chapter 10 java
Which of the following statements declares Salaried as a subclass PayType?
public class Salaried extends PayType
If a superclass does not have a default constructor or a no-arg constuctor;
then a class that inherits from it, must call one of the constructors that the superclass does have
what will the the call to super do?
It will call the constructor of ClassA that receives an integer as an argument.
If a subclass constructor does not explicitly call a superclass constructor:
Java will automatically call the superclass's default or no-arg constructor just before the code in subclass's constructor executes
protected members are:
both A and B
When one object is a specialized version of another object, there is this type of relationship between them
is a
look at the following code. Which line has an error?
line 5 }
A protected member of a class may be directly accessed by
methods of the same class methods of a subclass methods in the same package
protected class members are denoted in a UML diagram with the symbol
#
When a subclass overloads a superclass method:
Both methods may be called with a subclass object
In the following statement, which is the superclass? public class ClassA extends ClassB implements ClassC
ClassB
Given the following code which of the following is true public class ClassB implements ClassA{ }
ClassB must override each method in ClassA
replacing inadequate superclass methods with more suitable subclass methods is known as what?
Method overloading
In an inheritance relationship:
The superclass constructor always executes before the subclass constructor
In the UML diagrams, inheritance is shown:
With a line that has a open arrowhead at one end that points to the superclass
If ClassC extents ClassB, which extends ClassA, this would be an example of
a chain of inheritance
If a class contains an abstract method:
all above
When an "is a" relationship exists between objects, it means that the specialized object has
all the characteristics of the general object, plus additional characteristics
All fields declared in an interface
are Final and Static
a subclass can directly access:
only public and protected members of the superclass
If two methods have the same name but different signatures, they are:
overloaded
If you do not provide an access specifier for a class member, the class member is given _____ by default:
package
A subclass may call an overridden superclass method by:
prefixing its name with the super keyword and a ( . )
When declaring class data members, it is best to declare them as:
private members
What keyword can you use to call a superclass constructor explicitly ?
super
The super statement that calls the superclass constructor:
must be the first statement in the subclass's constructor
If ClassA extends ClassB, then
public members in ClassB are public in ClassA, but private members in ClassB cannot be directly accessed in ClassA
When a method is declared with the _________ modifier, it cannot be overridden in a subclass
final
