Discussion
The program is run with java -ea Demo99 - what will be the output?
public class Demo99
{
public static void main(String[] args)
{
assert "abc".indexOf("d") == -1;
System.out.println("abc".indexOf("c"));
}
}
Answer: C
indexOf reports -1 when the text is absent rather than throwing, so the assertion passes. The second call finds c at the zero-based position 2, which is printed. Treating the -1 sentinel as an index is the classic bug an assertion like this guards against.
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