Solution to e093: Average of numbers
See code at solutions/code/tutorialquestions/questione093
In the solution I define a class IntegerReader that can be used to read integers, and also specifically
positive integers, from standard input. Method readInteger uses a BufferedReader to repeatedly read lines from standard input until a line consisting of simply an integer is entered. The method uses Integer.parseInt to try to convert a line of input to an integer.
If the line is not an integer, an NumberFormatException will be thrown. This is immediately caught, and a message is displayed asking the
user to enter something that is actually an integer.
The class also declares readPositiveInteger, which repeatedly calls readInteger until a positive integer is entered. Notice the use
of a for loop of the form:
for(;;) {
...
}
in readPositiveInteger.