Write a program that reads in a set of coin descriptions from a file. The input file has the format coinName1 coinValue1 coinName2 coinValue2 ... Add a method void read(Scanner in) throws FileNotFoundException to the Coin class of Section 7.2. Throw an exception if the current line is not properly formatted. Then implement a method static ArrayList readFile(String filename) throws FileNotFoundException In the main method, call readFile. If an exception is thrown, give the user a chance to select another file. If you read all coins successfully, print the total value.

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Variables and Constant

Constants and variables are widely used in mathematical equations and expressions. They are also commonly found in the domain of programming, where each language has its own way to differentiate between a constant and a variable. Since they have all sorts of applications, knowing their differences is a good place to start.