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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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Table of contents

Preface

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.

Questions

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 mutation
Janga Reply
what is a cell
Sifune Reply
how is urine form
Sifune
what is antagonism?
mahase Reply
classification of plants, gymnosperm features.
Linsy Reply
what is the features of gymnosperm
Linsy
how many types of solid did we have
Samuel Reply
what is an ionic bond
Samuel
What is Atoms
Daprince Reply
what is fallopian tube
Merolyn
what is bladder
Merolyn
what's bulbourethral gland
Eduek Reply
urine is formed in the nephron of the renal medulla in the kidney. It starts from filtration, then selective reabsorption and finally secretion
onuoha Reply
State the evolution relation and relevance between endoplasmic reticulum and cytoskeleton as it relates to cell.
Jeremiah
what is heart
Konadu Reply
how is urine formed in human
Konadu
how is urine formed in human
Rahma
what is the diference between a cavity and a canal
Pelagie Reply
what is the causative agent of malaria
Diamond
malaria is caused by an insect called mosquito.
Naomi
Malaria is cause by female anopheles mosquito
Isaac
Malaria is caused by plasmodium Female anopheles mosquitoe is d carrier
Olalekan
a canal is more needed in a root but a cavity is a bad effect
Commander
what are pathogens
Don Reply
In biology, a pathogen (Greek: πάθος pathos "suffering", "passion" and -γενής -genēs "producer of") in the oldest and broadest sense, is anything that can produce disease. A pathogen may also be referred to as an infectious agent, or simply a germ. The term pathogen came into use in the 1880s.[1][2
Zainab
A virus
Commander
Definition of respiration
Muhsin Reply
respiration is the process in which we breath in oxygen and breath out carbon dioxide
Achor
how are lungs work
Commander
where does digestion begins
Achiri Reply
in the mouth
EZEKIEL
what are the functions of follicle stimulating harmones?
Rashima Reply
stimulates the follicle to release the mature ovum into the oviduct
Davonte
what are the functions of Endocrine and pituitary gland
Chinaza
endocrine secrete hormone and regulate body process
Achor
while pituitary gland is an example of endocrine system and it's found in the Brain
Achor
what's biology?
Egbodo Reply
Biology is the study of living organisms, divided into many specialized field that cover their morphology, physiology,anatomy, behaviour,origin and distribution.
Lisah
biology is the study of life.
Alfreda
Biology is the study of how living organisms live and survive in a specific environment
Sifune
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Source:  OpenStax, Object-oriented programming (oop) with java. OpenStax CNX. Jun 29, 2016 Download for free at https://legacy.cnx.org/content/col11441/1.201
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