Users of mobile devices typically interact with apps via a(n) __________ instead of a mouse or a keyboard.

A programmer tries to create a subclass of String called MyString. When the programmer compiles her new class, the compiler produces the following message:

``` MyString.java:1: cannot inherit from final java.lang.String public class MyString extends String { ^ 1 error ``` Explain the cause of this error.

Where is a global variable defined?

A. Outside a function B. Inside a function C. Anywhere D. In a function header line