Final Exam — Questions

Event<T> class in library version 1.0.0

public class Event<T> implements IPublishEvent<T> {
    private final Queue<IEventHandler<T>> globalQueue =
        new ConcurrentLinkedQueue<IEventHandler<T>>();

    public void publish(T value) {
        for (IEventHandler<T> eachListener : globalQueue) {
            eachListener.handle(value);
        }
    }
}

Event<T> class after the library change

public class Event<T> implements IPublishEvent<T> {
    private final Queue<IEventHandler<T>> globalQueue =
        new ConcurrentLinkedQueue<IEventHandler<T>>();

    public void publish(T value) {
        for (IEventHandler<T> eachListener : globalQueue) {
            if (eachListener == null) {
                continue;
            }

            eachListener.handle(value);
        }
    }
}

Given architecture

• Interface IPageable exposes UNKNOWN_N_OF_PAGES, getNumberOfPages(), getCurrentPageContent(), tryFlipToNextPage(), and tryFlipToPreviousPage().
• BookService implements that interface and exposes curPage plus the same page-navigation and content methods.

Java example code

boolean meetsC8H10N4O2Temp(int temp) {
    return !(temp < 48 || temp > 60);
}

Java example code and equivalence classes

• temp < 48
• 48 <= temp <= 60
• temp > 60

boolean meetsC8H10N4O2Temp(int temp) {
    return !(temp < 48 || temp > 60);
}

Java source code

char foobar(boolean first, boolean second, boolean third, boolean fourth) {
    char result = 'S';
    if (first) {
        result = 'E';
    } else if (second) {
        result = '1';
    } else if (third) {
        if (fourth) {
            result = '!';
        }
    }
    return result;
}

Java source code

char foobar(boolean first, boolean second, boolean third, boolean fourth) {
    char result = 'S';
    if (first) {
        result = 'E';
    } else if (second) {
        result = '1';
    } else if (third) {
        if (fourth) {
            result = '!';
        }
    }
    return result;
}

Java source code

char foobar(boolean first, boolean second, boolean third, boolean fourth) {
    char result = 'S';
    if (first) {
        result = 'E';
    } else if (second) {
        result = '1';
    } else if (third) {
        if (fourth) {
            result = '!';
        }
    }
    return result;
}

Event<T> Klasse der Bibliothek Version 1.0.0

public class Event<T> implements IPublishEvent<T> {
    private final Queue<IEventHandler<T>> globalQueue =
        new ConcurrentLinkedQueue<IEventHandler<T>>();

    public void publish(T value) {
        for (IEventHandler<T> eachListener : globalQueue) {
            eachListener.handle(value);
        }
    }
}

Event<T> Klasse nach der Überarbeitung der Bibliothek Version 1.0.0

public class Event<T> implements IPublishEvent<T> {
    private final Queue<IEventHandler<T>> globalQueue =
        new ConcurrentLinkedQueue<IEventHandler<T>>();

    public void publish(T value) {
        for (IEventHandler<T> eachListener : globalQueue) {
            if (eachListener == null) {
                continue;
            }

            eachListener.handle(value);
        }
    }
}

Gegebene Architektur

• Interface IPageable enthält UNKNOWN_N_OF_PAGES, getNumberOfPages(), getCurrentPageContent(), tryFlipToNextPage() und tryFlipToPreviousPage().
• BookService implementiert dieses Interface und enthält curPage sowie dieselben Navigations- und Inhaltsmethoden.

Java-Beispielcode

boolean meetsC8H10N4O2Temp(int temp) {
    return !(temp < 48 || temp > 60);
}

Java-Beispielcode und Äquivalenzklassen

• temp < 48
• 48 <= temp <= 60
• temp > 60

boolean meetsC8H10N4O2Temp(int temp) {
    return !(temp < 48 || temp > 60);
}

Java Source Code

char foobar(boolean first, boolean second, boolean third, boolean fourth) {
    char result = 'S';
    if (first) {
        result = 'E';
    } else if (second) {
        result = '1';
    } else if (third) {
        if (fourth) {
            result = '!';
        }
    }
    return result;
}

Java Source Code

char foobar(boolean first, boolean second, boolean third, boolean fourth) {
    char result = 'S';
    if (first) {
        result = 'E';
    } else if (second) {
        result = '1';
    } else if (third) {
        if (fourth) {
            result = '!';
        }
    }
    return result;
}

Java Source Code

char foobar(boolean first, boolean second, boolean third, boolean fourth) {
    char result = 'S';
    if (first) {
        result = 'E';
    } else if (second) {
        result = '1';
    } else if (third) {
        if (fourth) {
            result = '!';
        }
    }
    return result;
}