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Answer 26

Question 27

True or False? The class that begins in Listing 5 does not have an access modifier. This puts it in package-private access category. A class with package-private access can be accessed by codethat is stored in the same package and cannot be accessed by code stored in other packages.

Answer 27

Question 28

True or False? The last three statements in Listing 5 declare three private variables. Because these variables are declared private, they can be accessed by any method defined in any class in thesame package.

Answer 28

Question 29

True or False? The three variables declared in Listing 5 are instance variables as opposed to class variables .

Answer 29

Question 30

True or False? Because the three variables declared in Listing 5 are instance variables, they belong to an object instantiated from the class. Even if the variables were public, they could onlybe accessed by first gaining access to the object to which they belong.

Answer 30

Question 31

True or False? The three variables declared in Listing 5 are reference variables . This means that they are capable of storing references to objects and are also capable of storing values of the eightprimitive types.

Answer 31

Question 32

True or False? Ericson's class library contains a class named World and another class named Turtle . The code in Listing 5 instantiates one object of the World class and populates that world with three objects of the Turtle class.

Answer 32

Question 33

True or False? Every class definition has one or more method-like members called constructors. (If you don't define a constructor when you define a class, a default constructor will be automatically defined for your class.)

Answer 33

Question 34

True or False? The name of the constructor must always be the same as the name of the class in which it is defined. Like a method, a constructor may ormay not take arguments. If there are two or more (overloaded) constructors, they must have different argument lists.

Answer 34

Question 35

True or False? To instantiate an object of a class, you apply the new operator to the class' constructor, passing parameters that satisfy the requiredarguments for the constructor.

Answer 35

Question 36

True or False? When an object is instantiated, the constructor returns an array containing the values in all of the instance variables.

Answer 36

Question 37

True or False? The last two statements in Listing 5 instantiate two objects of the Turtle class and use them to populate the World object whose reference is stored in the variable named mars .

Answer 37

Question 38

True or False? If a variable (exclusive of local variables inside of methods) is not purposely initialized when the object in instantiated, it will receive a default initialization value. The default values are:

  • 0 or 0.0 for numeric variables
  • true for boolean variables
  • null for reference variables

Answer 38

Question 39

True or False? Code written into a class' constructor is executed when an object of the class is instantiated.

Answer 39

Question 40

True or False? Good object-oriented programming practice says that most of the instance variables encapsulated in an object should be declared private. Ifthere is a need to make the contents of those variables available outside the object, that should be accomplished by defining protected accessor methods.

Questions & Answers

what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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