public void evaluatePostfixMethod(PostfixExpression expression) {
int op = expression.getOperation().getType();
switch (op) {
case Types.PLUS_PLUS:
evaluatePostfixMethod(op, "next", expression.getExpression(), expression);
break;
case Types.MINUS_MINUS:
evaluatePostfixMethod(op, "previous", expression.getExpression(), expression);
break;
}
}
