Discussion
Which line is an inappropriate use of an assertion?
public class Sample09
{
public void setRate(int rate)
{
assert rate > 0 : "rate must be positive";
this.rate = rate;
}
private int rate;
}
Answer: A
setRate is public, so the restriction on rate is part of its published contract and must hold whether or not assertions are enabled. Run without -ea this check disappears and an invalid rate is stored silently. A public method enforces its preconditions with an explicit test that throws IllegalArgumentException; assertions belong in non-public methods.
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