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Why isnt my MyCalender.java working? class MyCalender.java : package calenderapp; import java.util.Scanner; public class MyCalender {...

Why isnt my MyCalender.java working?

class MyCalender.java :


package calenderapp;

import java.util.Scanner;

public class MyCalender {
MyDate myDate;
Day day;
enum Day {
Monday,
Tuesday,
Wednesday,
Thursday,
Friday,
Saturday,
Sunday
}
  
public static void main(String[] args) {
Scanner sc= new Scanner(System.in);
System.out.println("Enter date below :");
System.out.println("Enter day :");
int day = sc.nextInt();
System.out.println("Enter Month :");
int month = sc.nextInt();
System.out.println("Enter year :");
int year = sc.nextInt();
MyDate md = new MyDate(day, month, year);
if(!md.isDateValid()){
System.out.println("\n Invalid date . Try again. ");
return;
}
MyCalender mc = new MyCalender(md);
System.out.println("\nDay of week :"+ mc.dayOfWeek());
System.out.println("\nWeek of month :" + mc.weekOfMonth());
System.out.println("\nCalender :\n");
mc.printCalender();
  
}
  
MyCalender(MyDate md){
this.myDate = md;
this.day = dayOfWeek();
}
  
Day dayOfWeek(){
int h;
int q = myDate.day;
int m = myDate.month;
if(m == 1) m = 13;
if(m == 2) m = 14;
int k = myDate.year % 100;
if(m==13 || m== 14) k= k-1;
int j = myDate.year / 100;
if(m== 13 || m== 14) j = j-1;
  
double d1 = (double)(13* (m+1))/(double) 5;
double d2 = (double)k / (double)4;
double d3 = (double)j / (double)4;
  
h = q+ (int)d1 + k + (int)d2 + (int)d3 + (5*j);
h = h % 7;
switch(h){
case 0 : return Day.Saturday ;
case 1 : return Day.Sunday;
case 2 : return Day.Monday;
case 3 : return Day.Tuesday;
case 4 : return Day.Wednesday;
case 5 : return Day.Thursday;
case 6 : return Day.Friday;
default : return null;
}
}
  
int weekOfMonth(){
MyDate newDate = new MyDate(1, myDate.month, myDate.year);
Day d = new MyCalender(newDate).dayOfWeek();
int dd = -1;
switch(d){
case Saturday : dd = 6; break;
case Sunday : dd = 0; break;
case Monday : dd = 1; break;
case Tuesday : dd = 2; break;
case Wednesday : dd = 3; break;
case Thursday : dd = 4; break;
case Friday : dd = 5; break;
default : dd = -1; break;
}
int weekOfMonth = 1;
int count = 0;
for(int i =1; i<= dd; i++){
count++;
}
for(int i =0; i<=myDate.day; i++){
if(count % 7 == 0){
weekOfMonth ++;
}
count++;
}
return weekOfMonth;
}
  
void printCalender(){
int daysInMonth = 0;
int year = myDate.year;
int day = myDate.day;
int month = myDate.month;
  
if(year > 1582 && year < 9999){
if(month ==1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12){
if(day > 0 && day <= 31){
daysInMonth = 31;
}
}
else if(month == 4 || month == 6 || month == 9|| month == 11){
if(day >0 && day <=30){
daysInMonth = 30;
}
}
else {
if(month == 2){
if(year % 400 == 0){
if(day <= 29){
daysInMonth = 29;
}
}
else {
if(day <= 28){
daysInMonth = 28;
}
}
}

}
}
MyDate newDate = new MyDate(1, myDate.month, myDate.year);
Day d = new MyCalender(newDate).dayOfWeek();
int dd = -1;
switch(d){
case Saturday : dd = 6; break;
case Sunday : dd = 0; break;
case Monday : dd = 1; break;
case Tuesday : dd = 2; break;
case Wednesday : dd = 3; break;
case Thursday : dd = 4; break;
case Friday : dd = 5; break;
default : dd = -1; break;
}
int count = 0;
System.out.println("Sun\t Mon\t Tues\t Wed\t Thu\t Fri\t Sat\n");
for(int i =1; i<= dd; i++){
System.out.print("\t");
count++;
}
for(int i =1; i<= daysInMonth; i++){
if(count%7 == 0){
System.out.print("\n");
}
count ++;
System.out.print(i + "\t");
}
System.out.println("\n");
}
}

MyDate.java :


package calenderapp;

public class MyDate {
int day;
int month;
int year;
  
MyDate(int d, int m, int y){
day = d;
month = m;
year = y;
}
int getDay(){
return day;
}
int getMonth(){
return month;
}
int getYear(){
return year;
}
  
boolean isDateValid(){
if(year > 1582 && year < 9999){
if(month ==1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12){
if(day > 0 && day <= 31){
return true ;
}
}
else if(month == 4 || month == 6 || month == 9|| month == 11){
if(day >0 && day <=30){
return true;
}
}
else {
if(month == 2){
if(year % 400 == 0){
if(day <= 29){
return true;
}
}
else {
if(day <= 28){
return true;
}
}
}

}
}
else {
return false;
}
return false;
}
}

engineering   Computer-Science   
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Homework Answers

Answer #1

Please find the updated code below::

MyCalender.java

package classes15;

import java.util.Scanner;

public class MyCalender {
   MyDate myDate;
   Day day;
   enum Day {
       Monday,
       Tuesday,
       Wednesday,
       Thursday,
       Friday,
       Saturday,
       Sunday
   }

   public static void main(String[] args) {
       Scanner sc= new Scanner(System.in);
       System.out.println("Enter date below :");
       System.out.println("Enter day :");
       int day = sc.nextInt();
       System.out.println("Enter Month :");
       int month = sc.nextInt();
       System.out.println("Enter year :");
       int year = sc.nextInt();
       MyDate md = new MyDate(day, month, year);
       if(!md.isDateValid()){
           System.out.println("\n Invalid date . Try again. ");
           return;
       }
       MyCalender mc = new MyCalender(md);
       System.out.println("\nDay of week :"+ mc.dayOfWeek());
       System.out.println("\nWeek of month :" + mc.weekOfMonth());
       System.out.println("\nCalender :\n");
       mc.printCalender();

   }

   MyCalender(MyDate md){
       this.myDate = md;
       this.day = dayOfWeek();
   }

   Day dayOfWeek(){
       int h;
       int q = myDate.day;
       int m = myDate.month;
       if(m == 1) m = 13;
       if(m == 2) m = 14;
       int k = myDate.year % 100;
       if(m==13 || m== 14) k= k-1;
       int j = myDate.year / 100;
       if(m== 13 || m== 14) j = j-1;

       double d1 = (double)(13* (m+1))/(double) 5;
       double d2 = (double)k / (double)4;
       double d3 = (double)j / (double)4;

       h = q+ (int)d1 + k + (int)d2 + (int)d3 + (5*j);
       h = h % 7;
       switch(h){
       case 0 : return Day.Saturday ;
       case 1 : return Day.Sunday;
       case 2 : return Day.Monday;
       case 3 : return Day.Tuesday;
       case 4 : return Day.Wednesday;
       case 5 : return Day.Thursday;
       case 6 : return Day.Friday;
       default : return null;
       }
   }

   int weekOfMonth(){
       MyDate newDate = new MyDate(1, myDate.month, myDate.year);
       Day d = new MyCalender(newDate).dayOfWeek();
       int dd = -1;
       switch(d){
       case Saturday : dd = 6; break;
       case Sunday : dd = 0; break;
       case Monday : dd = 1; break;
       case Tuesday : dd = 2; break;
       case Wednesday : dd = 3; break;
       case Thursday : dd = 4; break;
       case Friday : dd = 5; break;
       default : dd = -1; break;
       }
       int weekOfMonth = 1;
       int count = 0;
       for(int i =1; i<= dd; i++){
           count++;
       }
       for(int i =0; i<=myDate.day; i++){
           if(count % 7 == 0){
               weekOfMonth ++;
           }
           count++;
       }
       return weekOfMonth;
   }

   void printCalender(){
       int daysInMonth = 0;
       int year = myDate.year;
       int day = myDate.day;
       int month = myDate.month;

       if(year > 1582 && year < 9999){
           if(month ==1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12){
               if(day > 0 && day <= 31){
                   daysInMonth = 31;
               }
           }
           else if(month == 4 || month == 6 || month == 9|| month == 11){
               if(day >0 && day <=30){
                   daysInMonth = 30;
               }
           }
           else {
               if(month == 2){
                   if(year % 400 == 0){
                       if(day <= 29){
                           daysInMonth = 29;
                       }
                   }
                   else {
                       if(day <= 28){
                           daysInMonth = 28;
                       }
                   }
               }

           }
       }
       MyDate newDate = new MyDate(1, myDate.month, myDate.year);
       Day d = new MyCalender(newDate).dayOfWeek();
       int dd = -1;
       switch(d){
       case Saturday : dd = 6; break;
       case Sunday : dd = 0; break;
       case Monday : dd = 1; break;
       case Tuesday : dd = 2; break;
       case Wednesday : dd = 3; break;
       case Thursday : dd = 4; break;
       case Friday : dd = 5; break;
       default : dd = -1; break;
       }
       int count = 0;
       System.out.println("Sun\t Mon\t Tues\t Wed\t Thu\t Fri\t Sat\n");
       for(int i =1; i<= dd; i++){
           System.out.print("\t");
           count++;
       }
       for(int i =1; i<= daysInMonth; i++){
           if(count%7 == 0){
               System.out.print("\n");
           }
           count ++;
           System.out.print(i + "\t");
       }
       System.out.println("\n");
   }
}

MyDate.java

package classes15;
public class MyDate {
   int day;
   int month;
   int year;

   MyDate(int d, int m, int y){
       day = d;
       month = m;
       year = y;
   }
   int getDay(){
       return day;
   }
   int getMonth(){
       return month;
   }
   int getYear(){
       return year;
   }

   boolean isDateValid(){
       if(year > 1582 && year < 9999){
           if(month ==1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12){
               if(day > 0 && day <= 31){
                   return true ;
               }
           }
           else if(month == 4 || month == 6 || month == 9|| month == 11){
               if(day >0 && day <=30){
                   return true;
               }
           }
           else {
               if(month == 2){
                   if(year % 400 == 0){
                       if(day <= 29){
                           return true;
                       }
                   }
                   else {
                       if(day <= 28){
                           return true;
                       }
                   }
               }

           }
       }
       else {
           return false;
       }
       return false;
   }
}

output:

Quick AccessJava EE Console X <terminated> MyCalender [Java Application] C:\Program FilesJavare7\bin javaw.exe (May 17, 20 En

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