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That would print out this: a1010

Wrap b + c in parenthesis to force it to add them together then add it to the String.

Create an empty String variable in the sumAll() method then concatenate a and the sum of b and c

No it wouldn't since the second method doesn't do anything at all. There wouldn't be any result from it.

In the second method, 'a' is a char, not a String. I am assuming that the compiler is getting it's ASCII value and then using the first sumAll() method.