PostfixMain

// File name: Main.java

public class Main {
    private static String postfixRepr(Expression e) {
        // TODO: implement this
        return "Postfix not implemented!";
    }

    private static String infixRepr(Expression e) {
        // TODO: implement this
        return "Infix not implemented";
    }

    public static void main(String[] args) {
        System.out.println(postfixRepr(Expression.EXAMPLE_1));
        System.out.println(infixRepr(Expression.EXAMPLE_2));
    }
}