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hw1: done

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Claudio Maggioni 2022-09-25 18:35:18 +02:00
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@ -23,38 +23,42 @@
\item
4: False (== for objects checks for reference equality)
\item
5: False (it is indeed implemented by default - i.e.~in Object, but
the default implementation checks reference equality only)
5: False (it is indeed implemented by default - more precisely implemented
in Object - but the default implementation checks reference equality only)
\item
6: False (a child class of Tiger may include additional fields that
6: False (a child class of \texttt{Tiger} may include additional fields that
are mutable. However, all properties and behaviour accessible via a
reference of Tiger type is immutable)
reference of type \texttt{Tiger} type can be considered immutable)
\item
7: False (the class is not public)
7: False (the class itself is not public)
\item
8: False (classes in the same package can read the name field)
8: False (classes in the same package of \texttt{Tiger} can read the
\texttt{name} field)
\item
9: True (the constructor to implement must explicitly call Tiger's
constructor with super)
9: True (the constructor to implement must explicitly call \texttt{Tiger}'s
constructor with \texttt{super})
\item
10: False (the declared type is Number, the runtime type is Integer)
10: False (the declared type is \texttt{Number}, the runtime type is
\texttt{Integer})
\end{itemize}
\section{Exercise B}
\begin{itemize}
\item
1: False (the only `collection' data structure based over an unboxed
primitive type is the array)
1: False (the only ``collection'' data structure based over an unboxed
primitive type is the array -- however arrays are not \texttt{java.util}
collections)
\item
2: True (if the hashCode() return value changes after the mutation then the
implementation of hashMap is unable to recognize it was inserted previously)
2: True (if the \texttt{hashCode()} return value changes after the mutation
then the implementation of hashMap is unable to recognize it was inserted
previously)
\item
3: True
\item
4: True
\item
5: False (finally blocks are always evaluated)
5: False (\texttt{finally} blocks are always evaluated)
\end{itemize}
\section{Exercise C}