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Listing 7 - Question 13.
/*File Q13.java ************************************************/import java.util.*; public class Q13{ArrayList<Integer>var1 = new ArrayList<Integer>();void runIt(){var1.add(new Integer(1)); var1.add(new Integer(2));var1.add(new Integer(3));//Get an iterator Iterator iter = var1.iterator();//Perform the iterationwhile(iter.hasNext()){ System.out.println(iter.next().intValue());}//end while loop}//end runItpublic static void main(String[] args){new Q13().runIt(); }//end main}//end class Q13//=============================================//
Figure 5 - Question 13.
1 23

Answer 13



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Answer 13

False. This program produces the error shown in Figure 6 below. You must qualify the iterator as shown in Listing 8 to correct the error. If you don't qualify the iterator, the reference is retrieved fromthe list as type Object. The Object class neither defines nor inherits a method named intValue.

Listing 8 - Answer 13.
/*File A13.java ************************************************/import java.util.*; public class A13{ArrayList<Integer>var1 = new ArrayList<Integer>();void runIt(){var1.add(new Integer(1)); var1.add(new Integer(2));var1.add(new Integer(3));//Get an iterator Iterator<Integer>iter = var1.iterator();//Perform the iteration while(iter.hasNext()){System.out.println(iter.next().intValue()); }//end while loop}//end runItpublic static void main(String[]args){ new Q13().runIt();}//end main }//end class A13//=============================================//
Figure 6 - Answer 13.
Q13.java:22: error: cannot find symbol System.out.println(iter.next().intValue());^ symbol: method intValue()location: class Object 1 error

Back to Question 13

Answer 12

False. This program produces the compiler error shown in Figure 7 below. This is the result of attempting to store an object's reference of type String in acollection reserved exclusively for references to objects of type Date.

Figure 7 - Answer 12.
Q12.java:13: error: no suitable method found for add(String) var1.add("abcd");^ method ArrayList.add(int,Date) is not applicable(actual and formal argument lists differ in length) method ArrayList.add(Date) is not applicable(actual argument String cannot be converted to Date by method invocation conversion)1 error

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 to synthesize TiO2 nanoparticles by chemical methods
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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