Discussion
Which line contains the error?
public class Sample63
{
static class Item implements Comparable<Item>
{
int size;
public int compareTo(Item other)
{
assert compareTo(other) == -other.compareTo(this);
return Integer.compare(size, other.size);
}
}
}
Answer: C
The assertion calls the very method it sits in, so it recurses until the stack overflows before any comparison happens. Checking the symmetry of compareTo is a sensible idea, but it belongs in a test that calls the method from outside, not inside the method itself.
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