Java Quiz

Name:

Equality
In Java, what is the difference between the comparision operator, ==, and the comparision method, equals, when comparing objects?
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Object References
Consider the following two innocent looking methods:

StringBuffer getText ()
{
    return myText;
}


String getName ()
{
    return myName;
}

Because every object variable in Java is a reference, explain why the first method has the potential to break the encapsulation of the object, while the second method does not.

Swapping two values
In C++, the following method swaps any two values passed:

template<class T>
void swap (T& a, T& b)
{
    T tmp = a;
    a = b;
    b = tmp;
}

In Java, however, the following version of the method has no effect on the two values passed:

void swap (Object a, Object b)
{
    Object tmp = a;
    a = b;
    b = tmp;
}

Even though all object variables in Java are actually references, explain why the Java version of swap does not work.
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Describe a way to write a generic swap method in Java. You do not need write your solution in Java code, just explain what is needed to make a swap method possible.
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What is the main difference between running programs in C++ and Java? What impact does that have in terms of compile-time versus run-time errors?

Why is extreme programming called extreme?
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Describe two extreme programming practices from the reading given out last week, one with which you agree strongly and one with which you disagree or might find difficult to apply. For each, explain your feelings.