Hands-On Design Patterns with Java

InterpreterDriver class

The InterpreterDriver class is the class that drives the application and therefore contains the main() method. There are two class variables, originatingContent and theExpression; both are initially set to null.

In addition to the constructor method, there is also an interpret() method that does the following:

1. Uses the Scanner class
2. Instantiates a new Expression instance
3. Calls the interpret() method on the new Expression instance

The InterpreterDriver class is provided next:

import java.util.Scanner;public class InterpreterDriver {    // class variables    public Conversion originatingContent = null;    public Expression theExpression = null;    public InterpreterDriver(Conversion content) {        originatingContent = content;