Design a program that reads an ASCII text file (provided) one byte at a time and produces an output file that contains the frequency count of how many times each character appears in the input file. Do not sort the output. A character frequency class instance must be used to represent each unique character in the file (see below). For this exercise, the character frequency objects must be processed and stored using an array.
I have tried creating an object of Character Frequencies and using an equals method to compare it with input.
The array is supposed to be storing new characters and frequency of characters but it is also storing duplicates and frequency is not accurate.
public class CharacterFrequency {
//Stores character by character from input file to check if its in ASCII
array
private static char character;
//Stores number of times character shows up in input file
private static int frequency = 0;
private static CharacterFrequency arr[] = new CharacterFrequency[256];
//Constructor class for CharacterFrequency
public CharacterFrequency(char character, int frequency){
setCharacter(character);
setFrequency(frequency);
}
public static void main(String[] args){
//initiate object array to store character and frequency variables
File file = new File("C:/Users/alber/Desktop/sample.txt");
if (!file.exists()) {
System.out.println(args[0] + " does not exist.");
return;
}
if (!(file.isFile() && file.canRead())) {
System.out.println(file.getName() + " cannot be read from.");
return;
}
try {
FileReader fr = new FileReader("C://Users/alber/Desktop/sample.txt");
//loop through character array
for(int i = 0; i < arr.length; i++){
//read file character by character until no characters
are left and store character each time
int j = 0;
while ((j=fr.read()) != -1){
character = (char)j;
//if character is in the array already do not add
it just call increment method
//if(arr[i].equals(character)){
if(arr[i] == null || (!
(arr[i].equals(character)))){
arr[i] = new
CharacterFrequency(character,frequency);
System.out.println(arr[i]);
//if character is not in the array add it to it
}else{
increment();
}//end else
}//end while
}//end for
fr.close();
} catch (IOException e) {
e.printStackTrace();
}
}
public char getCharacter(){
return character;
}
public static void setCharacter(char character){
}
public int getFrequency(){
return frequency;
}
public void setFrequency(int frequency){
this.frequency = frequency;
}
public static void increment(){
frequency++;
}
@Override
public boolean equals(Object obj){
if(obj == null || obj.getClass()!= this.getClass()){
return false;
}
if(obj == this){
return true;
}
CharacterFrequency c = (CharacterFrequency)obj;
return CharacterFrequency.character == this.character && CharacterFrequency.frequency == this.frequency;
}
public String toString(){
return character + " " + frequency;
}
}
