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CSIT121 Exam Revision Questions & 100% Solutions (Verified Answers
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CSIT121 Exam Revision Questions & 100% Solutions (Verified Answer
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CSIT121 Exam Revision Questions &100% Solutions (Verified Answers)
Commonality is expressed in the members of the superclass - ✔✔True
A subc can inherit methods that does not need/should not have - ✔✔True
Even when a superclass method is appropriate for a subclass, that subclass often needs a customized
version of the method. - ✔✔True
The subclass can override (redefine) superclass method with an appropriate implementation -
✔✔True
A class' s public members are accessible wherever the program has a ref to an object of that class or
one of its subclasses. - ✔✔True
A class' s private members are accessible only within the class itself - ✔✔True
protected access is an intermediate level of access between public and private - ✔✔True
A superclass's protected members can't be accessed by members of that superclass - ✔✔False
A superclass's protected members can be accessed by members of other classes of the same package -
✔✔True
,protected members also have package access - ✔✔True
All public and protected superclass members retain their original access modifier when they
become members of the subclass. - ✔✔True
A superclass' s private members are hidden from its subclasses - ✔✔True
A superclass' s private members can be accessed only through the public or protected
methods inherited from the superclass. - ✔✔True
Subclass methods can refer to public and protected members inherited from the superclass simply
by using the member names - ✔✔True
When a subclass method overrides an inherited superclass method, the superclass version of the
method can be accessed from the subclass by preceding the superclass method name with
keyword super and a dot(.) separator. - ✔✔True
Constructors are not inherited - ✔✔True
The first task of a subclass constructor is not to call its direct superclass's constructor explicitly or
implicitly - ✔✔False. Its the 1st task to ensure the instance variables inherited from the superclass
are initialized properly.
If the code doesn't include an explicit call to the superclass constructor, Java explicit call to the
superclass constructor, Java implicitly calls the superclass's default or no-argument constructor
- ✔✔True
A class's default constructor calls the superclass's default or no-argument constructor. - ✔✔True
toString is called implicitly whenever an object must be converted to a String representation -
✔✔True
, To override a superclass method, a subclass must declare a method with the same signature as
the superclass method. - ✔✔TRUE
subclass inherits superclass's variables and methods. - ✔✔true
Only superclass's public and protected members are directly accessible in the subclass - ✔✔TRUE
Each subclass constructor must implicitly or explicitly call one if its superclass's constructors to initialize
the instance variables inherited from the superclass. - ✔✔TRUE
Superclass constructor call syntax-SUPER, followed by a set of parentheses containing the superclass
constructor arguments. - ✔✔TRUE
Its okay for the subclass not to invoke the superclass's constructor explicitly - ✔✔If the subclass didn't
invoke the superclass's constructor explicitly, the compiler would attempt to insert a call to the
superclass's default or no-argument constructor
Instantiating a subclass object begins a chain of constructor calls. - ✔✔TRUE
The subclass constructor, before performing its tasks, explicitly uses super to call one of the
constructors in its direct superclass or implicitly calls the superclass's default or no-argument
constructor - ✔✔TRUE
If the superclass is derived from another class, their superclass constructor invokes the constructor
of the next class up the hierarchy, and so on. - ✔✔TRUE
The last constructor called in the chain is not always Object's constructor, but the Object's constructor is
the first to be implemented. - ✔✔The last constructor called in the chain is always Object's
constructor, but the Object's constructor is the first to be implemented. Original subclass constructor's
body finishes executing last (LIFS)
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