Counting the frequency of numbers inside a text file

[PC_flea]

I have a source code here that counts the frequency of alphabetic characters and non-alphabetic characters (see the source code below).

import java.io.*;

public class letterfrequency {
	public static void main (String [] args) throws IOException {
		File file1 = new File ("letternumberfrequency.txt");
		BufferedReader in = new BufferedReader (new FileReader (file1));
		
		int nextChar;
		int other = 0;
		char ch;
		
		int [] count = new int [26];
		
		while ((nextChar = in.read())!= -1) {
			ch = ((char)nextChar);
			ch = Character.toLowerCase (ch);
			if (ch >= 'a' && ch <= 'z')
			  count [ch- 'a']++;
			else
			  other ++;
		}
		
		for (int i=0; i<26; i++){
			System.out.printf ("%c = %d \n", i+ 'A', count [i]);
		}
		
		System.out.println ("Non-alphabetic characters: " + other);
		in.close ();
	}
}

But, let's just say that now I have the following characters in the text file, "letternumberfrequency.txt":
71 geese - 83 cars - 58 cows- 64 mooses- 100 ants- 69 bangles- 90 molehills - 87 noses

The numbers inside that text file would be considered as strings, am I right?
But I want to extract the numbers so that I can also be able to count their frequency - not as individual digits but as whole numbers (that is how many "71", "83", "58", "64", etc. are there...).
Would using "Double.parseDouble ()" help?