String programs part 4

Write a program to input a sentence and print the frequency of the double occurrence characters.

import java.io.*;
class DoubleOccur
{
    public static void main()throws IOException
    {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Enter a sentence");
        String str= br.readLine();
        int len=str.length(); 
        int count=0;
        for (int i=0;i<len-1;i++)
        {
            char ch=str.charAt(i);
            char ch1=str.charAt(i+1);
            if(ch==ch1)
                count++;
        }
        System.out.println("The frequency of the double occurrence is"+count);
    }
}

Output:-
I am good
The frequency of the double occurrence is: 1

Write a program to input a sentence and a word and print the frequency of the word in a sentence.

import java.io.*;
class WordFrequency
{
    public static void main()throws IOException
    {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Enter a sentence");
        String str= br.readLine();
       System.out.println("Enter a word to check for the frequncy");
        String wrd= br.readLine();
         int len=str.length(); 
        int d=0; int count=0;
        for (int i=0;i<len;i++)
        {
            char ch=str.charAt(i);
            if(Character.isWhitespace(ch))
            {
                String temp=str.substring(d,i);
                d=i;
                if(temp.equals(wrd)
                count++;
               System.out.println(“The frequency of the word is”+count);
            }
        }
    }
}

Output:-
Enter a sentence
This is a school
Enter a word
school
The frequency of the word is 1