Question

JAVA programing

Question 1 (Date Class):                                                                                                     5 Points

Create a class Date with the day, month and year fields (attributes).

1. Provide constructors that:
   1. A constructor that takes three input arguments to initialize the day, month and year fields.

Note 1: Make sure that the initialization values for the day, month and year fields are valid where the day must be between 1 and 31 inclusive, the month between 1 and 12 inclusive and the year a positive number.

Note 2: Make sure to handle the case of a leap year properly.

Note 3: If the values are outside their range, the constructor must throw an exception of type IllegalArgumentExcepetion as follows:

throw new IllegalArgumentExcepetion(“INVALID INITIALIZATION VALUES!”);

2. A no-argument (parameterless) constructor that calls the two-argument constructor to initialize the day, month and year fields to their default values.

2. Provide a getter (accessor) and a setter (mutator) methods to each field.

Note 4: Make sure that the initialization values for the day, month and year fields in the setter methods are valid. If the values are invalid, the setter method must throw an exception of type IllegalArgumentExcepetion as follows:

        throw new IllegalArgumentExcepetion(“INVALID INITIALIZATION VALUES!”);

3. Override the toString() method to print the data using the MM/DD/YYYY format:

February 02, 2020

Note 5: I am assuming that the Rectangle object contains day, month and year fields are set to 2, 2 and 2020 values, respectively.

Note 6: Make sure to keep the same method signature when overriding:

public String toString()

4. Override the equals() method to return true if the Date object and the referenced Date object have the same values for day, month and year.

Note 5: Make sure to keep the same method signature when overriding:

public boolean equals(Date ref)

5. Write a test class called: Test_Date where:
   1. You create two references of type Date.
   2. Prompt the user to enter the values for the day, month and year fields to create two Date objects.
   3. Print the content of the two Date objects by calling their toString() methods.
   4. Compare the two Date objects by calling the equals() method in the first Date object.

Hint: A leap year is:

1. Every year that is evenly divisible by 4
2. Except if it is evenly divisible by 100...
3. Unless it is also divisible by 400

Examples:

1. 1997 is not a leap year
2. 1996 is a leap year
3. 1900 is not a leap year
4. 2000 is a leap year

You should write a method to test whether a year is leap or not:

public Boolean isLeapYear(int year)

// Put your Date class here!!!

// Put your Test_Class class here!!!

Answer 1

CODE IN JAVA:

Date.java file:

public class Date {
   private int day ;
   private int month ;
   private int year ;
  
   public Date(int day, int month, int year) {
       validateDate(day, month, year);
   }
   public Date() {
       this.day = 1;
       this.month = 1;
       this.year = 2020 ;
   }
  
   public int getDay() {
       return day;
   }
   public void setDay(int day) {
       validateDate(day, this.month, this.year);
   }
   public int getMonth() {
       return month;
   }
   public void setMonth(int month) {
       validateDate(this.day, month, this.year);
   }
   public int getYear() {
       return year;
   }
   public void setYear(int year) {
       validateDate(this.day, this.month, year);
   }
  
   @Override
   public String toString() {
       return day + "-" + month + "-" + year ;
   }
  
  
   public boolean equals(Date ref) {
       if(this.day == ref.day && this.month == ref.month && this.year == ref.year)
           return true;
       return false;
   }
   private void validateDate(int day, int month, int year) {

       if(month < 1 || month > 12) {
           throw new IllegalArgumentException("INVALID INITIALIZATION VALUES!");
       }
       else {
           if(month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
               if(day >= 1 && day <= 31) {
                   this.day = day ;
                   this.month = month ;
                   this.year = year ;
               }
               else {
                   throw new IllegalArgumentException("INVALID INITIALIZATION VALUES!");
               }
           }
           else if(month == 4 || month == 6 || month == 9 || month == 11) {
               if(day >= 1 && day <= 30) {
                   this.day = day ;
                   this.month = month ;
                   this.year = year ;
               }
               else {
                   throw new IllegalArgumentException("INVALID INITIALIZATION VALUES!");
               }
           }
           else {
               if(isLeapYear(year)) {
                   if(day >= 1 && day <= 29) {
                       this.day = day ;
                       this.month = month ;
                       this.year = year ;
                   }
                   else {
                       throw new IllegalArgumentException("INVALID INITIALIZATION VALUES!");
                   }
               }
               else {
                   if(day >= 1 && day <= 28) {
                       this.day = day ;
                       this.month = month ;
                       this.year = year ;
                   }
                   else {
                       throw new IllegalArgumentException("INVALID INITIALIZATION VALUES!");
                   }
               }
           }
       }
      
  
   }
   private boolean isLeapYear(int year) {
       return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
   }
}

TestDate.java file:

import java.util.Scanner ;
public class TestDate {

   public static void main(String[] args) {
      
       Scanner sc = new Scanner(System.in);
       int day , month, year;
       System.out.print("Enter day of Date1 : ");
       day = sc.nextInt();
       System.out.print("Enter month of Date1 : ");
       month = sc.nextInt();
       System.out.print("Enter year of Date1 : ");
       year = sc.nextInt();
       Date date1 = new Date(day, month, year);
      
       System.out.print("Enter day of Date2 : ");
       day = sc.nextInt();
       System.out.print("Enter month of Date2 : ");
       month = sc.nextInt();
       System.out.print("Enter year of Date2 : ");
       year = sc.nextInt();
       Date date2 = new Date(day, month, year);
       System.out.println("Date1 : " + date1);
       System.out.println("Date2 : " + date2);
       if(date1.equals(date2))
           System.out.println("Both the dates are equal");
       else
           System.out.println("Both the dates are not equal");

   }

}

OUTPUT: