COP2250 Assignment 3

Due Thrusday, 5/29 at 6 am.

Create a NetBeans project that will contain all of your homework projects for the rest of the course: Project for Assignments.

Create a package for chapter 5 and create four different main classes in it; one for each part of the assignment.

• Batting average main class
• Area of polygons main class
• Email splitting main class
• Password testing main class

After you create the four main classes, your project will look something like this:

Import each of your main classes into the Menu class. This is the class that is in the username package of your assignment project.

Assignment Menu

Implement a menu in the main method of the Menu class.

• Display a menu to the user, using a JOptionPane dialog.
  
• The user will enter a number from 1 through 4. Depending on the number that is entered, call the main method from one of the main classes that you created in the chapter 5 package.
  • Use a switch statement to decipher the user input and call the appropriate main method.
  • For example, if the user selects 1, then call Batting.main(args);
  • If the user enters a number that is not in the menu, then print an appropriate message and use System.exit(0)to end the program.
    

Batting Average

For the main method in the Batting main class, do the following.

• Use JOptionPane dialogs to read two integers from the user.
  • One integer will be the number of times the player was at the plate.
  • If the number of times at the plate is less than 0, then print an appropriate message and use System.exit(0)to end the program.
  • One integer will be the number of hits that a baseball player had.
  • If the number of hits is less than 0, then print an appropriate message and use System.exit(0)to end the program.
  • If the number of hits is greater than the number of times at the plate, then print an appropriate message and use System.exit(0)to end the program.
• Calculate the average for the player as (total hits)/(total times at plate).
• Use a JOptionPane dialog to display the players average to three decimal places.
  • Use a DecimalFormat to limit the average to three decimal places and always show three deciamal places.
    • For example, if the user has 100 hits in 300 plate appearances, then the average will be .333
    • If the player has 90 hits in 300 times at the plate, then the average will be .300.
  • Use a complete sentence that includes the number of hits and the number of plate appearances.
  • If the average is greater than .300, then add a statement that the player is elligible for the all-star game.

Polygon Area

For the main method in the Area main class, do the following.

• Calculate the area of a square that has a side of 0.666666667.
• Use a JOptionPane dialog to display the area. Use a complete sentence that includes the length of the side of the square.
• Calculate the area of a rectangle with sides of 4 and 1/9.
• Use a JOptionPane dialog to display the area. Use a complete sentence that includes the length and the width of the rectangle.
• Use a JOptionPane dialog to display the difference between the two calculations.
• Declare a constant threshold that can be used to test if two doubles are equal.
• Use an if statement and the threshold to test if the two areas are equal. Display an appropriate message in a dialog.

Email Address

For the main method in the Email main class, do the following.

• Use a JOptionPane dialog to read an email address from the user.
• If any of the following tests fail, then display an appropriate message and use System.exit(0)to end the program.
  • The string must contain an @ sign.
  • The string must not contain more than one @ sign.
  • The @ sign cannot be the first or last character in the string.
• Use a JOptionPane dialog to display the user name and the domain of the email address as separate strings.
  

Password Test

For the main method in the Password main class, do the following.

• Use a JOptionPane to read a password from the user.
• Use a JOptionPane to read the password again from the user.
• Use a JOptionPane to display one of the following messages, based on the values that the user entered.
  • The two passwords point to the same location in memory.
  • The two passwords contain the same value.
  • The two passwords are not equal.
• When displaying the message, use a complete sentence that includes the two passwords that the user entered.

Submit Homework

To hand in the assignment, upload the JAR file online: Submitting homework on-line via the Web.

• Upload the file as binary.
• Be sure that the JAR file contains the .java files. Check this page for more information: Submitting JAR Files