Question

Specification

Modify a Java application that prints the value of the mathematical constant Pi.

Copy the PiDay.java program and do the following:

• implement the abstract methods that are declared in abstract class Number;
• implement the two methods marked "TBI (To Be Implemented)" in PiDay.java;
• answer the three questions/exercises presented in the program's file comment block.

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

/*
 * PiDay is-a a Number.
 *
 * @creator gdt
 * @created 02017.02.26
 * @updated 02019.01.30
 *
 * Answer the following questions here in this file comment block
 * prior to submitting this file to the instructor.
 *
 * (0) No or Yes: PiDay objects are immutable.  
 *     REPLACE_THIS_TEXT_WITH_YOUR_ANSWER
 *
 * (1) Record what the expression  (new PiDay().getPi() == PiDay.PI)
 *     evaluates to and briefly explain why.
 *     REPLACE_THIS_TEXT_WITH_YOUR_ANSWER
 *
 * (2) Briefly explain why the  byteValue()  and  shortValue()
 *     methods that are defined in abstract class Number
 *     did not need to be implemented in class PiDay.
 *     REPLACE_THIS_TEXT_WITH_YOUR_ANSWER
 */

public class PiDay extends Number {

   private final static double PI = 3.14159265358979323846264338327950;
   private int intValue;        // PI rounded down to nearest int
   private long longValue;      // PI rounded up to nearest int
   private float floatValue;    // PI stored as a float
   private double doubleValue;  


   /*
    * TBI (To Be Implemented)
    * The constructor assigns values to all of the instance 
    * variables defined above. The values that are assigned
    * to the instance variables are documented using comments
    * when the instance variables are defined.
    */
   public PiDay() {
      // the expressions on the right side of each of the following 
      // assignment expression statements must use PI in them...
      intValue = ;
      longValue = ;
      floatValue = ;
      doubleValue = ;
   }

   /*
    * TBI (To Be Implemented)
    * Returns a String representation of this Pi object
    * that is used as the output of this progam.
    */
   public String toString() {
   }

   /*  
    * The main() and getPi() methods cannot be modified.
    */
   public static void main(String[] argv) {
      System.out.println(new PiDay());
   }

   public double getPi() { return doubleValue; }


}

/*
 * the output of your program must match the following
 *

byteValue():  3
shortValue():  3
intValue():  3
longValue():  4
floatValue():  3.1415927
doubleValue():  3.141592653589793

 *
 */

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

The output of your program must match the following:

byteValue():  3
shortValue():  3
intValue():  3
longValue():  4
floatValue():  3.1415927
doubleValue():  3.141592653589793

Answer 1

/*
 * PiDay is-a a Number.
 *
 * @creator gdt
 * @created 02017.02.26
 * @updated 02019.01.30
 *
 * Answer the following questions here in this file comment block
 * prior to submitting this file to the instructor.
 *
 * (0) No or Yes: PiDay objects are immutable.
 *     REPLACE_THIS_TEXT_WITH_YOUR_ANSWER
 *
 * (1) Record what the expression  (new PiDay().getPi() == PiDay.PI)
 *     evaluates to and briefly explain why.
 *     REPLACE_THIS_TEXT_WITH_YOUR_ANSWER
 *
 * (2) Briefly explain why the  byteValue()  and  shortValue()
 *     methods that are defined in abstract class Number
 *     did not need to be implemented in class PiDay.
 *     REPLACE_THIS_TEXT_WITH_YOUR_ANSWER
 */

public class PiDay extends Number {

    private final static double PI = 3.14159265358979323846264338327950;
    private int intValue;        // PI rounded down to nearest int
    private long longValue;      // PI rounded up to nearest int
    private float floatValue;    // PI stored as a float
    private double doubleValue;


    /*
     * TBI (To Be Implemented)
     * The constructor assigns values to all of the instance
     * variables defined above. The values that are assigned
     * to the instance variables are documented using comments
     * when the instance variables are defined.
     */
    public PiDay() {
        // the expressions on the right side of each of the following
        // assignment expression statements must use PI in them...
        intValue = (int) PI;
        longValue = (long) Math.ceil(PI);
        floatValue = (float) PI;
        doubleValue = PI;
    }

    @Override
    public int intValue() {
        return intValue;
    }

    @Override
    public long longValue() {
        return longValue;
    }

    @Override
    public float floatValue() {
        return floatValue;
    }

    @Override
    public double doubleValue() {
        return doubleValue;
    }

    /*
     * TBI (To Be Implemented)
     * Returns a String representation of this Pi object
     * that is used as the output of this progam.
     */
    public String toString() {
        return "byteValue():  " + byteValue() + "\n" +
                "shortValue():  " + shortValue() + "\n" +
                "intValue():  " + intValue() + "\n" +
                "longValue():  " + longValue() + "\n" +
                "floatValue():  " + floatValue() + "\n" +
                "doubleValue():  " + doubleValue();
    }

    /*
     * The main() and getPi() methods cannot be modified.
     */
    public static void main(String[] argv) {
        System.out.println(new PiDay());
    }

    public double getPi() {
        return doubleValue;
    }


}

/*
 * the output of your program must match the following
 *

byteValue():  3
shortValue():  3
intValue():  3
longValue():  4
floatValue():  3.1415927
doubleValue():  3.141592653589793

 *
 */