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This module contains review questions and answers keyed to the module titled Jb0280: Java OOP: String and StringBuffer.

Revised: Tue Mar 29 11:29:05 CDT 2016

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This module contains review questions and answers keyed to the module titled Jb0280: Java OOP: String and StringBuffer .

The questions and the answers are connected by hyperlinks to make it easy for you to navigate from the question to the answer and back again.


Question 1 .

Java provides two different string classes from which string objects can be instantiated. What are they?

Answer 1

Question 2

True or false? The StringBuffer class is used for strings that are not allowed to change. The String class is used for strings that are modified by the program. If false, explain why.

Answer 2

Question 3

True or false? While the contents of a String object cannot be modified, a reference to a String object can be caused to point to a different String object. If false, explain why.

Answer 3

Question 4

True or false? The use of the new operator is required for instantiation of objects of type String . If false, explain your answer.

Answer 4

Question 5

True or false? The use of the new operator is required for instantiation of objects of type StringBuffer . If false, explain your answer

Answer 5

Question 6

Provide a code fragment that illustrates how to instantiate an empty StringBuffer object of a default length and then use a version of the append method to put some data into the object.

Answer 6

Question 7

Without specifying any explicit numeric values, provide a code fragment that will instantiate an empty StringBuffer object of the correct initial length to contain the string "StringBuffer named str6" and then store that string in the object.

Answer 7

Question 8

Provide a code fragment consisting of a single statement showing how to use the Integer wrapper class to convert a string containing digits to an integer and store it in a variable of type int .

Answer 8

Question 9

Explain the difference between the capacity method and the length method of the StringBuffer class.

Answer 9

Question 10

True or false? The following is a valid code fragment. If false, explain why.

StringBuffer str6 = new StringBuffer("StringBuffer named str6".length());

Answer 10

Question 11

Which of the following code fragments is the most efficient, first or second?

String str1 = "THIS STRING IS NAMED str1"; String str1 = new String("THIS STRING IS NAMED str1");

Answer 11

Question 12

Write a Java application that illustrates the fact that while a String object cannot be modified, the reference variable can bemodified to point to a new String object, which can have the appearance of modifying the original String object.

Answer 12

Question 13

Write a Java application that illustrates different ways to create String objects and StringBuffer objects.

Answer 13

Question 14

Write a Java application that illustrates conversion from string to numeric.

Questions & Answers

what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
yes that's correct
I think
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
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 did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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