Question

java programming

Problem 2 (25 points)
Counting Character Frequency. 

Write a program to analyze a text file (a novel or a report, or just a sequence of letters or symbols), 
by reading the file into a byte array, convert to a string, and then scan the string letter by letter to count the frequencies of all unique characters in the text, after that, the letters with frequencies greater than 0 and the frequencies are reported side by side. 
All members of the class can be static. 


For example if the text file test1.txt contains AAACMJKYYKNa1C 

Your output should look like 

Ascii code: the char: frequency

49: 1: 1

65: A: 3

67: C: 2

74: J: 1

75: K: 2

77: M: 1

78: N: 1

89: Y: 2

97: a: 1

Answer 1

`Hey,

Note: Brother in case of any queries, just comment in box I would be very happy to assist all your queries

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;

public class Main {
public static void bubbleSort(char arr[])
{
int n = arr.length;
for (int i = 0; i < n-1; i++)
for (int j = 0; j < n-i-1; j++)
if (arr[j] > arr[j+1])
{
// swap arr[j+1] and arr[i]
char temp = arr[j];
arr[j] = arr[j+1];
arr[j+1] = temp;
}
}
  
public static void main(String a[]) {
String file_name = "test1.txt"; // Enter your file path
InputStream fileReader = null;
HashMap<Character, Integer> countLetters = new HashMap<Character, Integer>(); //Hashmap to store Character and count of Character

String filedata = ""; // to store byteArray to String
try {
fileReader = new FileInputStream(file_name);
byte file_content[] = new byte[2 * 1024]; //initializing byte array
int read_count = 0;
while ((read_count = fileReader.read(file_content)) > 0) {
filedata = new String(file_content, 0, read_count); //converting byte array to string
}

char[] countOccurrence = filedata.toCharArray(); // converting string to char array to count letters Occurrences
int[] a1=new int[127];
for(int i=0;i<127;i++)
{
a1[i]=0;
}
for(int i=0;i<countOccurrence.length;i++)
{
a1[(int)countOccurrence[i]]++;
}
for(int i=0;i<127;i++)
{
if(a1[i]!=0)
System.out.println(i+" : "+(char)i+" : "+a1[i]);
}
  
} catch (FileNotFoundException e) {//handling file not found exception
e.printStackTrace();
} catch (IOException e) {// handling io exception
e.printStackTrace();
} finally {
try {
if (fileReader != null)
fileReader.close();//closing FileInputStream
} catch (Exception ex) {

}
}
}
}

Kindly revert for any queries

Thanks.