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CAPITOLO 6

CAPITOLO 6. LA GESTIONE DELLE ECCEZIONI IN JAVA. ECCEZIONI E catch/throw. Consentono di realizzare goto non locali void GrowZebra(Zebra mz) { try { for (;;) {FeedZebra(mz, new Anchovy()) ;}} catch (JunkFoodException e) { mz.Starve(); }

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CAPITOLO 6

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  1. CAPITOLO 6 LA GESTIONE DELLE ECCEZIONI IN JAVA

  2. ECCEZIONI E catch/throw • Consentono di realizzare goto non locali void GrowZebra(Zebra mz) { try { for (;;) {FeedZebra(mz, new Anchovy()) ;}} catch (JunkFoodException e) { mz.Starve(); } catch (ThrowUpException e) { mz.Drink(new Digestive()); } } void FeedZebra(Zebra z, Anchovy a) { Exception away = new JunkFoodException(); Exception up = new ThrowUpException(); if (a.smells()) { throw away; } else if (z.full()) { throw up; } else { z.GiveAnchovy(a); } }

  3. ECCEZIONI PREDEFINITE E DEFINIZIONE DI ECCEZIONI • Eccezioni predefinite e ricuperabili ArithmeticException IllegalArgumentException ArrayStoreException IllegalMonitorStateException ClassCastException IllegalThreadStateException NullPointerException IndexOutOfBoundException NumberFormatException NegativeArraySizeException SecurityException • Definizione di nuove eccezioni ricuperabili class JunkFoodException extends Exception { JunkFoodException() {} }

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