Expression.java

Expression

Expression can be written as the following Algebraic Data Type (ADT)

Expression = Addition(leftHandSide: Expression, rightHandSide: Expression)
           | Subtraction(leftHandSide: Expression, rightHandSide: Expression)
           | Identifier(name: String)
           | Int(value: int)
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package expression;
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Expression is the common abstract class for Expressions that can be evaluated using the Evaluator. 

abstract public class Expression { }