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cation data, such as user names and passwords, or to display certain information, such as error and warning messages CallbackHandler interfaces are implemented in an application-dependent fashion For example, implementations for an application with a graphical user interface (GUI) may pop up windows to prompt for requested information or to display error messages An implementation may also choose to obtain requested information from an alternate source without asking the end user Underlying security services make requests for different types of information by passing individual Callback objects to the CallbackHandler The CallbackHandler implementation decides how to retrieve and display information depending on the Callback objects passed to it For example, if the underlying service needs a user name and password to authenticate a user, it uses a NameCallback and PasswordCallback The CallbackHandler can then choose to prompt for a user name and password serially, or to prompt for both in a single window A class that implemented CallbackHandler with support for several different Callback types in a command-line application environment could look like this:

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s[4:11] s[-3:]

or by using a single-type-import declaration ( 751) that mentions the fully quali ed name, so that the simple name may be used thereafter:

class SampleCallbackHandler implements CallbackHandler { SampleCallbackHandler( String userName ) { _userName = userName; } /** * Invoke the requested Callback */ public void invokeCallback(Callback[] callbacks) throws javaioIOException, UnsupportedCallbackException { for (int i = 0; i < callbackslength; i++) { if (callbacks[i] instanceof TextOutputCallback) { // display the message according to the specified STYLE TextOutputCallback toc = (TextOutputCallback)callbacks[i]; switch (tocgetStyle()) { case TextOutputCallbackERROR: Systemoutprintln("ERROR: " + tocgetMessage()); break; case TextOutputCallbackINFORMATION: Systemoutprintln(tocgetMessage()); break; case TextOutputCallbackWARNING: Systemoutprintln("WARNING: " + tocgetMessage()); break; }

:: 7 s[:7]

package pointsUser; import pointsPoint; class Test { public static void main(String[] args) { Point p = new Point(); Systemoutprintln(px + " " + py); }}

s[7:]

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} else if (callbacks[i] instanceof TextInputCallback) { // prompt the user for information TextInputCallback tic = (TextInputCallback)callbacks[i]; // display the prompt like this: // prompt [default_reply]: Systemerrprint(ticgetPrompt() + " [" + ticgetDefaultText() + "]: "); Systemerrflush(); BufferedReader reader = new BufferedReader( new InputStreamReader(Systemin)); ticsetText(readerreadLine()); } else if (callbacks[i] instanceof NameCallback) { ((NameCallback)callbacks[i])setName( _userName ); } else if (callbacks[i] instanceof PasswordCallback) { // prompt the user for sensitive information PasswordCallback pc = (PasswordCallback)callbacks[i]; Systemerrprint(pcgetPrompt() + " "); Systemerrflush(); pcsetPassword(readPassword(Systemin)); } else if (callbacks[i] instanceof LanguageCallback) { // get the language from the locale LanguageCallback lc = (LanguageCallback)callbacks[i]; lcsetLocale( LocalegetDefault() ); } else { throw new UnsupportedCallbackException (callbacks[i], "Unrecognized Callback"); } } } /** * Reads user password from given input stream */ private char[] readPassword(InputStream in) { // insert code to read a user password from the input stream } private String _userName = null; }

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However, this compilation unit cannot use or import pointsPointList, which is not declared public and is therefore inaccessible outside package points 665 Example: Default-Access Fields, Methods, and Constructors If none of the access modi ers public, protected, or private are speci ed, a class member or constructor is accessible throughout the package that contains the declaration of the class in which the class member is declared, but the class member or constructor is not accessible in any other package If a public class has a method or constructor with default access, then this method or constructor is not accessible to or inherited by a subclass declared outside this package For example, if we have:

One way of inserting a substring inside a string is to mix slicing with concatenation For example:

package points; public class Point { public int x, y; void move(int dx, int dy) { x += dx; y += dy; } public void moveAlso(int dx, int dy) { move(dx, dy); } } then a subclass in another package may declare an unrelated move method, with the same signature ( 842) and return type Because the original move method is not accessible from package morepoints, super may not be used: package morepoints; public class PlusPoint extends pointsPoint { public void move(int dx, int dy) { supermove(dx, dy); // compile-time error moveAlso(dx, dy); } } Because move of Point is not overridden by move in PlusPoint, the method moveAlso in Point never calls the method move in PlusPoint Thus if you delete the supermove call from PlusPoint and execute the test

An Internet Draft proposes a standard Java API for SASL clients and servers to use and register mechanisms, and there is an identical proposal to Sun s Java Community

>>> s = s[:12] + "wo" + s[12:] >>> s 'The waxwork woman'

program: }

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