Display a line graph representing the number of A's, B's, C's, D's and F's on the
Java Programming Final Examination.
Decide how the window will look. We need 5 labeled areas to
receive user input.
Label LabelA = addLabel("A", 1,1,1,1);
IntegerField FieldA = addIntegerField(0,1,2,1,1);
Divide the top of the window into the Labeled areas
and the Field areas for the user input.
word GRAPH is going to appear on the left side of the window such
that when clicked will
display a menu of choices. Right now, our only choice
will be Line (for Line Graph).
MenuItem lineChoice = addMenuItem("Graph", "Line");
upon the coordinates of the placement of the graph in the window.
We will need the
x-coordinate of the left side and the right side, as well as the
y-coordinate of the top and the bottom of our grid.
4. Establish a "constructor" to set the initial values in the program.
See the example demo.
constructor is a special type of method that creates
a new object. It has the same name as its class
and has no return value. The basic function of a
method is to execute code, while the only purpose of a
constructor is to create an instance of a class.
5. Use the paint method to draw the graph.
6. Draw the graph such that:
letter grades are placed along the x-axis
frequency numbers are placed along the y-axis
a dot is drawn at
each grade value
the dots are connected
to form a line graph
Methods will be
used for procedures that will eventually be shared by
all three graphing options - line graph, bar graph, and
The y-scale values can not exceed
the number of pixels used to create the y-axis.