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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 19:19:07 PST 2006 --><TITLE>Util (Java Card API and Subsets)</TITLE><META NAME="keywords" CONTENT="javacard.framework.Util class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="Util (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/Util.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/UserException.html" title="class in javacard.framework"><B>PREV CLASS</B></A> NEXT CLASS</FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html?javacard/framework/Util.html" target="_top"><B>FRAMES</B></A> <A HREF="Util.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 | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | CONSTR | <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 Util</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.Util</B></PRE><HR><DL><DT><PRE>public class <B>Util</B><DT>extends <A HREF="../../java/lang/Object.html" title="class in java.lang">Object</A></DL></PRE><P>The <code>Util</code> class contains common utility functions. Some of the methods may be implemented as native functions for performance reasons. All methods in <code>Util</code>, class are static methods.<p> Some methods of <code>Util</code>, namely <code>arrayCopy()</code>, <code>arrayCopyNonAtomic()</code>, <code>arrayFillNonAtomic()</code> and <code>setShort()</code>, refer to the persistence of array objects. The term <em>persistent</em> means that arrays and their values persist from one CAD session to the next, indefinitely. The <code>JCSystem</code> class is used to control the persistence and transience of objects.<P><P><DL><DT><B>See Also:</B><DD><A HREF="../../javacard/framework/JCSystem.html" title="class in javacard.framework"><CODE>JCSystem</CODE></A></DL><HR><P><!-- ========== 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>static byte</CODE></FONT></TD><TD><CODE><B><A HREF="../../javacard/framework/Util.html#arrayCompare(byte[], short, byte[], short, short)">arrayCompare</A></B>(byte[] src, short srcOff, byte[] dest, short destOff, short length)</CODE><BR> Compares an array from the specified source array, beginning at the specified position, with the specified position of the destination array from left to right.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static short</CODE></FONT></TD><TD><CODE><B><A HREF="../../javacard/framework/Util.html#arrayCopy(byte[], short, byte[], short, short)">arrayCopy</A></B>(byte[] src, short srcOff, byte[] dest, short destOff, short length)</CODE><BR> Copies an array from the specified source array, beginning at the specified position, to the specified position of the destination array.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static short</CODE></FONT></TD><TD><CODE><B><A HREF="../../javacard/framework/Util.html#arrayCopyNonAtomic(byte[], short, byte[], short, short)">arrayCopyNonAtomic</A></B>(byte[] src, short srcOff, byte[] dest, short destOff, short length)</CODE><BR> Copies an array from the specified source array, beginning at the specified position, to the specified position of the destination array (non-atomically).</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static short</CODE></FONT></TD><TD><CODE><B><A HREF="../../javacard/framework/Util.html#arrayFillNonAtomic(byte[], short, short, byte)">arrayFillNonAtomic</A></B>(byte[] bArray, short bOff, short bLen, byte bValue)</CODE><BR> Fills the byte array (non-atomically) beginning at the specified position, for the specified length with the specified byte value.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static short</CODE></FONT></TD><TD><CODE><B><A HREF="../../javacard/framework/Util.html#getShort(byte[], short)">getShort</A></B>(byte[] bArray, short bOff)</CODE><BR> Concatenates two bytes in a byte array to form a short value.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static short</CODE></FONT></TD><TD><CODE><B><A HREF="../../javacard/framework/Util.html#makeShort(byte, byte)">makeShort</A></B>(byte b1, byte b2)</CODE><BR> Concatenates the two parameter bytes to form a short value.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static short</CODE></FONT></TD><TD><CODE><B><A HREF="../../javacard/framework/Util.html#setShort(byte[], short, short)">setShort</A></B>(byte[] bArray, short bOff, short sValue)</CODE><BR> Deposits the short value as two successive bytes at the specified offset in the byte array.</TD></TR></TABLE> <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="../../java/lang/Object.html" title="class in java.lang">Object</A></B></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../java/lang/Object.html#equals(java.lang.Object)">equals</A></CODE></TD></TR></TABLE> <P><!-- ============ METHOD DETAIL ========== --><A NAME="method_detail"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"><B>Method Detail</B></FONT></TH></TR></TABLE><A NAME="arrayCopy(byte[], short, byte[], short, short)"><!-- --></A><H3>arrayCopy</H3><PRE>public static final short <B>arrayCopy</B>(byte[] src, short srcOff, byte[] dest, short destOff, short length) throws <A HREF="../../java/lang/ArrayIndexOutOfBoundsException.html" title="class in java.lang">ArrayIndexOutOfBoundsException</A>, <A HREF="../../java/lang/NullPointerException.html" title="class in java.lang">NullPointerException</A>, <A HREF="../../javacard/framework/TransactionException.html" title="class in javacard.framework">TransactionException</A></PRE><DL><DD>Copies an array from the specified source array, beginning at the specified position, to the specified position of the destination array. <p> Note:<ul> <li><em>If </em><code>srcOff</code><em> or </em><code>destOff</code><em> or </em><code>length</code><em> parameter is negative an </em><code>ArrayIndexOutOfBoundsException</code><em> exception is thrown.</em></li> <li><em>If </em><code>srcOff+length</code><em> is greater than </em><code>src.length</code><em>, the length of the </em><code>src</code><em> array a </em><code>ArrayIndexOutOfBoundsException</code><em> exception is thrown and no copy is performed.</em></li> <li><em>If </em><code>destOff+length</code><em> is greater than </em><code>dest.length</code><em>, the length of the </em><code>dest</code><em> array an </em><code>ArrayIndexOutOfBoundsException</code><em> exception is thrown and no copy is performed.</em></li> <li><em>If </em><code>src</code><em> or </em><code>dest</code><em> parameter is </em><code>null</code><em></li> a </em><code>NullPointerException</code><em> exception is thrown.</em></li> <li><em>If the <code>src</code> and <code>dest</code> arguments refer to the same array object, then the copying is performed as if the components at positions </em><code>srcOff</code><em> through </em><code>srcOff+length-1</code><em> were first copied to a temporary array with </em><code>length</code><em> components and then the contents of the temporary array were copied into positions </em><code>destOff</code><em> through </em><code>destOff+length-1</code><em> of the argument array.</em></li> <li><em>If the destination array is persistent, the entire copy is performed atomically.</em></li> <li><em>The copy operation is subject to atomic commit capacity limitations. If the commit capacity is exceeded, no copy is performed and a </em><code>TransactionException</code><em> exception is thrown.</em></li>⌨️ 快捷键说明
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