//File: BooleanExpression.java //Name: Trai Pham //Date: 02/16/2020 //Course: CSE 8B /** */ public abstract class BooleanExpression extends Expression{ //subclasses will use objects for evaluation public BooleanExpression a; public BooleanExpression b; //if I add this, there would be a class error with BooleanValue // public abstract BooleanValue boolEvaluate(); }