java - Variables lose their value somehow? -


when try run program, result null, 0 0. why values of monthname, day, , year not show when getday() method invoked , printed on screen. 

public class assignment1 {      public static void main(string[] args) {          //creates array of type date filled 2 longdate objects         date [] collectionofdates = { new longdate("february",2,1996), new longdate("february",13,1999) };          // loops through array , displays output of getdate() each object         for( int = 0; < collectionofdates.length; i++ ) {             system.out.println( collectionofdates[i].getdate() );         }      }  }

for information, longdate class subclass of date class contains methods editday() , edityear() along several others. longdate method listed below.

any appreciated, thanks. also, feel free comment if want more information.

public class longdate extends date {      private string monthname;     private int day;     private int year;      public longdate() {      }      public longdate(string m, int d, int y) {          super.editday(d);         super.edityear(y);         editmonth(m);      }      public void setdate(string m, int d, int y) {          monthname = m;         day = d;         year = y;      }       public string getdate() {          stringbuilder fulldate = new stringbuilder();         fulldate.append(monthname);         fulldate.append(" ");         fulldate.append(day);         fulldate.append(", ");         fulldate.append(year);          return fulldate.tostring();     }      public string getshortdate() {          int month = 0;          if (monthname == "january") {             month = 1;         } else if (monthname == "february") {             month = 2;         } else if (monthname == "march") {             month = 3;         } else if (monthname == "april") {             month = 4;         } else if (monthname == "may") {             month = 5;         } else if (monthname == "june") {             month = 6;         } else if (monthname == "july") {             month = 7;         } else if (monthname == "august") {             month = 8;         } else if (monthname == "september") {             month = 9;         } else if (monthname == "october") {             month = 10;         } else if (monthname == "november") {             month = 11;         } else if (monthname == "december") {             month = 12;         }          stringbuilder shortdate = new stringbuilder();         shortdate.append(month);         shortdate.append("/");         shortdate.append(day);         shortdate.append("/");         shortdate.append(year);          return shortdate.tostring();     }      protected string editmonth(string m) {          // asks person try again if month not capitalized , spelled         if (m != "january" && m != "february" && m != "march" && m != "april" && m != "may" && m != "june" && m != "july" && m != "august" && m != "september" && m != "october" && m != "november" && m != "december") {             m = input.getstring( "invalid month. please type month again." );             return m;         } else             return m;     } }

there's nothing in constructor of longdate sets fields (monthname, day, , year) getdate() reads.

i assume date#editday() , date#edityear() functions similar longdate#editmonth(). note editmonth() not assign value monthname field!


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