Suppose that the text file on the Web http://cs.armstrong.edu/liang/data/Scores.txt contains an unspecified number of scores. Write a program that reads...

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  1. Suppose that the text file on the Web http://cs.armstrong.edu/liang/data/Scores.txt contains an unspecified number of scores. Write a program that reads the scores from the file and displays their total and average. Scores are separated by blanks.
     

  2. In a triangle, the sum of any two sides is greater than the other side. Create an  IllegalTriangleException class. Write a Triangle Class with the constructor of the Triangle class designed to throw an IllegalTriangleException object if a triangle is created with sides that violate the rule, as follows:

    /** Construct a triangle with the specified sides */
    public Triangle(double side1, double side2, double side3) {
       throws IllegalTriangleException 
           // Implement it
    }
     

  3. (Plot functions using abstract methods) Write an abstract class that draws the diagram for a function. The class is defined as follows:


        abstract class AbstractDrawFunction extends JPanel {

/** Polygon to hold the points */

private Polygon p = new Polygon();

final int TO_X_AXIS = 125;

final int TO_Y_AXIS = 125;

final int END_OF_X_AXIS = 275;

final int END_OF_Y_AXIS = 200;

 

protected AbstractDrawFunction () {

drawFunction();

setBackground(Color.white);

}

 

/** Return the y-coordinate */

abstract double f(double x);

 

/** Obtain points for x-coordinates 100, 101, . . ., 300 */

public void drawFunction() {

for (int x = -100; x <= 100; x++) {

p.addPoint(x + TO_Y_AXIS, TO_X_AXIS - (int)f(x));

}

}

 

@Override /** Draw axes, labels, and connect points */

protected void paintComponent(Graphics g) {

   super.paintComponent(g);

 

   // Draw x axis

   g.drawLine(10, TO_X_AXIS, END_OF_X_AXIS, TO_X_AXIS);

 

   // Draw y axis

   g.drawLine(TO_Y_AXIS, 30, TO_Y_AXIS, END_OF_Y_AXIS);

 

   // Draw arrows on x axis

   g.drawLine(END_OF_X_AXIS, TO_X_AXIS, END_OF_X_AXIS - 20, TO_X_AXIS - 10);

   g.drawLine(END_OF_X_AXIS, TO_X_AXIS, END_OF_X_AXIS - 20, TO_X_AXIS + 10);

 

   // Draw arrows on y axis

   g.drawLine(TO_Y_AXIS, 30, TO_Y_AXIS - 10, 50);

   g.drawLine(TO_Y_AXIS, 30, TO_Y_AXIS + 10, 50);

 

   // Draw x, y

   g.drawString("X", END_OF_X_AXIS - 20, TO_X_AXIS - 30);

   g.drawString("Y", TO_Y_AXIS + 20, 40);

 

   // Draw a polygon line by connecting the points in the polygon

   g.drawPolyline(p.xpoints, p.ypoints, p.npoints);

 

}

}

 

public class draw_graph extends JFrame {

    public static void main(String[] arg) {

        draw_graph dg = new draw_graph();

        dg.setSize(400,400);

        dg.setTitle("Graph");

        dg.setLocationRelativeTo(null);

        dg.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        dg.setVisible(true);

        

    }

    

    draw_graph () {

        setLayout(new GridLayout(1, 3, 1, 1));

        // Create your derived class object here

        

    }

 

}

 

Test the class with the following functions defined in concrete classes:

a. f(x) = x*x;

b. f(x) = sin(x);

c. f(x) = cos(x);

d. f(x) = tan(x);

e. f(x) = cos(x) + 5*sin(x);

f. f(x) = 5*cos(x) + sin(x);o

g. f(x) = log(x) + x*x;

 

For each function, create a class that extends the AbstractDrawFunction

class and implements the f method.

 

Your output should consist of screen shots of plots for these functions with the label of the plot as your name_idnumber.

 

    • Posted: 4 years ago
    • Budget: $999999.99