Discussion
Which line is an inappropriate use of an assertion?
public class Sample28
{
public static void main(String[] args)
{
java.io.File f = new java.io.File("data.txt");
assert f.exists() : "data.txt missing";
System.out.println(f.length());
}
}
Answer: D
Whether a file is present is a condition of the environment, not an invariant the code controls, and it can change between the check and the use. Disabled, the assertion is skipped and length() silently returns 0 for a missing file. Absent input is handled with a real test and an exception.
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