Question

Write the following program in Java:

You are to write a Java program that reads an input file containing a list of words and their synonyms. You will repeatedly ask the user if they want to look up the synonyms of a word, add a new synonym for a word, or quit. Here is a sample run of the program (note that the program is expecting the input file, thesaurus.txt to be in the working directory for the code.): Enter (l)ookup, (a)dd entry, or (aDuit: l Enter word: graphic Result: explicit, descriptive, pictorial, lifelike, vivid Enter (l)ookup, (a)dd entry, or (qDuit: A Enter word: graphic Enter synonym: explicit Error: cannot add entry Enter (l)ookup, (a)dd entry, or (q)uit:l Enter word: hilarious Result: uproarious Enter (l)ookup, (a)dd entry, or(q)uit: a Enter word: Hilarious Enter synonym: very funny Enter (l)ookup, (a)dd entry, or (q)uit:l Enter word: hilarious Result: uproarious, very funny Enter (l)ookup, (a)dd entry, or (q)uit:l Enter word: miniscule Result: miniscule not found Enter (l)ookup, (a)dd entry, or(q)uit: a Enter word: miniscule Enter synonym: very small Enter (l)ookup, (a)dd entry, or(q)uit: IL Enter word: miniscule Result: very small Enter (l)ookup, (a)dd entry, or(q)uit: q

Answer 1

Entry.java:

package thesaurus;

class Entry

{

private static final int MAX_SYNONYMS = 10;

private String word;

private String[] synonyms;

private int synCount;

Entry(String word)

{

this.word = word;

this.synonyms = new String[MAX_SYNONYMS];

synCount = 0;

}

public String getWord()

{

return this.word;

}

public boolean addSynonym(String syn)

{

if(synCount < synonyms.length)

{

for(int i=0; i<synCount; i++)

{

if(isSynonym(syn)) return false;

}

synonyms[synCount++] = syn;

return true;

}

return false;

}

public String getSynonyms()

{

StringBuilder sb = new StringBuilder();

for(int i=0; i<synCount-1; i++)

{

sb.append(synonyms[i] + ", ");

}

sb.append(synonyms[synCount-1]);

return sb.toString();

}

public boolean isSynonym(String syn)

{

for(int i=0; i<synCount; i++)

{

if(synonyms[i].equalsIgnoreCase(syn)) return true;

}

return false;

}

}

Thesaurus.java:

package thesaurus;

class Thesaurus

{

private static final int MAX_ENTRIES = 7000;

Entry[] entries;

int entryCount;

Thesaurus()

{

entries = new Entry[MAX_ENTRIES];

entryCount = 0;

}

public Entry getEntry(String word)

{

for(int i=0; i<entryCount; i++)

{

if(entries[i].getWord().equalsIgnoreCase(word))

return entries[i];

}

return null;

}

public boolean addEntry(String word, String syn)

{

Entry entry = getEntry(word);

if(entry == null && entryCount < entries.length)

{

entry = new Entry(word);

entry.addSynonym(syn);

entries[entryCount++] = entry;

return true;

}

else if(entry != null)

{

return entry.addSynonym(syn);

}

else return false;

}

public String lookup(String word)

{

Entry entry = getEntry(word);

if(entry != null)

{

return entry.getSynonyms();

}

return word + " not found";

}

}

Proj6.java:

package thesaurus;

import java.io.File;

import java.io.FileNotFoundException;

import java.util.Scanner;

class Proj6

{

public static void main(String[] args) throws FileNotFoundException

{

Thesaurus thesaurus = new Thesaurus();

Scanner inputFile = new Scanner(new File("thesaurus.txt"));

while(inputFile.hasNextLine())

{

// take the 1st word in the line as word.

String word = inputFile.next();

// read rest of the string of the line.

// then split it based on whitespace delimiter.

String[] syns = inputFile.nextLine().split(" ");

// for each of the synonym

for(String syn : syns)

{

// add the word and synonym to the thesaurus.

if(!thesaurus.addEntry(word, syn))

{

System.out.println("Error adding synonym " + syn + " for the word " + word);

}

}

}

inputFile.close();

Scanner in = new Scanner(System.in);

while(true)

{

System.out.print("Enter (l)ookup, (a)dd entry, or (quit): ");

String userSelection = in.nextLine().toLowerCase();

switch(userSelection)

{

case "l":

System.out.print("Enter word: ");

Entry e = thesaurus.getEntry(in.nextLine());

System.out.println("Result: " + e.getSynonyms());

break;

case "a":

System.out.print("Enter word:");

String word = in.nextLine();

System.out.print("Enter synonym: ");

String syn = in.nextLine();

if(!thesaurus.addEntry(word, syn))

System.out.println("Error: Can't add entry");

break;

case "q": in.close(); return;

}

}

}

}

SAMPLE OUTPUT: