Great Soups a Thursday With Hotels and Blammer Wong Cornish College of the Arts

Lab 9: Sets in the Coffee Collection Framework For this week'southward lab,...

Lab 9: Sets in the Java Collection Framework

For this week'due south lab, you will use two of the classes in the Java Drove Framework:HashSet andTreeSet. You will employ these classes to implement a spell checker.

Set Methods

this lab, you lot volition demand to use some of the methods that are divers in the Set interface. Retrieve that if set is a Set, then the following methods are divers:

  • fix.size() -- Returns the number of items in the ready.
  • set.add(detail) -- Adds the item to the set, if it is non already there.
  • set.contains(item) -- Check whether the prepare contains the item.
  • gear up.isEmpty() -- Check whether the set is empty.

You will likewise need to be able to traverse a set, using either an iterator or a for-each loop.

Reading a Dictionary

The file words.txt (in the code directory) contains a list of English words, with one give-and-take on each line. Yous volition look upwardly words in this listing to cheque whether they are correctly spelled. To make the listing easy to use, you can shop the words in a set. Since at that place is no need to have the words stored in order, you can utilize aHashSet for maximum efficiency.

Employ a Scanner to read the file. You lot can create scanner,filein, for reading from a file with a statement such every bit:

                     filein = new Scanner

(new File("/classes/s09/cs225/words.txt"));

and that a file can be processed, token past token, in a loop such equally:

while (filein.hasNext()) {

     Cord tk = filein.adjacent();

     procedure(tk); // exercise something with the token

}

(For the wordlist file, a token is simply a word.)

Start your master plan by reading the words from words.txt and storing them in aHashSet<Cord>. For the purposes of this program,convert all words to lower case before putting them in the fix. To make certain that you've read all the words, check the size of the set. (It should be 72875.) You lot could also use the contains method to check for the presence of some mutual word in the prepare.

Checking the Words in a File

Once y'all accept the list of words in a set, it's like shooting fish in a barrel to read the words from a file and cheque whether each word is in the fix. Start by letting the user select a file. Yous tin can either let the user type the name of the file or you tin can use the following method:

        /**

         * Lets the user select an input file using a standard file

         * pick dialog box. If the user cancels the dialog

         * without selecting a file, the render value is nada.

         */

        static File getInputFileNameFromUser() {

           JFileChooser fileDialog = new JFileChooser();

           fileDialog.setDialogTitle("Select File for Input");

           int option = fileDialog.showOpenDialog(zip);

           if (option != JFileChooser.APPROVE_OPTION)

              return zero;

           else

              return fileDialog.getSelectedFile();

        }

Apply a Scanner to read the words from the selected file. In club to skip over any non-letter characters in the file, you tin can use the following command only after creating the scanner (where in is the variable name for the scanner):

in.useDelimiter("[^a-zA-Z]+");

(In this argument, "[^a-zA-Z]+" is a regular expression that matches any sequence of 1 or more than non-letter characters. This essentially makes the scanner care for any non-letter the way it would normally treat a space.)

Yous tin then become through the file, read each word (converting information technology to lower case) and check whether the set contains the word. At this point, just impress out whatever word that you find that is not in the dictionary.

Providing a Listing of Possible Correct Spellings

A spell checker shouldn't just tell you what words are misspelled -- it should likewise give y'all a list of possible correct spellings for that word. Write method

static TreeSet corrections(String badWord, HashSet lexicon)

that creates and returns aTreeSet<String> containing variations onbadWord that are contained in the dictionary. In your main program, when you observe a discussion that is not in the set of legal words, pass that word to this method (along with the set). Take the return value and output any words that it contains; these are the suggested correct spellings of the misspelled word. Here, for example, is role of the output from a sample program when it was run with the HTML source of this page as input:

html: (no suggestions)

cpsc: (no suggestions)

hashset: hash set

treeset: tree set

cvs: cs, vs

isempty: is empty

href: ref

txt: tat, tet, text, tit, tot, tut

filein: file in

pre: are, ere, ire, ore, skin, pee, per, pie, poe, pore, prep, pres,

      prey, pro, pry, pure, pyre, re

hasnext: has side by side

wordlist: word list

getinputfilenamefromuser: (no suggestions)

jfilechooser: (no suggestions)

filedialog: file dialog

setdialogtitle: (no suggestions)

int: ant, dint, hint, in, ina, inc, ind, ink, inn, ins, inti, into,

     it, lint, mint, nit, pint, tint

Note that the plan was written so that it will not output the aforementioned misspelled word more than than in one case. (This is done past keeping a gear up of misspelled words that take been output.) If thecorrections() method returns an empty ready, the programme outputs the message "(no suggestions)". Since the corrections are stored in a tree set, they are automatically printed out in alphabetical order with no repeats.

The possible corrections that the plan considers are equally follows:

• Delete any one of the letters from the misspelled give-and-take.

• Modify any alphabetic character in the misspelled word to any other letter.

• Insert whatever alphabetic character at any point in the misspelled word.

• Swap whatsoever 2 neighboring characters in the misspelled word.

• Insert a infinite at any point in the misspelled word (and cheque that both of the words that are produced are in the lexicon)

For constructing the possible corrections, you will have to make extensive utilize of substrings. If w is a string, thenwestward.substring(0,i) is the string consisting of the commencement i characters in w (not including the character in position i, which would be character numberi+ane). Andw.substring(i) consists of the characters of westward from position i through the end of the string. For example, ifch is a character, then you can change thei-thursday graphic symbol of w to ch with the statement:

String s = w.substring(0,i) + ch + due west.substring(i+1);

Also, you volition notice it convenient to use afor loop in which the loop control variable is achar:

for (char ch = 'a'; ch <= 'z'; ch++) { ...

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