Discussion
Which line is an inappropriate use of an assertion?
public class Sample27
{
public boolean equals(Object o)
{
assert o != null;
return o instanceof Sample27;
}
}
Answer: C
The equals contract requires that x.equals(null) return false rather than fail, so a null argument is expected input and not a broken invariant. With -ea this assertion turns a contract-conforming call into an AssertionError. The instanceof test already handles null correctly by returning false.
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