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POJava data encapsulation, initializing and postconditions?
 

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  1. POJava data encapsulation, initializing and postconditions?
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    <p>My assignment is to complete the Date class shown below. The Date class encapsulates a date by storing the month, day, and year in private instance variables. </p> <pre><code> public class Date { // declare your instance variables here // postcondition: instance variables are initialized with any valid values // you choose public Date () { } // postcondition: instance variables are initialized with the given values if they are valid // the month instance variable should be between 1-12 // the day instance variable should be between 1-31 // if the parameters are not valid, the instance variables are given different values that are valid public Date(int theMonth, int theDay, int theYear) { } // postcondition: returns a String in the form month/day/year public String toString() { } } </code></pre> <p><strong>The code below is what I have so far.</strong> Frankly, I am pretty confused about what I am supposed to do, and I don't have an instructor to ask. The output is " 2/2/0 " </p> <p>EDIT UPDATE: If I enter a year that is invalid, such as 200, it does not print the error message... My intention with the if statement was to catch errors where the year is not 4 digits. Is this correct? Thank you for any and all help!</p> <pre><code>public class Date { // declare your instance variables here private int myMonth; private int myDay; private int myYear; // postcondition: instance variables are initialized with any valid values // you choose public Date () { myMonth = 11; myDay = 11; myYear = 2011; } // postcondition: instance variables are initialized with the given values if they are valid // the month instance variable should be between 1-12 // the day instance variable should be between 1-31 // if the parameters are not valid, the instance variables are given different values that are valid public Date(int theMonth, int theDay, int theYear) { if ( theMonth &gt;= 1 &amp;&amp; theMonth &lt;= 12 ) { myMonth = theMonth; } else { System.out.print("Month Value invalid; default to 1"); myMonth = 1; } if( theDay &gt;= 1 &amp;&amp; theDay &lt;= 31 ) { myDay = theDay; } else { System.out.print("Day Value invalid; default to 1"); myDay = 1; } if( theYear &lt; 4 ) { System.out.print("Year Value invalid; default to 2000"); myYear = 2000; } else { myYear = theYear; } } // postcondition: returns a String in the form month/day/year public String toString() { return myMonth + "/" + myDay + "/" + myYear; } public static void main(String [] args) { int theMonth, theDay, theYear; theMonth = 2; theDay = 2; theYear = 200; Date date = new Date(theMonth, theDay, theYear); date.toString(); System.out.println(date); } } </code></pre>
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    1. USRenea S.
    1. USRenea S.
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    1. COWhat is the problem?
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      1. POJava data encapsulation, initializing and postconditions?
      1. USJeroen Vannevel
    2. COYou never set `myYear` value to `theYear` value in your constructor if it's `>= 4`. It should be `if( theYear < 4 ) { System.out.print("Year Value invalid; default to 2000"); myYear = 2000; } else { myYear = theYear; }`
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      1. POJava data encapsulation, initializing and postconditions?
      1. USAlexis C.
    3. COThe post-condition requirements do not call for the year to be validated at all, so you do not need to check if it's four digits or more.
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      1. POJava data encapsulation, initializing and postconditions?
      1. USdasblinkenlight
 

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