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Thread: whats wrong? help to newbie

  1. #1
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    Default whats wrong? help to newbie

    hi all,
    can any one tell me what's wrong?
    i'm triyng to get next date from object that I created and still getting the same date

    public Date nextDay()
       { int newDay=this.day, newMonth=this.month, newYear=this.year;
            if ((this.month == 1) || (this.month == 3) || (this.month == 5) || (this.month == 7) || (this.month == 8) || (this.month == 10)){
               if (this.day < 31)
               newDay = +this.day;
               if (this.day == 31)
               newDay = 01;
               newMonth = +this.month;
            }
            if ((this.month == 4) || (this.month == 6) || (this.month == 9) || (this.month == 11)){
              if (this.day < 30)
              newDay = +this.day;
              if (this.day == 30)
              newDay = 01;
              newMonth = +this.month;
            }
            if (this.month == 2){
              if (this.day < 28)
               newDay = +this.day;
              if (this.day == 28)
               newDay = 01;
               newMonth = +this.month;
              if (((this.year%4 == 0) && (this.year%100!=0) || (this.year%400==0)) && (this.day==28))
              newDay = +this.day;
            }
            if (this.month == 12){
               if (this.day < 31)
               newDay = +this.day;
               if (this.day == 31)
               newYear = +this.year;
               newMonth = 01;
               newDay = 01;
            }   
         return new Date(newDay, newMonth, newYear);
        }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: whats wrong? help to newbie

    still getting the same date
    Please explain.
    Add some printlns to your program to show the problem.
    Print out the values of all the variables that you are using to construct the Date object.

    How can it be the same date? You create a new instance of the Date class.

  3. #3
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    Default Re: whats wrong? help to newbie

    +this.day
    will never change the day. I provided a link below explaining more.
    Operators (The Java™ Tutorials > Learning the Java Language > Language Basics)

  4. The Following User Says Thank You to Tjstretch For This Useful Post:

    ribhoo (November 28th, 2011)

  5. #4
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    Default Re: whats wrong? help to newbie

    here is the whole code:
     
    public class Date
    {
     
     
        private int day;
        private int month;
        private int year;
     
     
        public Date( int day, int month, int year)
        {
            this.day=day;
            this.month=month;
            this.year=year;
         }
     
     
     
        public Date(Date d )
        {  
            this.day=d.day;
            this.month=d.month;
            this.year=d.year;
        }
     
        public int getDay()
        {
            return this.day;
        }
     
         public int getMonth()
        {
            return this.month;
        }
     
        public int getYear()
        {
            return this.year;
        }
     
         public void setDay(int day)
        {
            this.day=day;
        }
     
         public void setMonth(int month)
        {
            this.month=month;
        }
     
         void setYear(int year)
        {
            this.year=year;
        }
     
        public String toString()
        {
            String stDay=""+this.day;
            if (this.day<10)
                stDay="0"+this.day; 
            String stMon=""+this.month;
            if (this.month<10)
                 stMon="0"+this.month;
            return ("date: "+stDay+"/"+stMon+"/"+this.year);
        }
     
       public Date nextDay()
       { int newDay=this.day, newMonth=this.month, newYear=this.year;
            if ((this.month == 1) || (this.month == 3) || (this.month == 5) || (this.month == 7) || (this.month == 8) || (this.month == 10)){
               if (newDay < 31)
               newDay = +this.day;
               else
               newDay = 01;
               newMonth = +this.month;
            }
            if ((this.month == 4) || (this.month == 6) || (this.month == 9) || (this.month == 11)){
              if (this.day < 30)
              newDay = +this.day;
              if (this.day == 30)
              newDay = 01;
              newMonth = +this.month;
            }
            if (this.month == 2){
              if (this.day < 28)
               newDay = +this.day;
              if (this.day == 28)
               newDay = 01;
               newMonth = +this.month;
              if (((this.year%4 == 0) && (this.year%100!=0) || (this.year%400==0)) && (this.day==28))
              newDay = +this.day;
            }
            if (this.month == 12){
               if (this.day < 31)
               newDay = +this.day;
               if (this.day == 31)
               newYear = +this.year;
               newMonth = 01;
               newDay = 01;
            }   
         return new Date(newDay, newMonth, newYear);
        }

    I'm using bluej so I can create an object with parameters and trying to do nextDay, getting the same date that I set in object before

  6. #5
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    Default Re: whats wrong? help to newbie

    Quote Originally Posted by Tjstretch View Post
    +this.day
    will never change the day. I provided a link below explaining more.
    Operators (The Java™ Tutorials > Learning the Java Language > Language Basics)
    thanks, now when I'm changed the code to
    ++this.day
    I'm getting +2
    tried with date 3 1 85 and got 5 3 85

  7. #6
    Super Moderator Norm's Avatar
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    Default Re: whats wrong? help to newbie

    Add some printlns to your program to show the problem.
    Print out the values of all the variables that you are using to show their values before and after.
    Add some comments describing what is wrong with the printed output.

    Also the java SE has a class named: Date.
    It would be less confusing to anyone reading your code if you chose a unique name for your class.

  8. #7
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    Default Re: whats wrong? help to newbie

    ok, so I found the problem now it's work
    here is the code:
    { int newDay=this.day, newMonth=this.month, newYear=this.year;
            if ((this.month == 1) || (this.month == 3) || (this.month == 5) || (this.month == 7) || (this.month == 8) || (this.month == 10)){
               if (this.day < 31){
               newDay = ++this.day;
            }
               if (this.day == 31){
               newDay = 01;
               newMonth = ++this.month;
            }
            }

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