)</CODE><BR> Called by the Java Card runtime environment to obtain a shareable interface object from this server applet, on behalf of a request from a client applet.</TD></TR>⌨️ 快捷键说明
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