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<TITLE>Writing Advanced Applications, Appendix B: Classes, Methods, & Permissions</TITLE>
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<H2>Writing Advanced Applications<BR>
<FONT SIZE="3">Appendix B: Classes, Methods, and Permissions</FONT></H2>
<FONT SIZE="-1">[<A HREF="appA.html"><<BACK</A>] [<A HREF="index.html#contents">CONTENTS</A>] [<A HREF="appC.html">NEXT>></A>]</FONT></DIV>
<P>
A number of Java<FONT SIZE="-2"><SUP>TM</SUP></FONT> 2 platform
methods are implemented to verify access permissions. This means
that before they execute, they verify that there is a
<A HREF="signed.html#policy">system, user, or program</A>
has a policy file with the required permissions for
execution to continue. If no such permission is found, execution
stops with an error condition.
<P>
The access verification code passes the required permissions to the
<A HREF="signed2.html">security manager</A>, and the security manager
checks that permission against the policy file permissions to determine
whether to access. This means that Java 2 platform API methods are associated
with specific permissions, and specific permissions are associated with specific
<CODE>java.security.SecurityManager</CODE> methods.
<P>
This appendix lists the Java 2 platform methods, the permission associated
with each method, and the <CODE>java.security.SecurityManager</CODE>
method called to verify the existence of that permission. You need this information
when you implement certain abstract methods or create your own
<A HREF="signed2.html">security manager</A> so you can include access
verification code to keep your implementations in line with Java 2 platform
security policy. If you do not include access verification code, your
implementations will bypass the built-in Java 2 platform security checks.
<P>
<UL>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#2D">java.awt.Graphics2D</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#toolkit">java.awt.ToolKit</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#window">java.awt.Window</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#beans">java.beans.Beans</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#introspector">java.beans.Introspector</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#propedit">java.beans.PropertyEditorManager</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#file">java.io.File</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#fileout">java.io.FileOutputStream</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#objin">java.io.ObjectInputStream</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#objout">java.io.ObjectOutputStream</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#raf">java.io.RandomAccessFile</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#class">java.lang.Class</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#classload">java.lang.ClassLoader</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#runtime">java.lang.Runtime</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#secmgr">java.lang.SecurityManager</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#system">java.lang.System</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#thrd">java.lang.Thread</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#thrdgrp">java.lang.ThreadGroup</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#accobj">java.lang.reflect.AccessibleObject</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#auth">java.net.Authenticator</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#auth">java.net.DatagramSocket</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#http">java.net.HttpURLConnection</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#inet">java.net.InetAddress</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#mulsoc">java.net.MulticastSocket</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#servsoc">java.net.ServerSocket</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#socket">java.net.Socket</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#url">java.net.URL</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#urlcon">java.net.URLConnection</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#urlload">java.net.URLClassLoader</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#actgrp">java.rmi.activation.ActivationGroup</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#rmi">java.rmi.server.RMISocketFactory</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#ident">java.security.Identity</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#iscope">java.security.IdentityScope</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#perm">java.security.Permission</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#pol">java.security.Policy</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#prov">java.security.Provider</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#secload">java.security.SecureClassLoader</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#sec">java.security.Security</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#sign">java.security.Signer</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#locale">java.util.Locale</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#zip">java.util.Zip</A></FONT>
</UL>
<HR>
<A NAME="2D"></A>
<H3>java.awt.Graphics2D</H3>
</FONT>
<PRE>
public abstract void setComposite(Composite comp)
java.Security.SecurityManager.checkPermission
java.awt.AWTPermission "readDisplayPixels"
</PRE>
<FONT FACE="Verdana, Arial, Helvetica, sans-serif">
The access verification code for setComposite should call
java.Security.SecurityManager.checkPermission and pass it
java.awt.AWTPermission "readDisplayPixels" when a Graphics2D
context draws to a Component on the display screen and the
Composite is a custom object rather than an AlphaComposite object.
<A NAME="toolkit"></A>
<H3>java.awt.Toolkit</H3>
</FONT>
<PRE>
public void addAWTEventListener(
AWTEventListener listener,
long eventMask)
public void removeAWTEventListener(
AWTEventListener listener)
checkPermission
java.awt.AWTPermission "listenToAllAWTEvents"
</PRE>
<FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<DIV ALIGN=LEFT>~~~~~~~~~</DIV>
</FONT
><PRE>
public abstract PrintJob getPrintJob(
Frame frame, String jobtitle,
Properties props)
checkPrintJobAccess
java.lang.RuntimePermission "queuePrintJob"
</PRE>
<FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<DIV ALIGN=LEFT>~~~~~~~~~</DIV>
</FONT>
<PRE>
public abstract Clipboard
getSystemClipboard()
checkSystemClipboardAccess
java.awt.AWTPermission "accessClipboard"
</PRE>
<FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<DIV ALIGN=LEFT>~~~~~~~~~</DIV>
</FONT>
<PRE>
public final EventQueue
getSystemEventQueue()
checkAwtEventQueueAccess
java.awt.AWTPermission "accessEventQueue"
</PRE>
<FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A NAME="window"></A>
<H3>java.awt.Window</H3>
</FONT>
<PRE>
Window()
checkTopLevelWindow
java.awt.AWTPermission
"showWindowWithoutWarningBanner"
</PRE>
<FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A NAME="beans"></A>
<H3>java.beans.Beans</H3>
</FONT>
<PRE>
public static void setDesignTime(
boolean isDesignTime)
public static void setGuiAvailable(
boolean isGuiAvailable)
checkPropertiesAccess
java.util.PropertyPermissions "*", "read,write"
</PRE>
<FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A NAME="introspector"></A>
<H3>java.beans.Introspector</H3>
</FONT>
<PRE>
public static synchronized void
setBeanInfoSearchPath(String path[])
checkPropertiesAccess
java.util.PropertyPermissions "*", "read,write"
</PRE>
<FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A NAME="propedit"></A>
<H3>java.beans.PropertyEditorManager</H3>
</FONT>
<PRE>
public static void registerEditor(
Class targetType,
Class editorClass)
public static synchronized void
setEditorSearchPath(String path[])
checkPropertiesAccess
java.util.PropertyPermissions "*", "read,write"
</PRE>
<FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A NAME="file"></A>
<H3>java.io.File</H3>
</FONT>
<PRE>
public boolean delete()
public void deleteOnExit()
checkDelete(String)
java.io.FilePermission "{name}", "delete"
</PRE>
<FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<DIV ALIGN=LEFT>~~~~~~~~~</DIV>
</FONT>
<PRE>
public boolean exists()
public boolean canRead()
public boolean isFile()
public boolean isDirectory()
public boolean isHidden()
public long lastModified()
public long length()
public String[] list()
public String[] list(FilenameFilter filter)
public File[] listFiles()
public File[] listFiles(FilenameFilter filter)
public File[] listFiles(FileFilter filter)
checkRead(String)
java.io.FilePermission "{name}", "read"
</PRE>
<FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<DIV ALIGN=LEFT>~~~~~~~~~</DIV>
</FONT>
<PRE>
public boolean canWrite()
public boolean createNewFile()
public static File createTempFile(
String prefix, String suffix)
public static File createTempFile(
String prefix, String suffix,
File directory)
public boolean mkdir()
public boolean mkdirs()
public boolean renameTo(File dest)
public boolean setLastModified(long time)
public boolean setReadOnly()
checkWrite(String)
java.io.FilePermission "{name}", "write"
</PRE>
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