This code example shows how to create a simple web service. We use the annotation @WebService to declare the class as a such.
The annotation @WebMethod is provided at method level to declare it as an operation for the web service.
The operation getTime of the JavadbWebService simply returns the current time.

package com.javabout.ws.example;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import javax.jws.WebMethod;
import javax.jws.WebService;

/**
 *
 * @author www.javabout.com
 */

@WebService()
public class JavaboutWebService {
    
    @WebMethod
    public String getTime() {
        
        Calendar calendar = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat(“HH:mm”);
        return (sdf.format(calendar.getTime()));
        
    }

}

The result of a call to the operation getTime produces something like this:

This example shows how to create a web service client using JAX-WS reference implementation and its tool ‘wsimport’.
JAX-WS RI can be downloaded from Sun (http://java.sun.com).

To create the web service client we need an existing web service, so we will use the one created in the example ‘Create a simple Web Service’:

package com.javabout.examples;

import com.javabout.ws.example.JavaboutWebService;
import com.javabout.ws.example.JavaboutWebServiceService;

/**
 *
 * @author www.javabout.com
 */
public class Main {

    public void callWebService() {

        /* Note, the JavaboutWebServiceService class has two constructors.
         * The default one that we use here uses the wsdl-location that was
         * specified at the time of the generation of the client classes,
         * i.e. localhost. If the service is deployed at
         * another location you need to use the constructor:
         * public JavaboutWebServiceService(URL wsdlLocation, QName serviceName)
         */
        JavaboutWebServiceService service = new JavaboutWebServiceService();
        JavaboutWebService port = service.getJavaboutWebServicePort();
        
        String currentTime = port.getTime();
        
        System.out.println(“Current time is: “ + currentTime);
        
        
    }

    public static void main(String[] args) {
        new Main().callWebService();
    }
}

Note that you need the genereated classes and the jax-ws libraries in the classpath when you compile and run the above class.
That is easiest done by pointing them out in your project properties in the IDE.

The output looks something like this:

Sometimes you need to insert information in the soap header when calling a web service. Perhaps the service needs authentication information that needs to be set.
This example shows how to set the security information for a Web Service that is deployed on a Weblogic server using JAX-WS and SAAJ.

First we need to create the actual handler which implements the SOAPHandler interface.
Next we need to create the class that implements the HandlerResolver interface. This class decides what handlers should be called and in what specific order. The handler above is added to this class.
Finally we need to add the HandlerResolver instance to the Web Service Client.

By default the SOAP header is empty, but this is what we want the header to look like on the outbound call (the call to the web service):

package com.javadb.ws.example;

import java.util.Set;
import javax.xml.namespace.QName;
import javax.xml.soap.SOAPElement;
import javax.xml.soap.SOAPEnvelope;
import javax.xml.soap.SOAPHeader;
import javax.xml.soap.SOAPMessage;
import javax.xml.ws.handler.MessageContext;
import javax.xml.ws.handler.soap.SOAPHandler;
import javax.xml.ws.handler.soap.SOAPMessageContext;

/**
 *
 * @author www.javabout.com
 */
public class HeaderHandler implements SOAPHandler<SOAPMessageContext> {

    public boolean handleMessage(SOAPMessageContext smc) {

        Boolean outboundProperty = (Boolean) smc.get(MessageContext.MESSAGE_OUTBOUND_PROPERTY);

        if (outboundProperty.booleanValue()) {

            SOAPMessage message = smc.getMessage();

            try {

                SOAPEnvelope envelope = smc.getMessage().getSOAPPart().getEnvelope();
                SOAPHeader header = envelope.addHeader();

                SOAPElement security =
                        header.addChildElement(“Security”, “wsse”, “http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd”);

                SOAPElement usernameToken =
                        security.addChildElement(“UsernameToken”, “wsse”);
                usernameToken.addAttribute(new QName(“xmlns:wsu”), “http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd”);

                SOAPElement username =
                        usernameToken.addChildElement(“Username”, “wsse”);
                username.addTextNode(“TestUser”);

                SOAPElement password =
                        usernameToken.addChildElement(“Password”, “wsse”);
                password.setAttribute(“Type”, “http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText”);
               password.addTextNode(“TestPassword”);

                //Print out the outbound SOAP message to System.out
                message.writeTo(System.out);
                System.out.println(“”);
                
            } catch (Exception e) {
                e.printStackTrace();
            }

        } else {
            try {
                
                //This handler does nothing with the response from the Web Service so
                //we just print out the SOAP message.
                SOAPMessage message = smc.getMessage();
                message.writeTo(System.out);
                System.out.println(“”);

            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }

        return outboundProperty;

    }

    public Set getHeaders() {
        //throw new UnsupportedOperationException(“Not supported yet.”);
        return null;
    }

    public boolean handleFault(SOAPMessageContext context) {
        //throw new UnsupportedOperationException(“Not supported yet.”);
        return true;
    }

    public void close(MessageContext context) {
    //throw new UnsupportedOperationException(“Not supported yet.”);
    }
}

The handler resolver that is to contain the SOAP handler above looks like this:

package com.javadb.ws.example;

import java.util.ArrayList;
import java.util.List;
import javax.xml.ws.handler.Handler;
import javax.xml.ws.handler.HandlerResolver;
import javax.xml.ws.handler.PortInfo;

/**
 *
 * @author www.javabout.com
 */
public class HeaderHandlerResolver implements HandlerResolver {
    
public List<Handler> getHandlerChain(PortInfo portInfo) {
      List<Handler> handlerChain = new ArrayList<Handler>();

      HeaderHandler hh = new HeaderHandler();

      handlerChain.add(hh);

      return handlerChain;
   }
}

Finally we need to add the handler resolver to our web service client class.

JavadbWebServiceService service = new JavadbWebServiceService();

   HeaderHandlerResolver handlerResolver = new HeaderHandlerResolver();
   service.setHandlerResolver(handlerResolver);

   JavadbWebService port = service.getJavadbWebServicePort();
        
   //Call web service
   String currentTime = port.getTime();
        
   System.out.println(“Current time is: “ + currentTime);

To find out how to generate the web service client classes check out this example:

This example shows how to display all available time zone IDs. These IDs are essential when you want to use classes like Date and Calendar and display the time in another time zone than default.
To retrieve the time zones we call the static method getAvailableIDs of the TimeZone class. It returns an array of strings with the ID of each time zone.
The array returned is quite extensive and to make it easier to find what we’re looking for in the output, we call the sort method of the Arrays class to sort the array.

package com.javadb.examples;

import java.util.Arrays;
import java.util.TimeZone;

/**
 *
 * @a*#117;t*#104;*#111;*#114; *#119;*#119;w*#46;*#106;*#97;*#118;ad*#98;*#46;c*#111;*#109;
 */
public class Main {

    public void listTimeZoneIDs() {

        String[] allTimeZones = TimeZone.getAvailableIDs();
        
        Arrays.sort(allTimeZones);

        for (String timezone : allTimeZones) {
            System.out.println(timezone);
        }
    }

    public static void main(String[] args) {

        Main main = new Main();
        main.listTimeZoneIDs();
    }
}

The output looks like this:

ACT AET AGT ART AST Africa/Abidjan Africa/Accra Africa/Addis_Ababa Africa/Algiers Africa/Asmera Africa/Bamako Africa/Bangui Africa/Banjul Africa/Bissau Africa/Blantyre Africa/Brazzaville Africa/Bujumbura Africa/Cairo Africa/Casablanca Africa/Ceuta Africa/Conakry Africa/Dakar Africa/Dar_es_Salaam Africa/Djibouti Africa/Douala Africa/El_Aaiun Africa/Freetown Africa/Gaborone Africa/Harare Africa/Johannesburg Africa/Kampala Africa/Khartoum Africa/Kigali Africa/Kinshasa Africa/Lagos Africa/Libreville Africa/Lome Africa/Luanda Africa/Lubumbashi Africa/Lusaka Africa/Malabo Africa/Maputo Africa/Maseru Africa/Mbabane Africa/Mogadishu Africa/Monrovia Africa/Nairobi Africa/Ndjamena Africa/Niamey Africa/Nouakchott Africa/Ouagadougou Africa/Porto-Novo Africa/Sao_Tome Africa/Timbuktu Africa/Tripoli Africa/Tunis Africa/Windhoek America/Adak America/Anchorage America/Anguilla America/Antigua America/Araguaina America/Argentina/Buenos_Aires America/Argentina/Catamarca America/Argentina/ComodRivadavia America/Argentina/Cordoba America/Argentina/Jujuy America/Argentina/La_Rioja America/Argentina/Mendoza America/Argentina/Rio_Gallegos America/Argentina/San_Juan America/Argentina/Tucuman America/Argentina/Ushuaia America/Aruba America/Asuncion America/Atka America/Bahia America/Barbados America/Belem America/Belize America/Boa_Vista America/Bogota America/Boise America/Buenos_Aires America/Cambridge_Bay America/Campo_Grande America/Cancun America/Caracas America/Catamarca America/Cayenne America/Cayman America/Chicago America/Chihuahua America/Coral_Harbour America/Cordoba America/Costa_Rica America/Cuiaba America/Curacao America/Danmarkshavn America/Dawson America/Dawson_Creek America/Denver America/Detroit America/Dominica America/Edmonton America/Eirunepe America/El_Salvador America/Ensenada America/Fort_Wayne America/Fortaleza America/Glace_Bay America/Godthab America/Goose_Bay America/Grand_Turk America/Grenada America/Guadeloupe America/Guatemala America/Guayaquil America/Guyana America/Halifax America/Havana America/Hermosillo America/Indiana/Indianapolis America/Indiana/Knox America/Indiana/Marengo America/Indiana/Petersburg America/Indiana/Vevay America/Indiana/Vincennes America/Indianapolis America/Inuvik America/Iqaluit America/Jamaica America/Jujuy America/Juneau America/Kentucky/Louisville America/Kentucky/Monticello America/Knox_IN America/La_Paz America/Lima America/Los_Angeles America/Louisville America/Maceio America/Managua America/Manaus America/Martinique America/Mazatlan America/Mendoza America/Menominee America/Merida America/Mexico_City America/Miquelon America/Moncton America/Monterrey America/Montevideo America/Montreal America/Montserrat America/Nassau America/New_York America/Nipigon America/Nome America/Noronha America/North_Dakota/Center America/North_Dakota/New_Salem America/Panama America/Pangnirtung America/Paramaribo America/Phoenix America/Port-au-Prince America/Port_of_Spain America/Porto_Acre America/Porto_Velho America/Puerto_Rico America/Rainy_River America/Rankin_Inlet America/Recife America/Regina America/Rio_Branco America/Rosario America/Santiago America/Santo_Domingo America/Sao_Paulo America/Scoresbysund America/Shiprock America/St_Johns America/St_Kitts America/St_Lucia America/St_Thomas America/St_Vincent America/Swift_Current America/Tegucigalpa America/Thule America/Thunder_Bay America/Tijuana America/Toronto America/Tortola America/Vancouver America/Virgin America/Whitehorse America/Winnipeg America/Yakutat America/Yellowknife Antarctica/Casey Antarctica/Davis Antarctica/DumontDUrville Antarctica/Mawson Antarctica/McMurdo Antarctica/Palmer Antarctica/Rothera Antarctica/South_Pole Antarctica/Syowa Antarctica/Vostok Arctic/Longyearbyen Asia/Aden Asia/Almaty Asia/Amman Asia/Anadyr Asia/Aqtau Asia/Aqtobe Asia/Ashgabat Asia/Ashkhabad Asia/Baghdad Asia/Bahrain Asia/Baku Asia/Bangkok Asia/Beirut Asia/Bishkek Asia/Brunei Asia/Calcutta Asia/Choibalsan Asia/Chongqing Asia/Chungking Asia/Colombo Asia/Dacca Asia/Damascus Asia/Dhaka Asia/Dili Asia/Dubai Asia/Dushanbe Asia/Gaza Asia/Harbin Asia/Hong_Kong Asia/Hovd Asia/Irkutsk Asia/Istanbul Asia/Jakarta Asia/Jayapura Asia/Jerusalem Asia/Kabul Asia/Kamchatka Asia/Karachi Asia/Kashgar Asia/Katmandu Asia/Krasnoyarsk Asia/Kuala_Lumpur Asia/Kuching Asia/Kuwait Asia/Macao Asia/Macau Asia/Magadan Asia/Makassar Asia/Manila Asia/Muscat Asia/Nicosia Asia/Novosibirsk Asia/Omsk Asia/Oral Asia/Phnom_Penh Asia/Pontianak Asia/Pyongyang Asia/Qatar Asia/Qyzylorda Asia/Rangoon Asia/Riyadh Asia/Riyadh87 Asia/Riyadh88 Asia/Riyadh89 Asia/Saigon Asia/Sakhalin Asia/Samarkand Asia/Seoul Asia/Shanghai Asia/Singapore Asia/Taipei Asia/Tashkent Asia/Tbilisi Asia/Tehran Asia/Tel_Aviv Asia/Thimbu Asia/Thimphu Asia/Tokyo Asia/Ujung_Pandang Asia/Ulaanbaatar Asia/Ulan_Bator Asia/Urumqi Asia/Vientiane Asia/Vladivostok Asia/Yakutsk Asia/Yekaterinburg Asia/Yerevan Atlantic/Azores Atlantic/Bermuda Atlantic/Canary Atlantic/Cape_Verde Atlantic/Faeroe Atlantic/Jan_Mayen Atlantic/Madeira Atlantic/Reykjavik Atlantic/South_Georgia Atlantic/St_Helena Atlantic/Stanley Australia/ACT Australia/Adelaide Australia/Brisbane Australia/Broken_Hill Australia/Canberra Australia/Currie Australia/Darwin Australia/Hobart Australia/LHI Australia/Lindeman Australia/Lord_Howe Australia/Melbourne Australia/NSW Australia/North Australia/Perth Australia/Queensland Australia/South Australia/Sydney Australia/Tasmania Australia/Victoria Australia/West Australia/Yancowinna BET BST Brazil/Acre Brazil/DeNoronha Brazil/East Brazil/West CAT CET CNT CST CST6CDT CTT Canada/Atlantic Canada/Central Canada/East-Saskatchewan Canada/Eastern Canada/Mountain Canada/Newfoundland Canada/Pacific Canada/Saskatchewan Canada/Yukon Chile/Continental Chile/EasterIsland Cuba EAT ECT EET EST EST5EDT Egypt Eire Etc/GMT Etc/GMT 0 Etc/GMT 1 Etc/GMT 10 Etc/GMT 11 Etc/GMT 12 Etc/GMT 2 Etc/GMT 3 Etc/GMT 4 Etc/GMT 5 Etc/GMT 6 Etc/GMT 7 Etc/GMT 8 Etc/GMT 9 Etc/GMT-0 Etc/GMT-1 Etc/GMT-10 Etc/GMT-11 Etc/GMT-12 Etc/GMT-13 Etc/GMT-14 Etc/GMT-2 Etc/GMT-3 Etc/GMT-4 Etc/GMT-5 Etc/GMT-6 Etc/GMT-7 Etc/GMT-8 Etc/GMT-9 Etc/GMT0 Etc/Greenwich Etc/UCT Etc/UTC Etc/Universal Etc/Zulu Europe/Amsterdam Europe/Andorra Europe/Athens Europe/Belfast Europe/Belgrade Europe/Berlin Europe/Bratislava Europe/Brussels Europe/Bucharest Europe/Budapest Europe/Chisinau Europe/Copenhagen Europe/Dublin Europe/Gibraltar Europe/Helsinki Europe/Istanbul Europe/Kaliningrad Europe/Kiev Europe/Lisbon Europe/Ljubljana Europe/London Europe/Luxembourg Europe/Madrid Europe/Malta Europe/Mariehamn Europe/Minsk Europe/Monaco Europe/Moscow Europe/Nicosia Europe/Oslo Europe/Paris Europe/Prague Europe/Riga Europe/Rome Europe/Samara Europe/San_Marino Europe/Sarajevo Europe/Simferopol Europe/Skopje Europe/Sofia Europe/Stockholm Europe/Tallinn Europe/Tirane Europe/Tiraspol Europe/Uzhgorod Europe/Vaduz Europe/Vatican Europe/Vienna Europe/Vilnius Europe/Warsaw Europe/Zagreb Europe/Zaporozhye Europe/Zurich GB GB-Eire GMT GMT0 Greenwich HST Hongkong IET IST Iceland Indian/Antananarivo Indian/Chagos Indian/Christmas Indian/Cocos Indian/Comoro Indian/Kerguelen Indian/Mahe Indian/Maldives Indian/Mauritius Indian/Mayotte Indian/Reunion Iran Israel JST Jamaica Japan Kwajalein Libya MET MIT MST MST7MDT Mexico/BajaNorte Mexico/BajaSur Mexico/General Mideast/Riyadh87 Mideast/Riyadh88 Mideast/Riyadh89 NET NST NZ NZ-CHAT Navajo PLT PNT PRC PRT PST PST8PDT Pacific/Apia Pacific/Auckland Pacific/Chatham Pacific/Easter Pacific/Efate Pacific/Enderbury Pacific/Fakaofo Pacific/Fiji Pacific/Funafuti Pacific/Galapagos Pacific/Gambier Pacific/Guadalcanal Pacific/Guam Pacific/Honolulu Pacific/Johnston Pacific/Kiritimati Pacific/Kosrae Pacific/Kwajalein Pacific/Majuro Pacific/Marquesas Pacific/Midway Pacific/Nauru Pacific/Niue Pacific/Norfolk Pacific/Noumea Pacific/Pago_Pago Pacific/Palau Pacific/Pitcairn Pacific/Ponape Pacific/Port_Moresby Pacific/Rarotonga Pacific/Saipan Pacific/Samoa Pacific/Tahiti Pacific/Tarawa Pacific/Tongatapu Pacific/Truk Pacific/Wake Pacific/Wallis Pacific/Yap Poland Portugal ROK SST Singapore SystemV/AST4 SystemV/AST4ADT SystemV/CST6 SystemV/CST6CDT SystemV/EST5 SystemV/EST5EDT SystemV/HST10 SystemV/MST7 SystemV/MST7MDT SystemV/PST8 SystemV/PST8PDT SystemV/YST9 SystemV/YST9YDT Turkey UCT US/Alaska US/Aleutian US/Arizona US/Central US/East-Indiana US/Eastern US/Hawaii US/Indiana-Starke US/Michigan US/Mountain US/Pacific US/Pacific-New US/Samoa UTC Universal VST W-SU WET Zulu

]]> http://www.javabout.com/2009/03/06/display-available-time-zones/feed/ 0 http://www.javabout.com/2009/03/06/using-the-calendar-class-to-display-current-time-in-different-time-zones/ http://www.javabout.com/2009/03/06/using-the-calendar-class-to-display-current-time-in-different-time-zones/#comments Fri, 06 Mar 2009 13:55:10 +0000 admin http://www.javabout.com/?p=436

To display time in a specific time zone we can use the Calendar class. After it has been created we set the time zone on the instance using the method setTimeZone. It is really all that is to it, after that we can just query the instance for hours and minutes as in the code example below where time in three major cities around the world is displayed.

package com.javadb.examples;

import java.util.Calendar;
import java.util.TimeZone;

/**
 *
 * @a*#117;tho*#114; w*#119;*#119;*#46;j*#97;*#118;adb.*#99;om
 */
public class Main {

    public void setTimeZones() {
        
        Calendar calNewYork = Calendar.getInstance();
        Calendar calParis = Calendar.getInstance();
        Calendar calTokyo = Calendar.getInstance();
        
        calNewYork.setTimeZone(TimeZone.getTimeZone(“America/New_York”));
        calParis.setTimeZone(TimeZone.getTimeZone(“Europe/Paris”));
        calTokyo.setTimeZone(TimeZone.getTimeZone(“Asia/Tokyo”));
        
        System.out.println(“Time in New York: “
                calNewYork.get(Calendar.HOUR_OF_DAY) “:”
                calNewYork.get(Calendar.MINUTE));
        
        System.out.println(“Time in Paris: “
                calParis.get(Calendar.HOUR_OF_DAY) “:”
                calParis.get(Calendar.MINUTE));

        System.out.println(“Time in Tokyo: “
                calTokyo.get(Calendar.HOUR_OF_DAY) “:”
                calTokyo.get(Calendar.MINUTE));

    }

    public static void main(String[] args) {

        Main main = new Main();
        main.setTimeZones();
    }
}

Here is what the output looked like when the example above was run:

Time in New York: 13:52 Time in Paris: 19:52 Time in Tokyo: 2:52

To display a list of available time zone IDs, please see this link:

Display Available Time Zones

]]> http://www.javabout.com/2009/03/06/using-the-calendar-class-to-display-current-time-in-different-time-zones/feed/ 0 http://www.javabout.com/2009/03/06/load-a-resource-bundle/ http://www.javabout.com/2009/03/06/load-a-resource-bundle/#comments Fri, 06 Mar 2009 13:54:54 +0000 admin http://www.javabout.com/?p=435

This example shows how to load a ResourceBundle from the classpath and then enumerate through it.
Since ResourceBundle is an abstract class and therefore cannot be instantiated we call its static method getBundle() which returns the ResourceBundle instance.
The method has a few overloads but we use the one that takes a basename (in this case ‘Phrases’) and a locale. This means that somewhere on the classpath there has to be a file named ‘Phrases_en_US.properties’.
In this example the file only has two rows (see further below). An Enumeration with the keys is obtained by calling the getKeys() method, then a while-loop is used to enumerate through the keys and print out each of them along with the value.

package com.javadb.examples;

import java.util.Enumeration;
import java.util.Locale;
import java.util.ResourceBundle;


/**
 *
 * @aut*#104;o*#114; *#119;w*#119;.*#106;*#97;vadb.*#99;om
 */
public class Main {
    
    public void loadResourceBundle() {
        
        ResourceBundle resource = ResourceBundle.getBundle(“Phrases”, Locale.US);
        
        Enumeration<String> keys = resource.getKeys();
        
        String key = null;
        while (keys.hasMoreElements()) {
            
            key = keys.nextElement();
            
            System.out.println(key ” – “ resource.getObject(key));
        }
    }

 
    public static void main(String[] args) {

        new Main().loadResourceBundle();
    }
 
 }

This is what the contents of the Phrases_en_US.properties file looks like:

phrase1=Hello phrase2=World

…and this is what the output looks like when the example is run:

phrase2 – World phrase1 – Hello

]]> http://www.javabout.com/2009/03/06/load-a-resource-bundle/feed/ 0 http://www.javabout.com/2009/03/06/getting-currency-symbols/ http://www.javabout.com/2009/03/06/getting-currency-symbols/#comments Fri, 06 Mar 2009 13:54:38 +0000 admin http://www.javabout.com/?p=434

This example shows how to get the currency symbols for different countries. The code below displays the currency symbols for three countries, US, UK and France.

package com.javadb.examples;

import java.util.Currency;
import java.util.Locale;


/**
 *
 * *#64;author *#119;*#119;*#119;*#46;java*#100;b.*#99;*#111;*#109;
 */
public class Main {
    
    public void displayCurrencySymbols() {
        
        Currency currency = Currency.getInstance(Locale.US);
        System.out.println(“United States: “ currency.getSymbol());
 
        currency = Currency.getInstance(Locale.UK);
        System.out.println(“United Kingdom: “ currency.getSymbol());
 
        currency = Currency.getInstance(Locale.FRANCE);
        System.out.println(“France: “ currency.getSymbol());
        
    }
    public static void main(String[] args) {

        new Main().displayCurrencySymbols();
    }
 
 }

The output from the code example:

United States: USD United Kingdom: GBP France: €

]]> http://www.javabout.com/2009/03/06/getting-currency-symbols/feed/ 0 http://www.javabout.com/2009/03/06/get-current-date-and-time-with-the-simpledateformat-class/ http://www.javabout.com/2009/03/06/get-current-date-and-time-with-the-simpledateformat-class/#comments Fri, 06 Mar 2009 13:54:20 +0000 admin http://www.javabout.com/?p=433

This class prints current date and time by creating a Date object and using instances of SimpleDateFormat to format the Date object.
See the SimpleDateFormat api reference for more format options.

import java.text.SimpleDateFormat;
import java.util.Date;


public class GetDateTime {

  
  public GetDateTime() {
    
    SimpleDateFormat sdfDate = new SimpleDateFormat(“dd/MM/yyyy”);
    SimpleDateFormat sdfTime = new SimpleDateFormat(“HH:mm:ss”);
    
    Date now = new Date();
    
    String strDate = sdfDate.format(now);
    String strTime = sdfTime.format(now);
    
    System.out.println(“Date: “ strDate);
    System.out.println(“Time: “ strTime);
    
  }

  public static void main(String[] args) {
    GetDateTime getDateTime = new GetDateTime();
  }
}

 

>This code example shows how to increment and decrement a date using an instance of the Calendar class.
The first method, incrementDate, increments the Calendar which is passed to the method by 5 days.
The second method, decrementDate, decrements the same Calendar instance with one month.

>import java.util.Calendar;

/**
 *
 * @*#97;*#117;t*#104;*#111;*#114; *#119;*#119;w*#46;*#106;*#97;v*#97;*#100;*#98;.*#99;*#111;m
 */
public class Main {
    
    public void incrementDate(Calendar cal) {
        
        int daysToIncrement = 5;
 
        cal.add(Calendar.DATE, daysToIncrement);
        System.out.println(“Date after increment: “ cal.getTime());
    }
    
    public void decrementDate(Calendar cal) {
        
        int monthsToDecrement = -1;
        cal.add(Calendar.MONTH, monthsToDecrement);
        System.out.println(“Date after decrement: “ cal.getTime());
 
    }
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        
        Calendar cal = Calendar.getInstance();
        System.out.println(“Now : “ cal.getTime());
        Main main = new Main();
        main.incrementDate(cal);
        main.decrementDate(cal);
    }
}
 

Since both the increment and decrement methods are called with the same instance of the Calendar class, the output from the code example showed this when it was executed:

Now : Wed Oct 01 18:15:15 CEST 2008 Date after increment: Mon Oct 06 18:15:15 CEST 2008 Date after decrement: Sat Sep 06 18:15:15 CEST 2008

]]> http://www.javabout.com/2009/03/06/increment-and-decrement-a-date-using-the-calendar-class/feed/ 0 http://www.javabout.com/2009/03/06/get-todays-date/ http://www.javabout.com/2009/03/06/get-todays-date/#comments Fri, 06 Mar 2009 13:53:53 +0000 admin http://www.javabout.com/?p=431 This code example shows how to output today’s date. It uses the Calendar class. Since it is an abstract class and therefore cannot be instantiated we created it using the getInstance() method. Then we create an instance of the SimpleDateFormat class which takes the format we want to display the date in as argument to the constructor.Finally the method ‘format()’ is called on the SimpleDateFormat object. The format() method takes a java.util.Date object as argument and we can get our hands on one by calling the getTime() method of the ...]]>

>This code example shows how to output today’s date. It uses the Calendar class. Since it is an abstract class and therefore cannot be instantiated we created it using the getInstance() method. Then we create an instance of the SimpleDateFormat class which takes the format we want to display the date in as argument to the constructor.
Finally the method ‘format()’ is called on the SimpleDateFormat object. The format() method takes a java.util.Date object as argument and we can get our hands on one by calling the getTime() method of the Calendar instance.

>import java.text.SimpleDateFormat;
import java.util.Calendar;


/**
 *
 * *#64;*#97;*#117;th*#111;r w*#119;*#119;.ja*#118;a*#100;*#98;*#46;c*#111;m
 */
public class Main {
    
    public void convertDateToString() {
        
        Calendar calendar = Calendar.getInstance();
        SimpleDateFormat dateFormat = new SimpleDateFormat(“dd/MM/yyyy”);
 
        try {
            
            System.out.println(“Today: “ dateFormat.format(calendar.getTime()));
            
        } catch (Exception e) {
            e.printStackTrace();
        }
        
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        new Main().convertDateToString();
    }

}

The output from the code above prints the current date.

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