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6
Semester 1/Programming 1/Java/examples/projects/chapter14/tech-support-io/InputReader.ctxt Executable file
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#BlueJ class context
comment0.target=InputReader()
comment0.text=\nCreate\ a\ new\ InputReader\ that\ reads\ text\ from\ the\ text\ terminal.\n\n
comment1.target=HashSet<String>\ getInput()
comment1.text=\nRead\ a\ line\ of\ text\ from\ standard\ input\ (the\ text\ terminal),\nand\ return\ it\ as\ a\ set\ of\ words.\n\n@return\ \ A\ set\ of\ Strings,\ where\ each\ String\ is\ one\ of\ the\ \nwords\ typed\ by\ the\ user\n\n
numComments=2

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Semester 1/Programming 1/Java/examples/projects/chapter14/tech-support-io/InputReader.java Executable file
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import java.util.HashSet;
import java.util.Scanner;
/**
* InputReader reads typed text input from the standard text terminal.
* The text typed by a user is then chopped into words, and a set of words
* is provided.
*
* @author David J. Barnes and Michael Kölling.
* @version 2016.02.29
*/
public class InputReader
{
private Scanner reader;
/**
* Create a new InputReader that reads text from the text terminal.
*/
public InputReader()
{
reader = new Scanner(System.in);
}
/**
* Read a line of text from standard input (the text terminal),
* and return it as a set of words.
*
* @return A set of Strings, where each String is one of the
* words typed by the user
*/
public HashSet<String> getInput()
{
System.out.print("> "); // print prompt
String inputLine = reader.nextLine().trim().toLowerCase();
String[] wordArray = inputLine.split(" "); // split at spaces
// add words from array into hashset
HashSet<String> words = new HashSet<>();
for(String word : wordArray) {
words.add(word);
}
return words;
}
}

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Semester 1/Programming 1/Java/examples/projects/chapter14/tech-support-io/README.TXT Executable file
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TechSupport - the DodgySoft Technical support system.
This project is part of the material for the book
Objects First with Java - A Practical Introduction using BlueJ
Sixth edition
David J. Barnes and Michael Kölling
Pearson Education, 2016
This project is discussed in chapters 5 and 12.
This project implements a technical support system for customers of the
DodgySoft software company. Users can describe their software problems and
get advice instantly!
The idea is based on Eliza - a famous program described by Joseph Weizenbaum
in 1966. (Do a web search for "Eliza" and "Weizenbaum" if you want to know
more about this.)
In fact, it is much more primitive than Eliza. But that's enough to match the
quality of many software companies' technical support advice... ;-)
To start this program, create a SupportSystem object and execute the "start"
method.
Then start describing your problem by typing in the terminal window.
The purpose of this project is to demonstrate and study library classes, such
as ArrayList, HashMap, HashSet, and Random.

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Semester 1/Programming 1/Java/examples/projects/chapter14/tech-support-io/Responder.ctxt Executable file
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#BlueJ class context
comment0.params=
comment0.target=Responder()
comment0.text=\r\n\ Construct\ a\ Responder\r\n
comment1.params=words
comment1.target=java.lang.String\ generateResponse(java.util.HashSet)
comment1.text=\r\n\ Generate\ a\ response\ from\ a\ given\ set\ of\ input\ words.\r\n\ \r\n\ @param\ words\ \ A\ set\ of\ words\ entered\ by\ the\ user\r\n\ @return\ \ \ \ \ \ \ A\ string\ that\ should\ be\ displayed\ as\ the\ response\r\n
comment2.params=
comment2.target=void\ fillResponseMap()
comment2.text=\r\n\ Enter\ all\ the\ known\ keywords\ and\ their\ associated\ responses\r\n\ into\ our\ response\ map.\r\n
comment3.params=
comment3.target=void\ fillDefaultResponses()
comment3.text=\r\n\ Build\ up\ a\ list\ of\ default\ responses\ from\ which\ we\ can\ pick\r\n\ if\ we\ don't\ know\ what\ else\ to\ say.\r\n
comment4.params=
comment4.target=java.lang.String\ pickDefaultResponse()
comment4.text=\r\n\ Randomly\ select\ and\ return\ one\ of\ the\ default\ responses.\r\n\ @return\ \ \ \ \ A\ random\ default\ response\r\n
numComments=5

157
Semester 1/Programming 1/Java/examples/projects/chapter14/tech-support-io/Responder.java Executable file
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import java.io.*;
import java.nio.charset.Charset;
import java.nio.file.*;
import java.util.*;
/**
* The responder class represents a response generator object.
* It is used to generate an automatic response, based on specified input.
* Input is presented to the responder as a set of words, and based on those
* words the responder will generate a String that represents the response.
*
* Internally, the reponder uses a HashMap to associate words with response
* strings and a list of default responses. If any of the input words is found
* in the HashMap, the corresponding response is returned. If none of the input
* words is recognized, one of the default responses is randomly chosen.
*
* @author David J. Barnes and Michael Kölling.
* @version 2016.02.29
*/
public class Responder
{
// Used to map key words to responses.
private HashMap<String, String> responseMap;
// Default responses to use if we don't recognise a word.
private ArrayList<String> defaultResponses;
// The name of the file containing the default responses.
private static final String FILE_OF_DEFAULT_RESPONSES = "default.txt";
private Random randomGenerator;
/**
* Construct a Responder
*/
public Responder()
{
responseMap = new HashMap<>();
defaultResponses = new ArrayList<>();
fillResponseMap();
fillDefaultResponses();
randomGenerator = new Random();
}
/**
* Generate a response from a given set of input words.
*
* @param words A set of words entered by the user
* @return A string that should be displayed as the response
*/
public String generateResponse(HashSet<String> words)
{
Iterator<String> it = words.iterator();
while(it.hasNext()) {
String word = it.next();
String response = responseMap.get(word);
if(response != null) {
return response;
}
}
// If we get here, none of the words from the input line was recognized.
// In this case we pick one of our default responses (what we say when
// we cannot think of anything else to say...)
return pickDefaultResponse();
}
/**
* Enter all the known keywords and their associated responses
* into our response map.
*/
private void fillResponseMap()
{
responseMap.put("crash",
"Well, it never crashes on our system. It must have something\n" +
"to do with your system. Tell me more about your configuration.");
responseMap.put("crashes",
"Well, it never crashes on our system. It must have something\n" +
"to do with your system. Tell me more about your configuration.");
responseMap.put("slow",
"I think this has to do with your hardware. Upgrading your processor\n" +
"should solve all performance problems. Have you got a problem with\n" +
"our software?");
responseMap.put("performance",
"Performance was quite adequate in all our tests. Are you running\n" +
"any other processes in the background?");
responseMap.put("bug",
"Well, you know, all software has some bugs. But our software engineers\n" +
"are working very hard to fix them. Can you describe the problem a bit\n" +
"further?");
responseMap.put("buggy",
"Well, you know, all software has some bugs. But our software engineers\n" +
"are working very hard to fix them. Can you describe the problem a bit\n" +
"further?");
responseMap.put("windows",
"This is a known bug to do with the Windows operating system. Please\n" +
"report it to Microsoft. There is nothing we can do about this.");
responseMap.put("macintosh",
"This is a known bug to do with the Mac operating system. Please\n" +
"report it to Apple. There is nothing we can do about this.");
responseMap.put("expensive",
"The cost of our product is quite competitive. Have you looked around\n" +
"and really compared our features?");
responseMap.put("installation",
"The installation is really quite straight forward. We have tons of\n" +
"wizards that do all the work for you. Have you read the installation\n" +
"instructions?");
responseMap.put("memory",
"If you read the system requirements carefully, you will see that the\n" +
"specified memory requirements are 1.5 giga byte. You really should\n" +
"upgrade your memory. Anything else you want to know?");
responseMap.put("linux",
"We take Linux support very seriously. But there are some problems.\n" +
"Most have to do with incompatible glibc versions. Can you be a bit\n" +
"more precise?");
responseMap.put("bluej",
"Ahhh, BlueJ, yes. We tried to buy out those guys long ago, but\n" +
"they simply won't sell... Stubborn people they are. Nothing we can\n" +
"do about it, I'm afraid.");
}
/**
* Build up a list of default responses from which we can pick
* if we don't know what else to say.
*/
private void fillDefaultResponses()
{
Charset charset = Charset.forName("US-ASCII");
Path path = Paths.get(FILE_OF_DEFAULT_RESPONSES);
try (BufferedReader reader = Files.newBufferedReader(path, charset)) {
String response = reader.readLine();
while(response != null) {
defaultResponses.add(response);
response = reader.readLine();
}
}
catch(FileNotFoundException e) {
System.err.println("Unable to open " + FILE_OF_DEFAULT_RESPONSES);
}
catch(IOException e) {
System.err.println("A problem was encountered reading " +
FILE_OF_DEFAULT_RESPONSES);
}
// Make sure we have at least one response.
if(defaultResponses.size() == 0) {
defaultResponses.add("Could you elaborate on that?");
}
}
/**
* Randomly select and return one of the default responses.
* @return A random default response
*/
private String pickDefaultResponse()
{
// Pick a random number for the index in the default response list.
// The number will be between 0 (inclusive) and the size of the list (exclusive).
int index = randomGenerator.nextInt(defaultResponses.size());
return defaultResponses.get(index);
}
}

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Semester 1/Programming 1/Java/examples/projects/chapter14/tech-support-io/SupportSystem.ctxt Executable file
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#BlueJ class context
comment0.target=SupportSystem()
comment0.text=\nCreates\ a\ technical\ support\ system.\n\n
comment1.target=void\ start()
comment1.text=\nStart\ the\ technical\ support\ system.\ This\ will\ print\ a\ welcome\ message\ and\ enter\ninto\ a\ dialog\ with\ the\ user,\ until\ the\ user\ ends\ the\ dialog.\n\n
comment2.target=void\ printWelcome()
comment2.text=\nPrint\ a\ welcome\ message\ to\ the\ screen.\n\n
comment3.target=void\ printGoodbye()
comment3.text=\nPrint\ a\ good-bye\ message\ to\ the\ screen.\n\n
numComments=4

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Semester 1/Programming 1/Java/examples/projects/chapter14/tech-support-io/SupportSystem.java Executable file
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import java.util.HashSet;
/**
* This class implements a technical support system.
* It is the top level class in this project.
* The support system communicates via text input/output
* in the text terminal.
*
* This class uses an object of class InputReader to read input
* from the user, and an object of class Responder to generate responses.
* It contains a loop that repeatedly reads input and generates
* output until the users wants to leave.
*
* @author David J. Barnes and Michael Kölling.
* @version 2016.02.29
*/
public class SupportSystem
{
private InputReader reader;
private Responder responder;
/**
* Creates a technical support system.
*/
public SupportSystem()
{
reader = new InputReader();
responder = new Responder();
}
/**
* Start the technical support system. This will print a welcome message and enter
* into a dialog with the user, until the user ends the dialog.
*/
public void start()
{
boolean finished = false;
printWelcome();
while(!finished) {
HashSet<String> input = reader.getInput();
if(input.contains("bye")) {
finished = true;
}
else {
String response = responder.generateResponse(input);
System.out.println(response);
}
}
printGoodbye();
}
/**
* Print a welcome message to the screen.
*/
private void printWelcome()
{
System.out.println("Welcome to the DodgySoft Technical Support System.");
System.out.println();
System.out.println("Please tell us about your problem.");
System.out.println("We will assist you with any problem you might have.");
System.out.println("Please type 'bye' to exit our system.");
}
/**
* Print a good-bye message to the screen.
*/
private void printGoodbye()
{
System.out.println("Nice talking to you. Bye...");
}
}

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Semester 1/Programming 1/Java/examples/projects/chapter14/tech-support-io/default.txt Executable file
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That sounds odd. Could you describe that problem in more detail?
No other customer has ever complained about this before. What is your system configuration?
That sounds interesting. Tell me more...
I need a bit more information on that.
Have you checked that you do not have a dll conflict?
That is explained in the manual. Have you read the manual?
Your description is a bit wishy-washy. Have you got an expert there with you who could describe this more precisely?
That's not a bug, it's a feature!
Could you elaborate on that?

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Semester 1/Programming 1/Java/examples/projects/chapter14/tech-support-io/package.bluej Executable file
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#BlueJ package file
dependency1.from=SupportSystem
dependency1.to=InputReader
dependency1.type=UsesDependency
dependency2.from=SupportSystem
dependency2.to=Responder
dependency2.type=UsesDependency
objectbench.height=76
objectbench.width=842
package.editor.height=405
package.editor.width=734
package.editor.x=70
package.editor.y=80
package.numDependencies=2
package.numTargets=3
package.showExtends=true
package.showUses=true
project.charset=UTF-8
readme.editor.height=567
readme.editor.width=834
readme.editor.x=41
readme.editor.y=23
target1.editor.height=730
target1.editor.width=875
target1.editor.x=53
target1.editor.y=60
target1.height=60
target1.name=InputReader
target1.naviview.expanded=true
target1.showInterface=false
target1.type=ClassTarget
target1.typeParameters=
target1.width=130
target1.x=90
target1.y=210
target2.editor.height=725
target2.editor.width=1005
target2.editor.x=94
target2.editor.y=23
target2.height=60
target2.name=Responder
target2.naviview.expanded=true
target2.showInterface=false
target2.type=ClassTarget
target2.typeParameters=
target2.width=120
target2.x=350
target2.y=210
target3.editor.height=730
target3.editor.width=872
target3.editor.x=53
target3.editor.y=60
target3.height=60
target3.name=SupportSystem
target3.naviview.expanded=true
target3.showInterface=false
target3.type=ClassTarget
target3.typeParameters=
target3.width=130
target3.x=220
target3.y=90