Using the Coin Class

The Coin class from Listing 4.2 in the text is in the file Coin.java. Copy
it to your directory, then write a program to find the length of the
longest run of heads in 100 flips of the coin. A skeleton of the program is
in the file Runs.java. To use the Coin class you need to do the following
in the program:

   * Import the Coin class.
   * Create a coin object.
   * Inside the loop, you should use the flip method to flip the coin, the
     toString method (used implicitly) to print the results of the flip,
     and the getFace method to see if the result was HEADS. Keeping track
     of the current run length (the number of times in a row that the coin
     was HEADS) and the maximum run length is an exercise in loop
     techniques!
   * Print the result after the loop.