package-summary.html

API資料大全

<TD WIDTH="15%"><B><A HREF="OutOfMemoryError.html">OutOfMemoryError</A></B></TD>
<TD>Thrown when the Java Virtual Machine cannot allocate an object 
 because it is out of memory, and no more memory could be made 
 available by the garbage collector.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="StackOverflowError.html">StackOverflowError</A></B></TD>
<TD>Thrown when a stack overflow occurs because an application 
 recurses too deeply.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="ThreadDeath.html">ThreadDeath</A></B></TD>
<TD>An instance of <code>ThreadDeath</code> is thrown in the victim 
 thread when the <code>stop</code> method with zero arguments in 
 class <code>Thread</code> is called.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="UnknownError.html">UnknownError</A></B></TD>
<TD>Thrown when an unknown but serious exception has occurred in the 
 Java Virtual Machine.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="UnsatisfiedLinkError.html">UnsatisfiedLinkError</A></B></TD>
<TD>Thrown if the Java Virtual Machine cannot find an appropriate 
 native-language definition of a method declared <code>native</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="UnsupportedClassVersionError.html">UnsupportedClassVersionError</A></B></TD>
<TD>Thrown when the Java Virtual Machine attempts to read a class 
 file and determines that the major and minor version numbers
 in the file are not supported.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="VerifyError.html">VerifyError</A></B></TD>
<TD>Thrown when the "verifier" detects that a class file, 
 though well formed, contains some sort of internal inconsistency 
 or security problem.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="VirtualMachineError.html">VirtualMachineError</A></B></TD>
<TD>Thrown to indicate that the Java Virtual Machine is broken or has 
 run out of resources necessary for it to continue operating.</TD>
</TR>
</TABLE>
&nbsp;

<P>
<A NAME="package_description"><!-- --></A><H2>
Package java.lang Description
</H2>

<P>
Provides classes that are fundamental to the design of the Java
programming language. The most important classes are <code>Object</code>,
which is the root of the class hierarchy, and <code>Class</code>, instances of
which represent classes at run time.
<p>
Frequently it is necessary to represent a value of primitive type as
if it were an object. The wrapper classes <code>Boolean</code>,
<code>Character</code>, <code>Integer</code>, <code>Long</code>, <code>Float</code>, and
<code>Double</code> serve this purpose. An object of type <code>Double</code>,
for example, contains a field whose type is double, representing that
value in such a way that a reference to it can be stored in a variable
of reference type. These classes also provide a number of methods for
converting among primitive values, as well as supporting such
standard methods as equals and hashCode.  The <code>Void</code> class is a
non-instantiable class that holds a reference to a <code>Class</code> object
represening the primitive type void.
<p>
The class <code>Math</code> provides commonly used mathematical functions such
as sine, cosine, and square root. The classes <code>String</code> and
<code>StringBuffer</code> similarly provide commonly used operations on
character strings.
<p>
Classes <code>ClassLoader</code>, <code>Process</code>, <code>Runtime</code>,
<code>SecurityManager</code>, and <code>System</code> provide "system operations"
that manage the dynamic loading of classes, creation of external processes,
host environment inquiries such as the time of day, and enforcement of
security policies.
<p>
Class <code>Throwable</code> encompasses objects that may be thrown by the
throw statement (&sect;14.16). Subclasses of <code>Throwable</code> represent errors
and exceptions.
<p>
<h2>Package Specification</h2>


<a name="charenc"></a>
<h3>Character Encodings</h3>

Various constructors and methods in the <A HREF="../../java/lang/package-summary.html">java.lang</A> and <A HREF="../../java/io/package-summary.html">java.io</A>
packages accept string arguments that specify the character encoding to be used
when converting between raw eight-bit bytes and sixteen-bit Unicode characters.
Such encodings are named by strings composed of the following characters:

<ul>

  <li> The uppercase letters <tt>'A'</tt> through <tt>'Z'</tt>
       (<tt>'&#92;u0041'</tt>&nbsp;through&nbsp;<tt>'&#92;u005a'</tt>),

  <li> The lowercase letters <tt>'a'</tt> through <tt>'z'</tt>
       (<tt>'&#92;u0061'</tt>&nbsp;through&nbsp;<tt>'&#92;u007a'</tt>),

  <li> The digits <tt>'0'</tt> through <tt>'9'</tt>
       (<tt>'&#92;u0030'</tt>&nbsp;through&nbsp;<tt>'&#92;u0039'</tt>),

  <li> The dash character <tt>'-'</tt>
       (<tt>'&#92;u002d'</tt>,&nbsp;<small>HYPHEN-MINUS</small>),

  <li> The colon character <tt>':'</tt>
       (<tt>'&#92;u003a'</tt>,&nbsp;<small>COLON</small>), and

  <li> The underscore character <tt>'_'</tt>
       (<tt>'&#92;u005f'</tt>,&nbsp;<small>LOW&nbsp;LINE</small>).

</ul>

An encoding name must begin with either a letter or a digit.  The empty string
is not a legal encoding name.

<p> An encoding may have more than one name.  One of an encoding's names is
considered to be its <i>canonical name</i>.  The canonical name of an encoding
is the name returned by the <tt>getEncoding</tt> methods of the <A HREF="../../java/io/InputStreamReader.html#getEncoding()"><CODE>InputStreamReader</CODE></A> and <A HREF="../../java/io/OutputStreamWriter.html#getEncoding()"><CODE>OutputStreamWriter</CODE></A> classes.

<p> Encoding names generally follow the conventions documented in <a
href="http://ietf.org/rfc/rfc2278.txt"><i>RFC2278:&nbsp;IANA Charset
Registration Procedures</i></a>.  If an encoding listed in the <a
href="ftp://ftp.isi.edu/in-notes/iana/assignments/character-sets">IANA Charset
Registry</a> is supported by an implementation of the Java platform then one of
its names must be the name listed in the registry.  Many encodings are given
more than one name in the registry, in which case the registry identifies one
of the names as <i>MIME-preferred</i>.  An implementation of the Java platform
must support the MIME-preferred registry name for a supported encoding if there
is one; for convenience it may additionally support other registry names.  The
IANA MIME-preferred name of an encoding, if there is one, is often, but not
necessarily, its canonical name.  Following IANA convention, the mapping from
IANA registry names to encodings is not case-sensitive.

<p> Every implementation of the Java platform is required to support the
following character encodings.  Consult the release documentation for your
implementation to see if any other encodings are supported.

<blockquote><table width="80%">
<tr><td valign=top><tt>US-ASCII</tt></td>
    <td>Seven-bit ASCII, a.k.a. <tt>ISO646-US</tt>,
        a.k.a. the Basic Latin block of the Unicode character set</td></tr>
<tr><td valign=top><tt>ISO-8859-1&nbsp;&nbsp;</tt></td>
    <td>ISO Latin Alphabet No. 1, a.k.a. <tt>ISO-LATIN-1</tt></td></tr>
<tr><td valign=top><tt>UTF-8</tt></td>
    <td>Eight-bit Unicode Transformation Format</td></tr>
<tr><td valign=top><tt>UTF-16BE</tt></td>
    <td>Sixteen-bit Unicode Transformation Format,
        big-endian byte&nbsp;order</td></tr>
<tr><td valign=top><tt>UTF-16LE</tt></td>
    <td>Sixteen-bit Unicode Transformation Format,
        little-endian byte&nbsp;order</td></tr>
<tr><td valign=top><tt>UTF-16</tt></td>
    <td>Sixteen-bit Unicode Transformation Format,
        byte&nbsp;order specified by a mandatory initial byte-order mark
	(either order accepted on input, big-endian used on output)</td></tr>
</table></blockquote>

The various Unicode Transformation Formats are described in detail in <a
href="http://www.unicode.org/unicode/standard/standard.html"><i>The Unicode
Standard</i></a> and in the <a
href="http://www.unicode.org/unicode/faq"><i>Unicode FAQ</i></a>.

<p> Every instance of the Java virtual machine has a default character
encoding.  The default encoding is determined during virtual-machine startup
and typically depends upon the locale and encoding being used by the underlying
operating system.


<!--
<ul>
  <li><a href="">##### REFER TO ANY FRAMEMAKER SPECIFICATION HERE #####</a>
</ul>

<h2>Related Documentation</h2>

For overviews, tutorials, examples, guides, and tool documentation, please see:
<ul>
  <li><a href="">##### REFER TO NON-SPEC DOCUMENTATION HERE #####</a>
</ul>
-->
<P>
<DL>
<DT><B>Since: </B><DD>JDK1.0</DD>
</DL>
<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="#FFFFFF" CLASS="NavBarCell1Rev"> &nbsp;<FONT CLASS="NavBarFont1Rev"><B>Package</B></FONT>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <FONT CLASS="NavBarFont1">Class</FONT>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-use.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/io/package-summary.html"><B>PREV PACKAGE</B></A>&nbsp;
&nbsp;<A HREF="../../java/lang/ref/package-summary.html"><B>NEXT PACKAGE</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="package-summary.html" TARGET="_top"><B>NO FRAMES</B></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>