Here are a few practice problems on Exceptions and Files

1. Write a program that has a method that prints the first 6 entries of an array. Have the main method call this with an array
    that has only 5 elements. Use a try-catch statement to catch the resulting exception.

2. Write a program that reads from the keyboard and prints lines of text. In between the reading of a line and
     the printing of the line send this line to a method
             String filter(String line)
    If the argument line contains the substring "bob" (just look for the index of "bob" in line), have the filter method throw
    a Runtime exception -- we don't want any bobs. If line does not contain "bob", just have the filter method return the line.
    Finally, your call to filter should catch any Runtime exception that is thrown by this method.

3. Write a program that reads a list of integers from the keyboard. As each number is read it should be stored in a file
     called "data.txt". Use the FileWriter class to do this. Write another program that reads integer data out of file
     data.txt and prints the average value of this data.