CIS 3120
Design and Implementation of Software Applications I
Lab 2

What to Do

1. Start with the Coin class example :

public class Coin {
   public static final int HEADS = 0 ; 
   public static final int TAILS = 1 ; 
   private int face ;     
   private int value ;   
    
   public Coin(int value) {
      this.value = value ; 
      flip(); 
   } 

   public void flip() {
      face = (int) (Math.random() * 2); 
   }
    
   public int getFace() { return face; }

   public int getValue() { return value; }

   public String toString() {
      String facename; 
      if( face == HEADS ) {
         facename = "heads"; 
      }
      else {
         facename = "tails";
      }
      return ( Integer.toString(value) + " cent coin, face: " + facename ); 
   }
}
			

2. Save this class in a separate file, Coin.java
3. Perform a unit test for Coin class (don't do it the same way we did in class)
4. Write a new class called CoinFlip. It will contain a main method which will perform the following:
   • Ask the user to enter 0 for heads and 1 for tails to call a coin flip.
   • Check the user input:
     • If the user didn't enter a number print out "Not a number. Goodbye" and quit the program (with the proper exit status).
       You should use Scanner class methods and catch an exception for this part. Refer to API specification for details).
     • If the user entered a number but not 0 or 1, print "Not a valid number" and keep asking user until a valid imput is provided.
       Do not check user input against number literals 0 and 1. Use Coin class fields HEADS and TAILS.
   • Once the valid input is provided instantiate a Coin object, flip it and check if the face of the coin matches user's guess.
     If so print out "You WIN" else print out "You LOSE". Either way quit the program when you are done (again with the proper exit status).
5. Make sure that when you run Coin, the unit test gets executed and when you run CoinFlip the above program gets executed.
6. Add a printUsage method to the CoinFlip class which will print a few sentences about how the game should be played.
   Modify the main method to call this function whenever the user provides an invalid input.

Additional info: Reading user input using Scanner

What to Submit