Demonstrates the use of a JColorChooser which presents a dialog with three different tabbed panes to allow the user to select a color preference. The dialog returns a Color object based on the user’s selection or null if the user entered Cancel. import java.awt.*; import java.awt.event.*; import javax.swing.*; /** Simple example illustrating the use of …
Category: Code . Programming Samples . প্রোগ্রাম উদাহরন
Code . Programming Samples . প্রোগ্রাম উদাহরন
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WebClient – Client application that can talk interactively to Web servers. Requires the components listed below
import java.awt.*; // For BorderLayout, GridLayout, Font, Color. import java.awt.event.*; import java.util.*; import javax.swing.*; /** A graphical client that lets you interactively connect to * Web servers and send custom request lines and * request headers. * * Taken from Core Web Programming from * Prentice Hall and Sun Microsystems Press, * . * © …
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EchoServer.java A simple HTTP server that creates a Web page showing all data sent from the client (browser), including all HTTP request headers sent form the client. Uses the following classes
EchoServer.java A simple HTTP server that creates a Web page showing all data sent from the client (browser), including all HTTP request headers sent form the client. Uses the following classes: import java.net.*; import java.io.*; import java.util.StringTokenizer; /** A simple HTTP server that generates a Web page showing all * of the data that …
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StoppableThread.java A template to place a thread in a RUN, WAIT, or STOP state.
/** A template to control the state of a thread through setting * an internal flag. public class StoppableThread extends Thread { public static final int STOP = 0; public static final int RUN = 1; public static final int WAIT = 2; private int state = RUN; /** Public …
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mall example showing the basic use of a JToolBar
mall example showing the basic use of a JToolBar import java.awt.*; import javax.swing.*; import java.awt.event.*; /** Small example showing basic use of JToolBar. * * */ public class JToolBarExample extends JFrame implements ItemListener { private BrowserToolBar toolbar; private JCheckBox labelBox; public static void main(String[] args) { new JToolBarExample(); } …
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UrlRetriever2.java Illustrates how the URL class can simplify communication to an HTTP server.
UrlRetriever2.java Illustrates how the URL class can simplify communication to an HTTP server. import java.net.*; import java.io.*; /** Read a remote file using the standard URL class * instead of connecting explicitly to the HTTP server. * * Taken from Core Web Programming from * Prentice Hall and Sun Microsystems Press, * . * © …
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RMI Example – Message, illustrates retrieving a message from an object located on a remote server. Requires the following classes
Rem.java Establishes which methods the client can access in the remote object. import java.rmi.*; /** The RMI client will use this interface directly. The RMI * server will make a real remote object that implements this, * then register an instance of it with some URL. * * Taken from Core Web Programming from * …
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Creates three common types of sliders
Creates three common types of sliders: one without tick marks, one with tick marks, and one with both tick marks and labels. import java.awt.*; import javax.swing.*; /** Simple example illustrating the use of JSliders, especially * the ability to specify tick marks and labels. * * */ public class JSliders extends JFrame { …
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Basic Swing Details
WindowUtilities.java Utility class that simplifies creating a window and setting the look and feel. ExitListener.java A WindowListener with support to close the window. JAppletExample.java A simple applet (JApplet) created in Swing. Illustrates setting the look and feel, adding components to the content pane, and changing the layout to FlowLayout (default is BorderLayout). See JAppletExample.html (requires …
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UrlRetriever.java Accepts an URL from the command line, parses the host, port, and URI components from the URL and then retrieves the document. Requires the following classes
UrlRetriever.java Accepts an URL from the command line, parses the host, port, and URI components from the URL and then retrieves the document. Requires the following classes: import java.util.*; /** This parses the input to get a host, port, and file, then * passes these three values to the UriRetriever class to * grab the …
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AddressVerifier.java Connects to an SMTP server and issues a expn request to display details about a mailbox on the server. Uses the following classes
import java.net.*; import java.io.*; /** Given an e-mail address of the form user@host, * connect to port 25 of the host and issue an * ‘expn’ request for the user. Print the results. * * Taken from Core Web Programming from * Prentice Hall and Sun Microsystems Press, * . * © 2001 Marty Hall …
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Buggy Counter Applet.java Demonstrates that data shared by multiple threads is candidate for a potential race condition
import java.applet.Applet; import java.awt.*; /** Emulates the Counter and Counter2 classes, but this time * from an applet that invokes multiple versions of its own run * method. This version is likely to work correctly * except when an important customer is visiting. public class BuggyCounterApplet extends Applet implements Runnable{ private int totalNum …
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SplitTest.java Illustrates parsing a string with a String.split
SplitTest.java Illustrates parsing a string with a String.split /** Prints the tokens resulting from treating the first * command-line argument as the string to be tokenized * and the second as the delimiter set. Uses * String.split instead of StringTokenizer. */ public class SplitTest { public static void main(String[] args) { if (args.length == 2) …
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TokTest.java Illustrates parsing a string with a StringTokenizer.
TokTest.java Illustrates parsing a string with a StringTokenizer. import java.util.StringTokenizer; /** Prints the tokens resulting from treating the first * command-line argument as the string to be tokenized * and the second as the delimiter set. * * Taken from Core Web Programming from * Prentice Hall and Sun Microsystems Press, * . * © …
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NetworkClientTest.java Makes a simple connection to the host and port specified on the command line. Uses the following classes
NetworkClientTest.java Makes a simple connection to the host and port specified on the command line. Uses the following classes: /** Make simple connection to host and port specified. * * Taken from Core Web Programming from * Prentice Hall and Sun Microsystems Press, * . * © 2001 Marty Hall and Larry Brown; * may …
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ShowSession.java Servlet that uses session tracking to determine if the client is a repeat visitor. Uses the ServletUtilities class to simplify the DOCTYPE and HEAD output.
ShowSession.java Servlet that uses session tracking to determine if the client is a repeat visitor. Uses the ServletUtilities class to simplify the DOCTYPE and HEAD output. package cwp; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.net.*; import java.util.*; /** Simple example of session tracking. * * Taken from Core Web Programming Java 2 Edition * …
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LongLivedCookie.java Subclass of Cookie that automatically sets the max age to one year.
LongLivedCookie.java Subclass of Cookie that automatically sets the max age to one year. package cwp; import javax.servlet.http.*; /** Cookie that persists 1 year. Default Cookie doesn’t * persist past current session. * * Taken from Core Web Programming Java 2 Edition * from Prentice Hall and Sun Microsystems Press, * . * May be …
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ShowCookies.java Servlet that displays all cookies that arrived in current request. Uses the ServletUtilities class.
ShowCookies.java Servlet that displays all cookies that arrived in current request. Uses the ServletUtilities class. package cwp; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; /** Sets six cookies: three that apply only to the current * session (regardless of how long that session lasts) * and three that persist for an hour (regardless of * whether …
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SearchEngines.java Servlet that redirects requests to various search engines. Uses the SearchSpec helper class. Accessed by means of SearchEngines.html.
SearchEngines.java Servlet that redirects requests to various search engines. Uses the SearchSpec helper class. Accessed by means of SearchEngines.html. package cwp; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.net.*; /** Servlet that takes a search string, number of results per * page, and a search engine name, sending the query to * that search engine. …
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SetCookies.java Servlet that sets a few persistent and session cookies. Uses the ServletUtilities class to simplify the DOCTYPE and HEAD output.
SetCookies.java Servlet that sets a few persistent and session cookies. Uses the ServletUtilities class to simplify the DOCTYPE and HEAD output. package cwp; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; /** Sets six cookies: three that apply only to the current * session (regardless of how long that session lasts) * and three that persist …
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EncodedPage.java Servlet that shows the bandwidth benefits of gzipping pages to browsers that can handle gzip. Uses the ServletUtilities class to simplify the DOCTYPE and HEAD output.
EncodedPage.java Servlet that shows the bandwidth benefits of gzipping pages to browsers that can handle gzip. Uses the ServletUtilities class to simplify the DOCTYPE and HEAD output. package cwp; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.util.zip.*; /** Example showing benefits of gzipping pages to browsers * that can handle gzip. * * Taken …
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PrimeNumbers.java Servlet that processes a request to generate n prime numbers, each with at least m digits. If these results are not complete, it sends a Refresh header instructing the browser to ask for new results a little while later. Uses the Primes
PrimeNumbers.java Servlet that processes a request to generate n prime numbers, each with at least m digits. If these results are not complete, it sends a Refresh header instructing the browser to ask for new results a little while later. Uses the Primes, PrimeList, and ServletUtilities classes. package cwp; import java.io.*; import javax.servlet.*; import …
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ShowRequestHeaders.java Servlet that shows all request headers sent by browser in current request.
ShowRequestHeaders.java Servlet that shows all request headers sent by browser in current request. package cwp; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.util.*; /** Shows all the request headers sent on this request. * * Taken from Core Web Programming Java 2 Edition * from Prentice Hall and Sun Microsystems Press, * . * May …
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ServletUtilities.java Utility class that, among other things, contains the static filter method that replaces special HTML characters with their HTML character entities.
ServletUtilities.java Utility class that, among other things, contains the static filter method that replaces special HTML characters with their HTML character entities. package cwp; import javax.servlet.*; import javax.servlet.http.*; /** Some simple time savers. Note that most are static methods. * * Taken from Core Web Programming Java 2 Edition * from Prentice Hall and …
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ThreeParams.java Servlet that reads and displays three request (form) parameters. Uses the ServletUtilities class.
ThreeParams.java Servlet that reads and displays three request (form) parameters. Uses the ServletUtilities class. package cwp; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; /** Simple servlet that reads three parameters from the * form data. * * Taken from Core Web Programming Java 2 Edition * from Prentice Hall and Sun Microsystems Press, * . …
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ShowMessage.java Servlet that demonstrates the use of initialization parameters.
ShowMessage.java Servlet that demonstrates the use of initialization parameters. Remember that, to use this servlet, you have to do three things: * Put the modified web.xml file in the WEB-INF directory. * Restart the server. * Use the registered servlet name (i.e., the URL http://host/servlet/ShowMsg), not the raw servlet name (i.e., the …
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ServletUtilities.java Utility class that simplifies the output of the DOCTYPE and HEAD in servlets, among other things. Used by most remaining servlets in the chapter.
ServletUtilities.java Utility class that simplifies the output of the DOCTYPE and HEAD in servlets, among other things. Used by most remaining servlets in the chapter. package cwp; import javax.servlet.*; import javax.servlet.http.*; /** Some simple time savers. Note that most are static methods. * * Taken from Core Web Programming Java 2 Edition * from …
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SimplerHelloWWW.java Servlet that uses ServletUtilities to simplify the generation of the DOCTYPE and HEAD part of the servlet.
SimplerHelloWWW.java Servlet that uses ServletUtilities to simplify the generation of the DOCTYPE and HEAD part of the servlet. package cwp; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; /** Simple servlet that generates HTML. This variation of * HelloWWW uses the ServletUtilities utility class * to generate the DOCTYPE, HEAD, and TITLE. * * Taken from …
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HelloWWW.java Servlet that generates HTML. This and all remaining servlets are in the cwp package and therefore should be installed in the cwp subdirectory.
HelloWWW.java Servlet that generates HTML. This and all remaining servlets are in the cwp package and therefore should be installed in the cwp subdirectory. package cwp; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; /** Simple servlet that generates HTML. * * Taken from Core Web Programming Java 2 Edition * from Prentice Hall and Sun …
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HelloWorld.java Simple servlet that generates plain text.
HelloWorld.java Simple servlet that generates plain text. import java.io.*; import javax.servlet.*; import javax.servlet.http.*; /** Very simplistic servlet that generates plain text. * * Taken from Core Web Programming Java 2 Edition * from Prentice Hall and Sun Microsystems Press, * . * May be freely used or adapted. */ public class HelloWorld extends HttpServlet …
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ServletTemplate.java Starting point for servlets.
ServletTemplate.java Starting point for servlets. import java.io.*; import javax.servlet.*; import javax.servlet.http.*; /** Servlet template. * * Taken from Core Web Programming Java 2 Edition * from Prentice Hall and Sun Microsystems Press, * . * May be freely used or adapted. */ public class ServletTemplate extends HttpServlet { public void doGet(HttpServletRequest request, …
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StringBean.java Bean used to demonstrate jsp:useBean, etc. Remember to install it in the WEB-INF/classes/cwp directory.
StringBean.java Bean used to demonstrate jsp:useBean, etc. Remember to install it in the WEB-INF/classes/cwp directory. package cwp; /** A simple bean that has a single String property * called message. * <P> * Taken from Core Web Programming Java 2 Edition * from Prentice Hall and Sun Microsystems Press, * . * May be freely …
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PluginApplet.jsp Page that demonstrates the use of jsp:plugin.
PluginApplet.jsp Page that demonstrates the use of jsp:plugin. Requires you to compile and install PluginApplet.java, TextPanel.java, DrawingPanel.java, and WindowUtilities.java Since these are classes sent to the client to used by applets, the .class files should be in the same directory as the JSP page, not in the WEB-INF/classes directory where classes the server uses go. …
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BGColor.jsp Page that demonstrates JSP scriptlets. Uses the JSP-Styles style sheet.
BGColor.jsp Page that demonstrates JSP scriptlets. Uses the JSP-Styles style sheet. <!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.0 Transitional//EN”> <!– Taken from Core Web Programming Java 2 Edition from Prentice Hall and Sun Microsystems Press, . May be freely used or adapted. –> <HTML> <HEAD> <TITLE>Color Testing</TITLE> </HEAD> <% String bgColor = request.getParameter(“bgColor”); boolean …
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Excel.jsp Page that demonstrates the use of JSP to build Excel spreadsheets
Excel.jsp Page that demonstrates the use of JSP to build Excel spreadsheets First Last Email Address Marty Hall hall@corewebprogramming.com Larry Brown brown@corewebprogramming.com Bill Gates gates@sun.com Larry Ellison ellison@microsoft.com <%@ page contentType=”application/vnd.ms-excel” %> <%– There are tabs, not spaces, between columns. –%>
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Expressions.jsp Page that demonstrates JSP expressions. Uses the JSP-Styles style sheet.
Expressions.jsp Page that demonstrates JSP expressions. Uses the JSP-Styles style sheet. <!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.0 Transitional//EN”> <!– Example of JSP Expressions. Taken from Core Web Programming Java 2 Edition from Prentice Hall and Sun Microsystems Press, . May be freely used or adapted. –> <HTML> <HEAD> <TITLE>JSP Expressions</TITLE> <META NAME=”keywords” …
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ImportAttribute.jsp Page that demonstrates the import attribute of the page directive. Uses the ServletUtilities class
ImportAttribute.jsp Page that demonstrates the import attribute of the page directive. Uses the ServletUtilities class (Check Servlet Section) <!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.0 Transitional//EN”> <!– Example of the import attribute of the page directive. Taken from Core Web Programming Java 2 Edition from Prentice Hall and Sun Microsystems Press, . May be freely used …
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QueryViewer.java: An interactive database query viewer
# QueryViewer.java An interactive database query viewer. Connects to the specified Oracle or Sybase database, executes a query, and presents the results in a JTable. Uses the following file: * DBResultsTableModel.java Simple class that tells a JTable how to extract relevant data from a DBResults object (which is used to store the results from …
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AccessCounts.jsp Page that demonstrates JSP declarations.
AccessCounts.jsp Page that demonstrates JSP declarations. <!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.0 Transitional//EN”> <!– Taken from Core Web Programming Java 2 Edition from Prentice Hall and Sun Microsystems Press, . May be freely used or adapted. –> <HTML> <HEAD> <TITLE>JSP Declarations</TITLE> <META NAME=”keywords” CONTENT=”JSP,declarations,JavaServer,Pages,servlets”> <META NAME=”description” CONTENT=”A quick example of JSP declarations.”> …
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PreparedStatements.java An example to test the timing differences resulting from repeated raw queries vs. repeated calls
package cwp; import java.sql.*; /** An example to test the timing differences resulting * from repeated raw queries vs. repeated calls to * prepared statements. These results will vary dramatically * among database servers and drivers. With my setup * and drivers, Oracle prepared statements took only half * the time that raw queries required …
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EmployeeCreation.java: Make a simple “employees” table using the database utilities
package cwp; import java.sql.*; /** Make a simple “employees” table using DatabaseUtilities. */ public class EmployeeCreation { public static Connection createEmployees(String driver, String url, String username, String password, boolean close) { String format = “(id int, firstname varchar(32), lastname varchar(32), ” + “language varchar(16), salary float)”; …
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extract relevant data from a DBResults
# QueryViewer.java An interactive database query viewer. Connects to the specified Oracle or Sybase database, executes a query, and presents the results in a JTable. Uses the following file: * DBResultsTableModel.java Simple class that tells a JTable how to extract relevant data from a DBResults object (which is used to store the results from …
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EmployeeTest2.java: A test case for the database utilities. Prints results formatted as an HTML table.
package cwp; import java.sql.*; /** Connect to Oracle or Sybase and print “employees” table * as an HTML table. * */ public class EmployeeTest2 { public static void main(String[] args) { if (args.length < 5) { printUsage(); return; } String vendorName = args[4]; int vendor = DriverUtilities.getVendor(vendorName); …
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DBResults.java: Class to store completed results of a JDBC Query. Differs from a ResultSet in several ways
# DBResults.java Class to store completed results of a JDBC Query. Differs from a ResultSet in several ways: * ResultSet doesn?t necessarily have all the data; reconnection to database occurs as you ask for later rows. * This class stores results as strings, in arrays. * This class includes DatabaseMetaData (database product …
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DatabaseUtilities.java: Several general-purpose utilities discussed and used in the chapter.
package cwp; import java.sql.*; /** Three database utilities: * 1) getQueryResults. Connects to a database, executes * a query, retrieves all the rows as arrays * of strings, and puts them inside a DBResults * object. Also places the database product name, * database version, and the names of all the columns * into the …
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EmployeeTest.java: A test case for the database utilities. Prints results in plain text.
package cwp; import java.sql.*; /** Connect to Oracle or Sybase and print “employees” table. * */ public class EmployeeTest { public static void main(String[] args) { if (args.length < 5) { printUsage(); return; } String vendorName = args[4]; int vendor = DriverUtilities.getVendor(vendorName); if (vendor == DriverUtilities.UNKNOWN) …
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Example Java Programs
HelloWorld.java public class HelloWorld { // method main(): ALWAYS the APPLICATION entry point public static void main (String[] args) { System.out.println (“Hello World!”); } } // Print Today’s Date import java.util.*; public class HelloDate { public static void main (String[] args) { System.out.println (“Hello, it’s: “); System.out.println(new Date()); …
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FruitCreation.java: Creates a simple table named fruits in either an Oracle or a Sybase database.
FruitCreation.java Creates a simple table named fruits in either an Oracle or a Sybase database. package cwp; import java.sql.*; /** Creates a simple table named “fruits” in either * an Oracle or a Sybase database. * */ public class FruitCreation { public static void main(String[] args) { if (args.length < 5) { …
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Example illustrating inheritance and abstract classes
illustrating inheritance এবং abstract classes এর উদাহরণ Shape.java সব, বদ্ধ খোলা, বাঁকা, এবং সোজা পার্শ্বে ধারবিশিষ্ট আকার এর জন্য প্যারেন্ট ক্লাস (সারাংশ)। Curve.java একটি (সারাংশ) বাঁকা আকার (খোলা বা বন্ধ)। StraightEdgedShape.java সরাসরি ধার সম্বলিত একটি আকৃতি (খোলা বা বন্ধ)। Measurable.java পরিমাপযোগ্য এলাকায় ইন্টারফেস ডিফাইনিং ক্লাস। Circle.java একটি বৃত্ত যা আকার প্রসারিত করে এবং পরিমাপ প্রয়োগ …
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Some simple utilities for building Oracle and Sybase JDBC connections
এই সাধারণ উদ্দেশ্যে তৈরিকৃত কোড নয় – এটা আমাদের লোকাল সেটআপ এর ক্ষেত্রে প্রযোজ্য। package cwp; /** Some simple utilities for building Oracle and Sybase * JDBC connections. This is not general-purpose * code — it is specific to my local setup. */ public class DriverUtilities { public static final int ORACLE = …
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FruitTest.java: A class that connects to either an Oracle or a Sybase database and prints out the values of predetermined columns in the “fruits” table.
# FruitTest.java A class that connects to either an Oracle or a Sybase database and prints out the values of predetermined columns in the “fruits” table. package cwp; import java.sql.*; /** A JDBC example that connects to either an Oracle or * a Sybase database and prints out the values of * predetermined columns in …
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ContactSection.jsp A snippet of a JSP page. It defines a field (accessCount), so pages that include it and want to directly utilize that field must use the include directive, not jsp:include.
ContactSection.jsp হচ্ছে JSP পৃষ্ঠার একটি অংশ।এটি একটি ফিল্ডকে সঙ্গায়িত করে (accessCount), সুতরাং যে পৃষ্ঠায় এটি অন্তর্ভুক্ত থাকে এবং সরাসরি উক্ত ফিল্ড ব্যবহার করাতে চায় তাকে আবশ্যই include directive ব্যবহার করতে হবে, jsp:include নয়।. <%@ page import=”java.util.Date” %> <%– The following become fields in each servlet that results from a JSP page that includes this file. –%> <%! …
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J2SE : LinkedList and Iterators in Java
/* * LinkedList.java * * Created on January 10, 2008, 8:51 PM * * To change this template, choose Tools | Template Manager * and open the template in the editor. */ package linkedlist; import java.util.List; import java.util.LinkedList; import java.util.Iterator; import java.util.ListIterator; import java.util.Collections; import java.util.Random; /** * * @author Sayed */ public class LinkedListTest …
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Use sorting criterion in sort function
/* The following code example is taken from the book * “The C++ Standard Library – A Tutorial and Reference” * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in …
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Sort objects stored in deque
/* The following code example is taken from the book * “The C++ Standard Library – A Tutorial and Reference” * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in …
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Expressions.jsp Page that demonstrates JSP expressions. Uses the JSP-Styles style sheet.
Expressions.jsp Page that demonstrates JSP expressions. Uses the JSP-Styles style sheet. <!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.0 Transitional//EN”> <!– Example of JSP Expressions. Taken from Core Web Programming Java 2 Edition from Prentice Hall and Sun Microsystems Press, . May be freely used or adapted. –> <HTML> <HEAD> <TITLE>JSP Expressions</TITLE> <META NAME=”keywords” …
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A simple C++ Program code
#include <iostream> #include <fstream> using namespace std; int main() { ifstream in(“test”, ios::in | ios::binary); if(!in) { cout << “Cannot open input file.\n”; return 1; } double num; char str[80]; in.read((char *) &num, sizeof(double)); in.read(str, 14); str[14] = ‘\0’; // null terminate str cout …
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valarray with double value inside
/* The following code example is taken from the book * “The C++ Standard Library – A Tutorial and Reference” * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in …
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Print minimum, maximum, and sum of the valarray
/* The following code example is taken from the book * “The C++ Standard Library – A Tutorial and Reference” * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in …
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valarray slice
/* The following code example is taken from the book * “The C++ Standard Library – A Tutorial and Reference” * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in …
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Call member function for each element in vector
/* The following code example is taken from the book * “The C++ Standard Library – A Tutorial and Reference” * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in …
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Use bitset with enum together
/* The following code example is taken from the book * “The C++ Standard Library – A Tutorial and Reference” * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided “as is” without express or implied * warranty, and with no claim as to its suitability for any purpose. */ #include <bitset> #include <iostream> using namespace std; int main() { /* enumeration type for the bits * – each bit represents a color */ enum Color { red, yellow, green, blue, white, black, //…, numColors }; // create bitset for all bits/colors bitset<numColors> usedColors; // set bits for two colors usedColors.set(red); usedColors.set(blue); // print some bitset data cout << “bitfield of used colors: ” << usedColors << endl; cout << “number of used colors: ” << usedColors.count() << endl; cout << “bitfield of unused colors: ” << ~usedColors << endl; // if any color is used if (usedColors.any()) { // loop over all colors for (int c = 0; c < numColors; ++c) { // if the actual color is used if (usedColors[(Color)c]) { //… } } } } /* bitfield of used colors: 001001 number of used colors: 2 bitfield of unused colors: 110110 */
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Transform binary representation into integral number using bitset
/* The following code example is taken from the book * “The C++ Standard Library – A Tutorial and Reference” * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided “as is” without express or implied * warranty, and with no claim as to its suitability for any purpose. */ #include <bitset> #include <iostream> #include <string> #include <limits> using namespace std; int main() { /* print some numbers in binary representation */ cout << “267 as binary short: ” << bitset<numeric_limits<unsigned short>::digits>(267) << endl; cout << “267 as binary long: ” << bitset<numeric_limits<unsigned long>::digits>(267) << endl; cout << “10,000,000 with 24 bits: ” << bitset<24>(1e7) << endl; /* transform binary representation into integral number */ cout << “\”1000101011\” as number: ” << bitset<100>(string(“1000101011″)).to_ulong() << endl; } /* 267 as binary short: 0000000100001011 267 as binary long: 00000000000000000000000100001011 10,000,000 with 24 bits: 100110001001011010000000 1000101011” as number: 555 */ // create a bitset that is 8 bits long bitset<8> bs; // display that bitset for( …
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A simple applet that uses the ClickListener class
ClickReporter.java A simple applet that uses the ClickListener class to handle mouse events. *************** import java.applet.Applet; import java.awt.*; /** Prints a message saying where the user clicks. * Uses an external listener. * ****** public class ClickReporter extends Applet { public void init() { setBackground(Color.yellow); addMouseListener(new ClickListener()); } }
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