java - Dom parser is not working- output shown is all null -

i want parse xml file called "weather.xml" shown below:

<?xml version ="1.0" encoding="utf-8" ?>     <weather>         <forecast_information>                                     <city data="pittsford, ny" />                                     <postal_code data="14534" />                                      <forecast_date data="2015-03-12" />                                      <unit_system data="us" />                                   <condition data = "mostly cloudy" />                                     <temp_f data ="42" />                                     <wind_condition data="wind: nw @ 7 mph" />                                      <day_of_week data="sat" />                                      <low data="32"/>                                     <high data = "45" />                                    <condition data="rain , snow" />           </forecast_information>          <forecast_information>                                      <city data= "rochester, ny" />                                      <postal_code data="14623" />                                     <forecast_date data= "2015-03-12" />                                     <unit_system data="us" />                                      <condition data="partly cloudy" />                                      <temp_f data="40" />                                     <wind_condition data="wind: st @ 3.5 mph"       />                                      <day_of_week data="mon" />                                       <low data="30" />                                       <high data="40" />                                      <condition data="bright , sunny" />             </forecast_information>     </weather>  

i have coded dom parser in following way:

public class domparserdemo {  public static void main(string[] args){    try {       file inputfile = new file("weather.xml");      documentbuilderfactory dbfactory          = documentbuilderfactory.newinstance();      documentbuilder dbuilder = dbfactory.newdocumentbuilder();      document doc = dbuilder.parse(inputfile);      doc.getdocumentelement().normalize();      system.out.println("root element :"          + doc.getdocumentelement().getnodename());      nodelist nlist = doc.getelementsbytagname("forecast_information");      system.out.println("----------------------------");      (int temp = 0; temp < nlist.getlength(); temp++) {         node nnode = nlist.item(temp);         system.out.println("\ncurrent element :"             + nnode.getnodename());         if (nnode.getnodetype() == node.element_node) {            element eelement = (element) nnode;            system.out.println("city : " + eelement.getattribute("city"));             system.out.println("postal_code : " + eelement.getelementsbytagname("postal_code").item(0).gettextcontent());            system.out.println("forecast date : " + eelement.getelementsbytagname("forecast_date").item(0).gettextcontent());            system.out.println("unit system : " + eelement .getelementsbytagname("unit_system") .item(0).gettextcontent());            system.out.println("condition : " + eelement .getelementsbytagname("condition") .item(0).gettextcontent());            system.out.println("wind condition : " + eelement .getelementsbytagname("wind_condition") .item(0).gettextcontent());            system.out.println("day of week : " + eelement .getelementsbytagname("day_of_week") .item(0).gettextcontent());            system.out.println("low : " + eelement .getelementsbytagname("low") .item(0).gettextcontent());            system.out.println("high: " + eelement .getelementsbytagname("high") .item(0).gettextcontent());             }      }   } catch (exception e) {      e.printstacktrace();   }  }  } 

but output shown follows, information not being extracted .xml file provided:

   root element :weather    ----------------------------     current element :forecast_information    city :     postal_code :     forecast date :     unit system :     condition :     wind condition :     day of week :     low :     high:      current element :forecast_information    city :     postal_code :     forecast date :     unit system :     condition :     wind condition :     day of week :     low :     high:  

first mistake:

system.out.println("city : " + eelement.getattribute("city")); 

you asking attribute of element named city, forecast_information element doesn't have attributes. city child element of forecast_information, should extract either traversing children or using getelementsbytagname() rest of items.

second mistake:

for other elements, doing getelementsbytagname, works fine retrieving element itself. however, data item want retrieve not content - it's attribute.

using gettextcontent() correct if items looked this:

<forecast_date>2015-03-12</forecast_date>  <unit_system>us</unit_system> 

but not how xml formatted. in xml, need retrieve attribute data. should replace calls like:

system.out.println("postal_code : " + eelement.getelementsbytagname("postal_code").item(0).gettextcontent()); 

to:

system.out.println("postal_code : " + eelement.getelementsbytagname("postal_code").item(0).getattribute("data"));