Question

I need to create a Java class file and a client file that does the following:

 Ask user to enter Today’s date in the form (month day year): 2 28 2018

 Ask user to enter Birthday in the form (month day year): 11 30 1990

 Output the following: The date they were born in the form (year/month/day). The day of the week they were born (Sunday – Saturday). The number of days between their birthday and today’s date (their age in days). Example: You were born on 1990/11/30, which was a Friday. You are 9952 days old.

The date they were born in the form (year/month/day). The day of the week they were born (Sunday – Saturday). The number of days between their birthday and today’s date (their age in days).

Example: You were born on 1990/11/30, which was a Friday. You are 9952 days old.

To do this you will need to design, implement and test a Java class file, Date.java:

In order to this I've created a Java class but there's an error with the last three methods in the class:

public class Date {
   private int year, month, day;

   public Date(int yr, int mnth, int dy) {
       this.year = yr;
       this.month = mnth;
       this.day = dy;
   }

   public Date() {
       this.year = 1753;
       this.month = 1;
       this.day = 1;
   }

   public int getYear() {
       return this.year;
   }

   public int getMonth() {
       return this.month;
   }

   public int getDay() {
       return this.day;
   }

   public String toString() {
       return "" + this.year + "/" + this.month + "/" + this.day;
   }

   public boolean equals(Date otherDate) {
       if ((otherDate.getDay() == this.day) && (otherDate.getMonth() == this.month)
               && (otherDate.getYear() == this.year)) {
           return true;
       } else {
           return false;
       }
   }

   public boolean isLeapYear(int year) {
       return ((year % 4) == 0) && !((year % 100 == 0) || (year % 400 != 0));
   }

   public void nextDay() {

       //mutator method that advances this Date object’s fields to represent the next date

       //nextDay() advances this Date object’s day, month and/or year, as needed

      

       //Months that have 31 days

       if(this.month==10 || this.month==8 || this.month==7 || this.month==5

               || this.month==3 || this.month==1) {

           if(this.day==31) {

               this.month++;

               this.day=1;

           } else {

               this.day++;

           }

       }

       //Months that have 30 days

       if(this.month==11 || this.month==9 || this.month==6 || this.month==4) {

           if(this.day==30) {

               this.month++;

               this.day=1;

           }else {

               this.day++;

           }

       }

       //Only for month of December

       if(this.month==12) {

           if(this.day==31) {

               this.year++;

               this.month=1;

               this.day=1;

           } else {

               this.day++;

           }

       }

       //Only for month of Feb.

           if(this.month==2) {

               if(isLeapYear(year)==true) {

                   if(this.day==29) {

                       this.month++;

                       this.day=1;

                   }else {

                       this.day++;

                   }

               }else if(isLeapYear(year)==false) {

                   if(this.day==28) {

                       this.month++;

                       this.day=1;

                   }else {

                       this.day++;

                   }

               }

           }

       }
   public int advanceTo(Date endDate){
   //Initializes the increment to 0
   int counterDate = 0;
   //Increments the counter and uses nextDay() until the counterdate equals the end date.
while (!this.equals(endDate)) {
nextDay();
counterDate++;
}
//Returns the Counter amount
return counterDate;
   }
  
   public String getDayOfWeek(){
   //Creates an array with the weekdays in it.
   String[] weekDays = { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday" };
   // returns whichever day that the day is advanced to, modulo 7 because
   // that'll give us an appropriate index in the array
   Date refernceDate = new Date(1753,1,1);
   return weekDays[refernceDate.advanceTo(this) % 7];
   }

}

Can you help me fix these last three methods so that I get the correct input?

Answer 1

Please find correct days of week function: I have tested it is working.

String getDayOfWeek(){
    //Creates an array with the weekdays in it.
    String[] weekDays = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" };
    int[] t = {0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4};
    int y = this.year;
    int m = this.month;
    y -= (m < 3) ? 1 : 0;

    int dayCode = ( y + y/4 - y/100 + y/400 + t[m-1] + this.day) % 7; //0 for Sunday, 1 for Monday, etc.
    return weekDays[dayCode];
}