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Part of a self-assessment test designed to help you determine how much you know about comparing objects, packages, import directives, and some common exceptions in Java.

Table of contents

Preface

This module is part of a self-assessment test designed to help you determine how much you know about object-orientedprogramming using Java.

The test consists of a series of questions with answers and explanations of the answers.

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.

I recommend that you open another copy of this document in a separate browser window and use the links to under Listings to easily find and view the listings while you are reading about them.

Questions

Question 1 .

What output is produced by the program shown in Listing 1 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. Joe Joe false
  • D. Joe Joe true
  • E. None of the above.
Listing 1 . Listing for Question 1.
public class Ap141{ public static void main(String args[]){new Worker().doIt(); }//end main()}//end class Ap141 class Worker{void doIt(){ char[]anArray = {'J','o','e'}; String Str1 = new String(anArray);String Str2 = new String(anArray); System.out.println(Str1 + " " + Str2 + " " + (Str1 == Str2));}//end doIt() }// end class Worker

Answer and Explanation

Question 2

What output is produced by the program shown in Listing 2 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. Joe Joe false
  • D. Joe Joe true
  • E. None of the above.
Listing 2 . Listing for Question 2.
public class Ap142{ public static void main(String args[]){new Worker().doIt(); }//end main()}//end class Ap142 class Worker{void doIt(){ char[]anArray = {'J','o','e'}; String Str1 = new String(anArray);String Str2 = new String(anArray); System.out.println(Str1 + " " + Str2 + " " + Str1.equals(Str2));}//end doIt() }// end class Worker

Answer and Explanation

Question 3

What output is produced by the program shown in Listing 3 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. ABC DEF GHI
  • D. None of the above.
Listing 3 . Listing for Question 3.
public class Ap143{ public static void main(String args[]){new Worker().doIt(); }//end main()}//end class Ap143 class Worker{void doIt(){ java.util.ArrayList ref =new java.util.ArrayList(1); ref.add("ABC ");ref.add("DEF "); ref.add("GHI");System.out.println((String)ref.get(0) + (String)ref.get(1) +(String)ref.get(2)); }//end doIt()}// end class Worker

Answer and Explanation

Question 4

What output is produced by the program shown in Listing 4 ?

  • A. Compiler Error
  • B. Runtime Error
  • C. ABC DEF GHI
  • D. None of the above.
Listing 4 . Listing for Question 4.
public class Ap144{ public static void main(String args[]){new Worker().doIt(); }//end main()}//end class Ap144 class Worker{void doIt(){ ArrayList ref =new ArrayList(1); ref.add("ABC ");ref.add("DEF "); ref.add("GHI");System.out.println((String)ref.get(0) + (String)ref.get(1) +(String)ref.get(2)); }//end doIt()}// end class Worker

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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