Question

Overloaded Constructors

1. Add a pair of constructors to the Height class that implement the initializations provided by the two setHeight operations in Figure 7.11. Minimize the total number of statements by having the one parameter constructor call the one-parameter setHeight method and having the two-parameter constructor call the two-parameter setHeight method.

2. Provide a complete rewritten main method for the HeightDriver class such that the new method uses one of the new constructors from part a) to generate this output:

6.0 ft

/***********************************************************

* Height.java

* Dean & Dean

*

* This class stores and prints height values.

***********************************************************/

class Height

{

double height; // a person's height

String units; // like cm for centimeters

//********************************************************

public void setHeight(double height)

{

    this.height = height;

    this.units = "cm";

}

//********************************************************

public void setHeight(double height, String units)

{

    this.height = height;

    this.units = units;

  }

//********************************************************

public void print()

{

    System.out.println(this.height + " " + this.units);

}

} // end class Height

/*******************************************************************

* HeightDriver.java

* Dean & Dean

*

* This class is a demonstration driver for the Height class.

*******************************************************************/

public class HeightDriver

{

public static void main(String[] args)

{

    Height myHeight = new Height();

    myHeight.setHeight(72.0, "in");

    myHeight.print();

    myHeight.setHeight(180.0);

    myHeight.print();

} // end main

} // end class HeightDriver

Answer 1

Below is your code:

HeightDriver.java

/***********************************************************
 * 
 * Height.java
 * 
 * Dean & Dean
 * 
 *
 * 
 * This class stores and prints height values.
 ***********************************************************/

class Height

{

        double height; // a person's height

        String units; // like cm for centimeters

        // ******************************************************

        // 1-Parameter Constructor
        public Height(double height) {
                this.setHeight(height);
        }

        // ******************************************************

        // ******************************************************

        // 2-Parameter Constructor
        public Height(double height, String units) {
                this.setHeight(height, units);
        }

        // ******************************************************

        // ********************************************************

        public void setHeight(double height)

        {

                this.height = height;

                this.units = "cm";

        }

        // ********************************************************

        public void setHeight(double height, String units)

        {

                this.height = height;

                this.units = units;

        }

        // ********************************************************

        public void print()

        {

                System.out.println(this.height + " " + this.units);

        }

} // end class Height

/*******************************************************************
 * 
 * HeightDriver.java
 * 
 * Dean & Dean
 * 
 *
 * 
 * This class is a demonstration driver for the Height class.
 *******************************************************************/

public class HeightDriver

{

        public static void main(String[] args)

        {

                Height myHeight = new Height(6, "ft");

                // myHeight.setHeight(72.0, "in");
                //
                // myHeight.print();
                //
                // myHeight.setHeight(180.0);

                myHeight.print();

        } // end main

} // end class HeightDriver

Below are the screenshots of the code changed. Heighlighted part is the changed code

Output

6.0 ft