Question

So I found source code that presumably parses a mathematical expression and calculates the answer. However, the code contains a syntax error when declaring a new map. This new map is supposed to hold a String and a number. I do know that maps can’t reference primitive types, like double, though. How can I resolve this issue?

private Map<String, double=""> user_var = new HashMap<String, double="">();

To see the rest of the code, one can visit here

Thank you

Answer 1

That’s an incorrect declaration. Correct would be:

private Map<String, Double> user_var = new HashMap<String, Double>();