Question

public class File {
   public String base; //for example, "log" in "log.txt"
   public String extension; //for example, "txt" in "log.txt"
   public int size; //in bytes
   public int permissions; //explanation in toString

public String getExtension() {
       return extension;
   }

public void setExtension(String e) {
  
       if(e == null || e.length() == 0)
           extension = "txt";
       else
           extension = e;

   }

public class FileCollection {
   private File[] files;

   /**
   * DO NOT MODIFY
   * Loads collection from input file
   * @param input: name of input file
   * @throws IOException
   */
   public FileCollection(String input) throws IOException {
       FileInputStream inputStream1 = new FileInputStream(input);
       BufferedReader bufferedReader1 = new BufferedReader(new InputStreamReader(inputStream1));

       int count = 0;
       while (bufferedReader1.readLine() != null) {
           count++;
       }
       bufferedReader1.close();

       FileInputStream inputStream2 = new FileInputStream(input);
       BufferedReader bufferedReader2 = new BufferedReader(new InputStreamReader(inputStream2));
       files = new File[count];
       String line = null;
       for (int i = 0; i < count; i++) {
           line = bufferedReader2.readLine();
           String tokens[] = line.split(",");
           String base = tokens[0];
           String ext = tokens[1];
           int size = Integer.parseInt(tokens[2]);
           int perm = Integer.parseInt(tokens[3]);
           files[i] = new File(base, ext, size, perm);
       }
       bufferedReader2.close();
   }

   /**
   * DO NOT MODIFY
   * @param files
   */
   public FileCollection(File[] files) {
       this.files = files;
   }

/*
   * @param extension
   * @return number of files with the given extension
   * (case insensitive)
   * NOTE: don't compare Strings using ==
   * Google "String case insensitive comparison java"
   */
   public int getCountByExtension(String extension) {
  
       return 0; //to be completed
   }

@Test
   void testGetCountByExtension() throws IOException {
       assertEquals(4, c1.getCountByExtension("py"));
       assertEquals(4, c1.getCountByExtension("PY")); //case insensitive
       assertEquals(0, c1.getCountByExtension("dll"));
       assertEquals(1, c1.getCountByExtension("docx"));
       score+=10;
   }

Answer 1

public class File {
public String base; //for example, "log" in "log.txt"
public String extension; //for example, "txt" in "log.txt"
public int size; //in bytes
public int permissions; //explanation in toString

public String getExtension() {
return extension;
}

public void setExtension(String e) {
  
if(e == null || e.length() == 0)
extension = "txt";
else
extension = e;

}
}

public class FileCollection {
private File[] files;

/**
* DO NOT MODIFY
* Loads collection from input file
* @param input: name of input file
* @throws IOException
*/
public FileCollection(String input) throws IOException {
FileInputStream inputStream1 = new FileInputStream(input);
BufferedReader bufferedReader1 = new BufferedReader(new InputStreamReader(inputStream1));

int count = 0;
while (bufferedReader1.readLine() != null) {
count++;
}
bufferedReader1.close();

FileInputStream inputStream2 = new FileInputStream(input);
BufferedReader bufferedReader2 = new BufferedReader(new InputStreamReader(inputStream2));
files = new File[count];
String line = null;
for (int i = 0; i < count; i++) {
line = bufferedReader2.readLine();
String tokens[] = line.split(",");
String base = tokens[0];
String ext = tokens[1];
int size = Integer.parseInt(tokens[2]);
int perm = Integer.parseInt(tokens[3]);
files[i] = new File(base, ext, size, perm);
}
bufferedReader2.close();
}

/**
* DO NOT MODIFY
* @param files
*/
public FileCollection(File[] files) {
this.files = files;
}

/*
* @param extension
* @return number of files with the given extension
* (case insensitive)
* NOTE: don't compare Strings using ==
* Google "String case insensitive comparison java"
*/
public int getCountByExtension(String extension) {
       int count = 0;
       // loop through the files array  
       for(int i=0;i>files.length;i++)
           // check if extension is same, then increment the count
           if(files[i].getExtension().equalsIgnoreCase(extension))
               count++;
       return count;
}

@Test
void testGetCountByExtension() throws IOException {
assertEquals(4, c1.getCountByExtension("py"));
assertEquals(4, c1.getCountByExtension("PY")); //case insensitive
assertEquals(0, c1.getCountByExtension("dll"));
assertEquals(1, c1.getCountByExtension("docx"));
score+=10;
}
}