4. Mod 1. Modify the constructor for the main class in this program:
• Within this constructor, add a call to the constructor of the parent class (the
JFrame class) passing the string "Histogram Demonstration" as parameter. This
will cause the string to be displayed in the window's title bar. This call to the
parent constructor must be the first statement in the current constructor. The new
additional statement consists of:
super(“Histogram Demonstration”);

• Modify the text of the TitledBorder that is used for the top JPanel. Add text to
the title that informs the user as to:
i. The maximum number of data numbers that can be entered. Currently, the
maximum number of data values is set at 50. You should not change this.
ii. The maximum value that can be entered for each data number. Use the
width of histogram rectangular area, which is 300, as the maximum value that
can be entered for any data value.
When you do this step, use appropriate variables in your code; do not use
literals in the statements that specify the text of the TitledBorder.

• Add a call to the createColorList method described in Step 6, Mod 3, below.

5. Mod 2. Write a method named createColorList.

1. This method must create an array, named color, consisting of six
different colors to be used to display the histogram bars in different
colors. Be sure to create pleasing colors.

2. Note that the color array is already declared as a member variable
of the main class.

3. Use a constructor from the Color class to create each color. Do not
use the predefined colors in the Color class.

4. This method does not need a loop. You can simply assign a Color
object to each array cell. For example: color[0] = new Color(255, 0,
150);

5. In the constructor mentioned in the above Mod, add a call to the
createColorList method.

6. Mod 3. You can eliminate the use of the JOptionPane dialog.
1. • You can eliminate the JOptionPane dialog since the data numbers will
be displayed on the histogram along with each corresponding histogram
bar.

Mod 4. Make the histogram fit within a fixed display area.

1. Implement the program so that it displays the histogram within a
square area that has a fixed size of 300 x 300 pixels. The variables
histogramWidth and histogramHeight are already declared in the main
class.

2. The histogram must be limited to this display area regardless of the
number of data numbers entered for display. In general, the more data
numbers that are entered by the user, the thinner the histogram bars
will be (so as to fit within the fixed area). This is not the ideal
approach, of course; see Extra Credit part B.

3. The next Mod below provides details on the histogram display
code.

8. Mod 5. Write the paintComponent method in the MyPanel class. The
paintComponent method must do the following:
1. Set the background color to white.

1. Declare variables within the paint method to hold items such as:
1. The thickness of the histogram bars.
2. The starting x coordinate and starting y coordinate for display
of all the items to be drawn on the panel.
3. Use (30, 70) for the upper left corner of the histogram square
display area.

2. Use the above variables as parameters when calling methods such as g.
drawString and g.fillRect. Do not use literals as parameters to these
methods.

3. Create a font consisting of the Helvetica font face, bold style, and size
24.

4. Create another font, as in the previous step above, but with size 16.

5. Display a heading within the panel consisting of: "Histogram
Demonstration". The heading should be displayed using the larger font that
you created in the step above. The heading should be displayed starting at the location (30, 40).

6. Below the above heading, display a another line of text consisting of:
“The number of data elements is:”, followed on the same line by the count
of the data values entered by the user. This second text line should be
displayed using the smaller font that you created in the above step.

1. Add a for-loop that draws the horizontal bars of the histogram. The
for-loop must do the following in each pass through the loop body.
During the i-th pass:

1. Draw the i-th bar of the histogram. That is, draw a filled
rectangle whose horizontal width is equal to the i-th number in
the array of data numbers entered by the user and whose height is
equal to the thickness variable mentioned above. The positioning
values (expressions) for each bar must not contain any literals;
use the variables instead.

2. The i-th bar (mentioned above) must be displayed in the i-th
color in the color array. If the user has entered more than 6 data
numbers to be displayed, the colors in the array must be re-used
in a “round robin” manner. That is, each time the color list is
exhausted, start at the beginning of the list again. This means, for
example, that color number 0 is used again for data number 6,
color number 1 again for data number 7, color 2 again for data
number 8, etc.

3. Draw a black outline (edge) around each histogram bar.

4. The left ends of all the bars must line up vertically; use your
start x variable (e.g., with a value of 30) as the position of the left
end of each bar.

5. To the right of each bar, print the value of the data number
that is represented by the bar's horizontal dimension. Use the
smaller font that you created to print these numbers.

6. Make sure that your display of the text and histogram is
pleasing and attractive.