------------------------------ WordData : import java.util.ArrayList; public cla
ID: 3913390 • Letter: #
Question
------------------------------
WordData :
import java.util.ArrayList;
public class WordData {
private String word;
private ArrayList<Integer> lineNumbers;
private int WordCount;
public WordData(String word, ArrayList<Integer> lineNumbers, int wordCount) {
this.word = word;
this.lineNumbers = lineNumbers;
WordCount = wordCount;
}
public String getWord() {
return word;
}
public ArrayList<Integer> getLineNumbers() {
return lineNumbers;
}
public int getWordCount() {
return WordCount;
}
public void setWord(String word) {
this.word = word;
}
public void setLineNumbers(ArrayList<Integer> lineNumbers) {
this.lineNumbers = lineNumbers;
}
public void setWordCount(int wordCount) {
WordCount = wordCount;
}
@Override
public String toString() {
String res = word + " appears " + WordCount + " times on " + lineNumbers.size() + " lines: ";
int i=0;
for(i=0;i<14 && i < lineNumbers.size();i++) {
res += lineNumbers.get(i) + ",";
}
res +=( lineNumbers.get(i) +"..." + lineNumbers.get(lineNumbers.size()-1));
return res;
}
@Override
public boolean equals(Object other) {
// TODO Auto-generated method stub
WordData obj = (WordData) other;
return word.equals(obj.word);
}
int compareTo(Object other) {
WordData obj = (WordData) other;
if(this.WordCount > obj.WordCount) {
return -1;
}else if(this.WordCount == obj.WordCount) {
return 0;
}
else
return 1;
}
}
----------------------
TestA4 :
public class TestA4 {
public static void main(String[] args) {
WordDataArrayList test = new WordDataArrayList();
try{
System.out.println("Testing WordDataArrayList basic operation: "+
"===========================================");
System.out.println("Should be empty list: "+test+" ----------");
test.add(99,"at");
System.out.println("Should be at(1 1)(99): "+test+" ----------");
test.add(103,"at");
System.out.println("Should be at(2 2)(99 103): "+test+" ----------");
test.add(103,"be");
System.out.println("Should be at(2 2)(99 103) and be(1 1)(103): "+test+" ----------");
}
catch(Exception e){
System.out.println("Basic WordDataArrayList tests failed");
}
try{
System.out.println(" Testing WordData equals and compareTo: "+
"======================================");
System.out.println("should be false: "+test.get(0).equals(test.get(1)));
System.out.println("should be true: "+test.get(0).equals(test.get(0)));
System.out.println("negative/positive may be reversed if "be" comes before "at":");
System.out.println("should be negative: "+test.get(0).compareTo(test.get(1)));
System.out.println("should be 0: "+test.get(0).compareTo(test.get(0)));
System.out.println("should be positive: "+test.get(1).compareTo(test.get(0)));
}
catch(Exception e){
System.out.println("WordData equals/compareTo tests failed");
}
try{
System.out.println(" Testing WordDataArrayList additional operation: "+
"===============================================");
for(int i=0; i<10; i++) test.add(111,"do");
System.out.println("Should be at(2 2)(99 103); be(1 1)(103); do(10 1)(111): "+test+" ----------");
test.add(111,"at");
test.add(111,"be");
test.add(111,"at");
System.out.println("Should be at(4 3)(99 103 111); be(2 2)(103 111); do(10 1)(111): "+test+" ----------");
for(int i=0; i<30; i++) test.add(200+i,"lots");
System.out.println("Now adds lots(30 30)(200,201,etc,214...229): "+test+" ----------");
}
catch(Exception e){
System.out.println("Extra WordDataArrayList tests failed");
}
try{
System.out.println(" Testing WordScanner operation: "+
"==============================");
WordScanner WordScanner("test-one-two",1);
String word;
System.out.println("Should be test one two null:");
do{
System.out.print((word = one.nextWord())+" ");
}while(word!=null);
System.out.println();
WordScanner two = new WordScanner("'t'e's't' O/N/E 2t2 t@h.r.e.e ",1);
System.out.println("Should be test one t three null:");
do{
System.out.print((word = two.nextWord())+" ");
}while(word!=null);
System.out.println();
}
catch(Exception e){
System.out.println("WordScanner tests failed");
}
}
}
Explanation / Answer
Here is the completed code for this problem. Comments are included, go through it, learn how things work and let me know if you have any doubts. Thanks
// WordDataArrayList.java
import java.util.ArrayList;
public class WordDataArrayList extends ArrayList<WordData> {
/**
* method to add the occurrence of a word on a line
*/
public void add(int line, String word) {
/**
* defining an array list of integers to create a new WordData object
*/
ArrayList<Integer> lines = new ArrayList<Integer>();
//adding the given line number
lines.add(line);
//creating a word data object
WordData w = new WordData(word, lines, 1);
//checking if the list already contains the given word
if (contains(w)) {
//getting the index of the word data
int index = indexOf(w);
//checking if the current line number is already added
if (!get(index).getLineNumbers().contains(line)) {
//adding the line number
get(index).getLineNumbers().add(line);
}
//incrementing the word count
get(index).setWordCount(get(index).getWordCount() + 1);
} else {
//word not on the list, adding it
super.add(w);
}
}
@Override
public String toString() {
String data = "";
/**
* iterating through all word data elements and appending to a String variable in proper format
*/
for (int i = 0; i < size(); i++) {
WordData w = get(i);
data += w.getWord() + "(" + w.getWordCount() + " "
+ w.getLineNumbers().size() + ")";
data += "(";
for (int j = 0; j < w.getLineNumbers().size(); j++) {
data += w.getLineNumbers().get(j) + " ";
}
data += "); ";
}
return data;
}
}
/*OUTPUT (using the given test program)*/
Testing WordDataArrayList basic operation:
===========================================
Should be empty list:
----------
Should be at(1 1)(99):
at(1 1)(99 );
----------
Should be at(2 2)(99 103):
at(2 2)(99 103 );
----------
Should be at(2 2)(99 103) and be(1 1)(103):
at(2 2)(99 103 ); be(1 1)(103 );
----------
Testing WordData equals and compareTo:
======================================
should be false: false
should be true: true
negative/positive may be reversed if "be" comes before "at":
should be negative: -1
should be 0: 0
should be positive: 1
Testing WordDataArrayList additional operation:
===============================================
Should be at(2 2)(99 103); be(1 1)(103); do(10 1)(111):
at(2 2)(99 103 ); be(1 1)(103 ); do(10 1)(111 );
----------
Should be at(4 3)(99 103 111); be(2 2)(103 111); do(10 1)(111):
at(4 3)(99 103 111 ); be(2 2)(103 111 ); do(10 1)(111 );
----------
Now adds lots(30 30)(200,201,etc,214...229):
at(4 3)(99 103 111 ); be(2 2)(103 111 ); do(10 1)(111 ); lots(30 30)(200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 );
----------
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