urlclassloader.html

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<A NAME="findClass(java.lang.String)"><!-- --></A><H3>
findClass</H3>
<PRE>
protected <A HREF="../../java/lang/Class.html">Class</A> <B>findClass</B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;name)
                   throws <A HREF="../../java/lang/ClassNotFoundException.html">ClassNotFoundException</A></PRE>
<DL>
<DD>Finds and loads the class with the specified name from the URL search
 path. Any URLs referring to JAR files are loaded and opened as needed
 until the class is found.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/lang/ClassLoader.html#findClass(java.lang.String)">findClass</A></CODE> in class <CODE><A HREF="../../java/lang/ClassLoader.html">ClassLoader</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - the name of the class<DT><B>Returns:</B><DD>the resulting class<DT><B>Throws:</B><DD><CODE><A HREF="../../java/lang/ClassNotFoundException.html">ClassNotFoundException</A></CODE> - if the class could not be found</DL>
</DD>
</DL>
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<A NAME="definePackage(java.lang.String, java.util.jar.Manifest, java.net.URL)"><!-- --></A><H3>
definePackage</H3>
<PRE>
protected <A HREF="../../java/lang/Package.html">Package</A> <B>definePackage</B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;name,
                                <A HREF="../../java/util/jar/Manifest.html">Manifest</A>&nbsp;man,
                                <A HREF="../../java/net/URL.html">URL</A>&nbsp;url)
                         throws <A HREF="../../java/lang/IllegalArgumentException.html">IllegalArgumentException</A></PRE>
<DL>
<DD>Defines a new package by name in this ClassLoader. The attributes
 contained in the specified Manifest will be used to obtain package
 version and sealing information. For sealed packages, the additional
 URL specifies the code source URL from which the package was loaded.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - the package name<DD><CODE>man</CODE> - the Manifest containing package version and sealing
              information<DD><CODE>url</CODE> - the code source url for the package, or null if none<DT><B>Returns:</B><DD>the newly defined Package object<DT><B>Throws:</B><DD><CODE><A HREF="../../java/lang/IllegalArgumentException.html">IllegalArgumentException</A></CODE> - if the package name duplicates
              an existing package either in this class loader or one
              of its ancestors</DL>
</DD>
</DL>
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<A NAME="findResource(java.lang.String)"><!-- --></A><H3>
findResource</H3>
<PRE>
public <A HREF="../../java/net/URL.html">URL</A> <B>findResource</B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;name)</PRE>
<DL>
<DD>Finds the resource with the specified name on the URL search path.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/lang/ClassLoader.html#findResource(java.lang.String)">findResource</A></CODE> in class <CODE><A HREF="../../java/lang/ClassLoader.html">ClassLoader</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - the name of the resource<DT><B>Returns:</B><DD>a <code>URL</code> for the resource, or <code>null</code> 
 if the resource could not be found.</DL>
</DD>
</DL>
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<A NAME="findResources(java.lang.String)"><!-- --></A><H3>
findResources</H3>
<PRE>
public <A HREF="../../java/util/Enumeration.html">Enumeration</A> <B>findResources</B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;name)
                          throws <A HREF="../../java/io/IOException.html">IOException</A></PRE>
<DL>
<DD>Returns an Enumeration of URLs representing all of the resources
 on the URL search path having the specified name.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/lang/ClassLoader.html#findResources(java.lang.String)">findResources</A></CODE> in class <CODE><A HREF="../../java/lang/ClassLoader.html">ClassLoader</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - the resource name<DT><B>Returns:</B><DD>an <code>Enumeration</code> of <code>URL</code>s<DT><B>Throws:</B><DD><CODE>if</CODE> - an I/O exception occurs</DL>
</DD>
</DL>
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<A NAME="getPermissions(java.security.CodeSource)"><!-- --></A><H3>
getPermissions</H3>
<PRE>
protected <A HREF="../../java/security/PermissionCollection.html">PermissionCollection</A> <B>getPermissions</B>(<A HREF="../../java/security/CodeSource.html">CodeSource</A>&nbsp;codesource)</PRE>
<DL>
<DD>Returns the permissions for the given codesource object.
 The implementation of this method first calls super.getPermissions,
 to get the permissions
 granted by the policy, and then adds additional permissions
 based on the URL of the codesource.
 <p>
 If the protocol is "file"
 and the path specifies a file, then permission to read that
 file is granted. If protocol is "file" and the path is
 a directory, permission is granted to read all files
 and (recursively) all files and subdirectories contained in
 that directory.
 <p>
 If the protocol is not "file", then
 to connect to and accept connections from the URL's host is granted.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/security/SecureClassLoader.html#getPermissions(java.security.CodeSource)">getPermissions</A></CODE> in class <CODE><A HREF="../../java/security/SecureClassLoader.html">SecureClassLoader</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>codesource</CODE> - the codesource<DT><B>Returns:</B><DD>the permissions granted to the codesource</DL>
</DD>
</DL>
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<A NAME="newInstance(java.net.URL[], java.lang.ClassLoader)"><!-- --></A><H3>
newInstance</H3>
<PRE>
public static <A HREF="../../java/net/URLClassLoader.html">URLClassLoader</A> <B>newInstance</B>(<A HREF="../../java/net/URL.html">URL</A>[]&nbsp;urls,
                                         <A HREF="../../java/lang/ClassLoader.html">ClassLoader</A>&nbsp;parent)</PRE>
<DL>
<DD>Creates a new instance of URLClassLoader for the specified
 URLs and parent class loader. If a security manager is
 installed, the <code>loadClass</code> method of the URLClassLoader
 returned by this method will invoke the
 <code>SecurityManager.checkPackageAccess</code> method before
 loading the class.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>urls</CODE> - the URLs to search for classes and resources<DD><CODE>parent</CODE> - the parent class loader for delegation<DT><B>Returns:</B><DD>the resulting class loader</DL>
</DD>
</DL>
<HR>

<A NAME="newInstance(java.net.URL[])"><!-- --></A><H3>
newInstance</H3>
<PRE>
public static <A HREF="../../java/net/URLClassLoader.html">URLClassLoader</A> <B>newInstance</B>(<A HREF="../../java/net/URL.html">URL</A>[]&nbsp;urls)</PRE>
<DL>
<DD>Creates a new instance of URLClassLoader for the specified
 URLs and default parent class loader. If a security manager is
 installed, the <code>loadClass</code> method of the URLClassLoader
 returned by this method will invoke the
 <code>SecurityManager.checkPackageAccess</code> before
 loading the class.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>urls</CODE> - the URLs to search for classes and resources<DT><B>Returns:</B><DD>the resulting class loader</DL>
</DD>
</DL>
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