75 lines
1.9 KiB
TeX
75 lines
1.9 KiB
TeX
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% 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 - i.e.~in Object, but
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the default implementation checks reference equality only)
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\item
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6: False (a child class of 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 Tiger type is immutable)
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\item
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7: False (the class is not public)
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\item
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8: False (classes in the same package can read the name field)
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\item
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9: True (the constructor to implement must explicitly call Tiger's
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constructor with super)
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\item
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10: False (the declared type is Number, the runtime type is 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)
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\item
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2: True (if the hashCode() return value changes after the mutation then the
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implementation of hashMap is unable to recognize it was inserted 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 (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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