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13 Cards in this Set
- Front
- Back
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Polymorphic method invocations apply only to overridden instance methods. |
True |
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The object's type determines whichmethods can be called |
False The reference variable's type (not the object's type) determines whichmethods can be called! |
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constructors can be overridden |
False constructors can be overloadedbut not overridden |
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With respect to the method it overrides, the overriding method... - Must have exactly the same return type or its supertype |
False Must have the same return type, except that, as of Java 5, the return typecan be a subclass, and this is known as a covariant return |
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With respect to the method it overrides, the overriding method... - could have a more restrictive access modifier |
False Must not have a more restrictive access modifier |
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With respect to the method it overrides, the overriding method... - May have a less restrictive access modifier |
True May have a less restrictive access modifier Parent: protected -> Child: public |
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With respect to the method it overrides, the overriding method... - May throw broader checked exceptions |
False Must not throw new or broader checked exception |
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With respect to the method it overrides, the overriding method... - May throw fewer or narrower checked exceptions, or any uncheckedexception |
True May throw fewer or narrower checked exceptions, or any uncheckedexception |
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Overloaded methods could have the same argument lists |
False Must have different argument lists |
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Object type (not the reference variable's type) determines which overriddenmethod is used at runtime |
True Object type (not the reference variable's type) determines which overriddenmethod is used at runtime |
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Reference type determines which overloaded method will be used atcompile time. |
True Reference type determines which overloaded method will be used atcompile time. |
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Upcasting takes effect when you have a reference variable that refers to a subtypeobject: you can assign it to a reference variable of the subtype. |
False It's about Downcasting: If you have a reference variable that refers to a subtypeobject, you can assign it to a reference variable of the subtype. You mustmake an explicit cast to do this, and the result is that you can access thesubtype's members with this new reference variable. |
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Upcasting: You can assign a reference variable to a supertype referencevariable explicitly or implicitly. |
True Upcasting: You can assign a reference variable to a supertype referencevariable explicitly or implicitly. |
