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I am working on a calculator like assignment for my data structures class, and I have to input symbols into the array list defined as 

ArrayList<ScalarSymbol> scalar;

and I have been trying to input values into it by doing this:

scalars.add(0,')');

and it tells me that the char type is not the correct syntax for the <ScalarSymbol> array. I don't know how to find out what types the array will take, is there bind I have to use in order to make it accept chars?

Klitos Kyriacou
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JAY PATEL
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  • I'm curious, what lead you to believe that `add(0, ')')` would do what you want? The [`ArrayList.add()` documentation](https://docs.oracle.com/javase/8/docs/api/java/util/ArrayList.html#add-E-) should be your canonical reference (and you can see it only takes one parameter), along with the [collections tutorial](https://docs.oracle.com/javase/tutorial/collections/) which covers interacting with `ArrayList` and other generic collections. – dimo414 Feb 23 '17 at 20:09

1 Answers1

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Just create an instance of the object you want to add:

ScalarSymbol s = new ScalarSymbol();

Then add it to the list:

scalar.add(s);

The array list only takes the type written in these:

<type>
mrhallak
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