Create a class called Date212 to represent a date. It will store the year, month and day as integers (not as a String in the form yyyymmdd (such as 20161001 for October 1, 2016), so you will need three private instance variables. Two constructors should be provided, one that takes three integer parameters, and one that takes a String.
The constructor with the String parameter and should validate the parameter. As you are reading the dates you should check that the value read in is legal (8 digits), and if it is not, print it to the console and do not put it in the array of dates., and then use the substring method of class String to pull out the month, day and year, parse them as integers and call the three-argument constructor.
The three-argument constructor should make sure that the month and day values are legal. To call another constructor from within a constructor, use the method this :
public Date212 (String d) { // the one-argument constructor
… this(year, month, day) // invokes the three-argument constructor.
…
}
The dates will be taken from an .txt input file in the format :
20161001
20080912,20131120,19980927
20020202
20120104
ToString() for Class Date212. Create a toString method in class Date212 the will return the date in the form mm/dd/yyyy. Use this method to display the dates in DateGUI.
Java Program:
/* Java Program that reads date string from file and prints in the specified format */
import java.util.*;
import java.io.*;
//Class that holds date
class Date212
{
//Private member variables
private int year;
private int month;
private int day;
//Three argument Constructor
public Date212 (int y, int m, int d)
{
//Validating month
if(m < 1 || m > 12)
System.out.println("\n Invalid month... \n");
//Validating day
else if(d < 1 || d >
31)
System.out.println("\n Invalid day... \n");
else
{
//Assigning
values to member variables
this.year =
y;
this.month =
m;
this.day =
d;
}
}
//Constructor with single argument
public Date212 (String d)
{
//Calling three argument
constructor
this(Integer.parseInt(d.substring(0, 4)),
Integer.parseInt(d.substring(4, 6)),
Integer.parseInt(d.substring(6, 8)));
}
//Method that returns date in the required
format
public String toString()
{
return String.format("%02d", month)
+ "/" + String.format("%02d", day) + "/" + String.format("%04d",
year);
}
}
//Class that test Date212 class
class Date212Driver
{
//Main program
public static void main(String args[])
{
//Array list to hold list of
dates
ArrayList<Date212> dates =
new ArrayList<Date212>();
//Opening file
File file = new
File("birthDates.txt");
try
{
Scanner sc = new
Scanner(file);
//Reading date
from file
while
(sc.hasNextLine())
{
//Reading a line
String temp = sc.nextLine();
//Validating length
if(temp.length() == 8)
{
//Creating an object
Date212 tdate = new
Date212(temp);
//Adding to array list
dates.add(tdate);
}
}
sc.close();
}
catch (FileNotFoundException
e)
{
//Handling
exceptions
e.printStackTrace();
}
//Printing values in array
list
for(int i=0; i<dates.size();
i++)
System.out.println("\n Date: " + dates.get(i) + " \n");
}
}
---------------------------------------------------------------------------------------------------------------------------------------------------------------
Sample Output:
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