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Questions and Answers
What is a subtype of Object[]?
What is a subtype of Object[]?
- MyClass
- ArrayList
- String[] (correct)
- Chicken[]
What does the notation 'public MyClass' indicate?
What does the notation 'public MyClass' indicate?
- Usage of a wildcard
- Usage of a generic type inside the class (correct)
- An interface implementation
- Extension of the Object class
What can be used to avoid an ArrayStoreException?
What can be used to avoid an ArrayStoreException?
- Using an ArrayList instead of an array (correct)
- Using a wildcard
- Extending the Object class
- Implementing an interface
Which type of list is a subtype of ArrayList?
Which type of list is a subtype of ArrayList?
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What does the wildcard notation 'ArrayList<? extends Chicken>' represent?
What does the wildcard notation 'ArrayList<? extends Chicken>' represent?
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Study Notes
Subtypes of Arrays
- Object[] is a supertype, and its subtypes can be arrays of specific classes or interfaces.
Class Access Modifiers
- The notation 'public MyClass' indicates that the class MyClass has public access, meaning it can be accessed from anywhere.
Avoiding ArrayStoreException
- Using generics or parameterized types can be used to avoid an ArrayStoreException, which is thrown when trying to store the wrong type of object into an array of objects.
Subtypes of ArrayList
- LinkedList is a subtype of ArrayList, which means it inherits the properties and methods of ArrayList.
Wildcard Notation in Generics
- The wildcard notation 'ArrayList<? extends Chicken>' represents a list that can hold any type of object that is a subclass of Chicken, but not a superclass of Chicken.
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