java - How do i change the value of myDate1 and print out that new value within my main method? -

how use 3 individual set methods change mydate1 new date input?

heres 3 set methods

   public void setmonth( int mm )   {     month = ( mm >= 1 && mm <= 12 ? mm : 1 );   }    /** setday   *  @param dd new value day   *  if dd legal day current month, sets day dd   *  otherwise, sets day 1   */   public void setday( int dd )   {     day = ( dd >= 1 && isvalidday( dd ) ? dd : 1 );   }    /** setyear   *  @param yyyy new value year   *  sets year yyyy   */   public void setyear( int yyyy )   {     year = yyyy;   } 

i want keep code write main method.

here rest of code.

 import java.io.serializable;       // object i/o file import java.util.scanner; //public class simpledate public class simpledateclientfl implements serializable  {    private int month;   private int day;   private int year;    public static void main(string[] args) {   scanner input = new scanner(system.in);     int month;     int day;     int year;     simpledate mydate1 = new simpledate();      simpledate mydate2 = new simpledate();      system.out.println(mydate1.tostring());      system.out.println(mydate1);      mydate1.nextday();     mydate1.nextday();     mydate1.nextday();      system.out.println(mydate1);      system.out.print("enter day: ");     day = input.nextint();        system.out.print("enter month: ");     month = input.nextint();        system.out.print("enter year: ");     year = input.nextint();        system.out.println("my birthday: " + mydate1);   }    /** default constructor   *  sets month 1, day 1 , year 2000   */   public void simpledate( )   {      setdate( 1, 1, 2000 );   }    /** overloaded constructor   *  @param mm    initial value month   *  @param dd    initial value day   *  @param yyyy  initial value year   *   *  passes parameters set methods   */   public void simpledate( int mm, int dd, int yyyy )   {     setmonth( mm );     setyear( yyyy );     setday( dd );   }    /* accessor methods */   int getmonth( ) { return month; }   int getday( )   { return day; }   int getyear( )  { return year; }    /** mutator method */   /** setmonth   *  @param mm new value month   *  if mm between 1 , 12, sets month mm   *  otherwise, sets month 1   */   public void setmonth( int mm )   {     month = ( mm >= 1 && mm <= 12 ? mm : 1 );   }    /** setday   *  @param dd new value day   *  if dd legal day current month, sets day dd   *  otherwise, sets day 1   */   public void setday( int dd )   {     day = ( dd >= 1 && isvalidday( dd ) ? dd : 1 );   }    /** setyear   *  @param yyyy new value year   *  sets year yyyy   */   public void setyear( int yyyy )   {     year = yyyy;   }    /** sets date next day   */   public void nextday( )   {      if ( ! isvalidday( ++day ) )      {          day = 1;          if ( ++month > 12 )          {              month = 1;              year++;          }      }    }    private boolean isvalidday( int newday )   {      int [] daysinmonth = { 0, 31, 28, 31,                                 30, 31, 30,                                 31, 31, 30,                                31, 30, 31 };      if ( newday > daysinmonth[month] )     {        if ( month == 2 && isleapyear( ) && newday == 29 )           return true;        else           return false;     }     else        return true;    }    private boolean isleapyear( )   {      return !( year % 4 != 0                ||( year % 100 == 0 && year % 400 != 0 ) );   }     /** setdate   *  @param mm    new value month   *  @param dd    new value day   *  @param yyyy  new value year   *  passes parameters setmonth, setday, , setyear   */   public void setdate( int mm, int dd, int yyyy )   {     setyear( yyyy );  // set year first (could leap year)     setmonth( mm );   // set month next     setday( dd );     // set day   }    /** tostring   *  @return string   *  returns date in mm/dd/yyyy format   */   public string tostring( )   {     return month + "/" + day + "/" + year;   }    /** equals   *  @param   d  object compare object   *  @return  true if d equal object   *           false, otherwise   */   public boolean equals( object d )   {     if ( !( d instanceof simpledate ) )        return false;     simpledateclientfl d1 = (simpledateclientfl)d;     if ( month == d1.month          && day == d1.day          && year == d1.year )       return true;     else       return false;   } } 

thanks in advance. if need supply other information please let me know.

your must know when set filed

month = input.nextint();  

you modify "this" object ,but not following object "new"

simpledate mydate1 = new simpledate(); 

so, when in static main method, must have access simpledate's filed.

simple, can make fields public,so can modify this:

mydate1.month = input.nextint();  

or can add method set fields did! can call it

mydate1.setmonth(input.nextint());