I just find that interface Path has extended 3 class, which against the principle;
public interface Path
extends Comparable<Path>, Iterable<Path>, Watchable
????
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Japhy Fan
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no. an interface can extend several other interfaces (not classes) – Stultuske Aug 22 '18 at 09:40
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1@deHaar code as picture instead of text is no improvement! – user85421 Aug 22 '18 at 09:54
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The extends keyword is used with interfaces to make them extend other interfaces (that is not extending multiple classes).
All the types after the extends keyword of Path are interfaces (Comparable, Iterable, and Watchable).
ernest_k
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