79 lines
2.1 KiB
TeX
79 lines
2.1 KiB
TeX
% vim: set ts=2 sw=2 et tw=80:
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\documentclass[12pt,a4paper]{article}
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\usepackage[utf8]{inputenc}
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\usepackage[margin=2cm]{geometry}
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\title{Howework 1 -- Advanced Java Programming}
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\author{Claudio Maggioni}
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\begin{document}
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\maketitle
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\section{Exercise A}
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\begin{itemize}
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\item
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1: True
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\item
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2: False (Required only if the class implements Comparable)
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\item
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3: True
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\item
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4: False (== for objects checks for reference equality)
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\item
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5: False (it is indeed implemented by default - more precisely implemented
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in Object - but the default implementation checks reference equality only)
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\item
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6: False (a child class of \texttt{Tiger} may include additional fields that
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are mutable. However, all properties and behaviour accessible via a
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reference of type \texttt{Tiger} type can be considered immutable)
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\item
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7: False (the class itself is not public)
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\item
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8: False (classes in the same package of \texttt{Tiger} can read the
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\texttt{name} field)
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\item
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9: True (the constructor to implement must explicitly call \texttt{Tiger}'s
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constructor with \texttt{super})
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\item
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10: False (the declared type is \texttt{Number}, the runtime type is
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\texttt{Integer})
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\end{itemize}
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\section{Exercise B}
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\begin{itemize}
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\item
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1: False (the only ``collection'' data structure based over an unboxed
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primitive type is the array -- however arrays are not \texttt{java.util}
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collections)
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\item
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2: True (if the \texttt{hashCode()} return value changes after the mutation
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then the implementation of hashMap is unable to recognize it was inserted
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previously)
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\item
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3: True
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\item
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4: True
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\item
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5: False (\texttt{finally} blocks are always evaluated)
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\end{itemize}
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\section{Exercise C}
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\begin{itemize}
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\item 1: True
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\item 2: False
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\item 3: True
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\item 4: True (more precisely, double dispatch or 'virtual table' invocations
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are used only for invoking the method in the class matching the object's
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dynamic type)
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\item 5: True (as the method called depends on the runtime or dynamic type of
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the caller object)
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\end{itemize}
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\end{document}
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