version.html

jdbc书

    Use the <CODE>-sysclasspath</CODE> option to force the Java VM to 
    use the <CODE>CLASSPATH</CODE> supplied on the command line only:
    <CODE>java -sysclasspath c:\java\lib\classes.zip;. myapp</CODE>
    </FONT>
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        <TH ALIGN=LEFT><FONT FACE="Verdana, Arial, Helvetica, sans-serif">Product</FONT></TH>
        <TH><FONT FACE="Verdana, Arial, Helvetica, sans-serif">Deployment</FONT></TH>
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<TR>
  <TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
	Java 2 Platform</FONT>
  </TD>
  <TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
    The platform is split into a Java Runtime Environment (JRE) and Java compiler.
    The JRE is included as a subdirectory in the release, and the traditional
    <CODE>java</CODE> and <CODE>javac</CODE> programs in the <CODE>bin</CODE>
     directory invoke the real program in the <CODE>jre/bin</CODE> directory. 
     The separate <CODE>jre</CODE> launcher is no longer provided, and
    the java program is solely used instead.
<P>
    The Java ARchive (JAR) files containing the core Java platform system 
    classes, <CODE>rt.jar</CODE> and <CODE>i18.jar</CODE>,
    are located in the <CODE>jre/lib</CODE> directory with a relative search path.
<P>
   <STRONG>Side Effects:</STRONG>
<BR>
    If applications previously used the <CODE>classes.zip</CODE>
    file to load the core Java platform systems, they might still try 
    to load an additional set of classes in error.
<P>
    <STRONG>Diagnostics:</STRONG>
<BR>
    Use the <CODE>-Xbootclasspath</CODE> option to force the Java VM to use 
    the <CODE>CLASSPATH</CODE> supplied on the command line only:
    <CODE>java -Xbootclasspath:c:\java\jre\lib\rt.jar;<BR>
    c:\java\jre\lib\i18n.jar;. myapp</CODE>
<P>
    You might need to supply this as a runtime option as follows:
    <CODE>javac -J-Xbootclasspath:c\java\lib\tools.jar;c:<BR>
    \java\jre\lib\rt.jar;c:\java\jre\lib\i18n.jar;. myapp.java</CODE>
    </FONT>
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        <TH ALIGN=LEFT><FONT FACE="Verdana, Arial, Helvetica, sans-serif">Product</FONT></TH>
        <TH><FONT FACE="Verdana, Arial, Helvetica, sans-serif">Deployment</FONT></TH>
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  <TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
	Java Plug-In</FONT>
  </TD>
  <TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
    On Windows 95 and Windows NT uses the registry
    to find installed plug-in Java platform releases.
<P>
   <STRONG>Side Effects:</STRONG>
<BR>
    Registry can become corrupted, or plug-in removed physically but
    not from the registry.
<P>
    <STRONG>Diagnostics:</STRONG>
<BR>
    Display the <CODE>java.version</CODE> and <CODE>java.class.path</CODE>
    property in your code and display it on the Java Plug-in Console

</FONT>

<PRE>
System.out.println("version="+System.getProperty(
  "java.version"
  ));
System.out.println("class path="+System.getProperty(
  "java.class.path"
  ));
</PRE>

<FONT FACE="Verdana, Arial, Helvetica, sans-serif">
   
    If there is a conflict, check the registry with the <CODE>regedit</CODE>
    command, search for the word <EM>VM</EM> and if it exists,
     delete it and reinstall the plug-in
     </FONT>
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<TR>
        <TH ALIGN=LEFT><FONT FACE="Verdana, Arial, Helvetica, sans-serif">Product</FONT></TH>
        <TH><FONT FACE="Verdana, Arial, Helvetica, sans-serif">Deployment</FONT></TH>
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<TR>
  <TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
    Netscape</FONT>
  </TD>
  <TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
    Uses <CODE>.jar</CODE> files such as <CODE>java40.jar</CODE>
    in <CODE>netscape</CODE> directory.
<P>
   <STRONG>Side Effects:</STRONG>
<BR>
    Not all Netscape releases are fully JDK 1.1 compliant. You can get
    upgrade patches at 
    <A HREF="http://www.netscape.com">http://www.netscape.com</A>.
<P>
   <STRONG>Diagnostics:</STRONG>
<BR>
    Start the browser on the command line with the <CODE>-classes</CODE> 
    option.
    </FONT>
  </TD>
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<TR>
        <TH ALIGN=LEFT><FONT FACE="Verdana, Arial, Helvetica, sans-serif">Product</FONT></TH>
        <TH><FONT FACE="Verdana, Arial, Helvetica, sans-serif">Deployment</FONT></TH>
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<TR>
  <TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
    Internet<BR>Explorer</FONT>
  </TD>
  
  <TD VALIGN="TOP"><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
    Uses <CODE>.cab</CODE> files to contain system classes. 
    Also uses system registry on Windows 95/NT.
<P>
   <STRONG>Side Effects:</STRONG>
<BR>
    Use the <CODE>regedit</CODE> command to search for the word
    <EM>VM</EM>. There is a 
    <CODE>CLASSPATH</CODE> entry to which you can add your own classes.

 <P>
   <STRONG>Diagnostics:</STRONG>
<BR>
    The registry can become corrupted. Search for CLASSPATH using the regedit
    program and edit the value that CLASSPATH points to.
    </FONT>
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