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Count of a word in String Program - Java Programs

Write a program to enter a sentence from the keyboard and count the number of times a particular word occurs in it. Display the frequency of the search word.
Example:
INPUT:
Enter the sentence: the quick brown fox jumps over the lazy dog.
Enter a word to be searched: the
OUTPUT:
Searched word occurs 2 times.

Java


 import java.io.*;
class Frequency{
    public static void main(String args[])throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        System.out.print("Enter the sentence: ");
        String s = br.readLine();
        System.out.print("Enter the word to be searched: ");
        String key = br.readLine();
        String word = "";
        int count = 0;
        for(int i = 0; i < s.length(); i++){
            char ch = s.charAt(i);
            if(Character.isLetterOrDigit(ch))
                word += ch;
            else{
                if(word.equalsIgnoreCase(key))
                    count++;
                word = "";
            }
        }
        System.out.println("Searched word occurs " + count + " times.");
    }
}

Output

 
 OUTPUT  : 
Enter the sentence: the quick brown fox jumps over the lazy dog.
Enter the word to be searched: the
Searched word occurs 2 times.