Slip 10 - A) Write a java program to count the frequency of each character in a given string.

Solution: 

public class Slip10A   

{  

     public static void main(String[] args) {  

        String str = "Coding Activity";  

        int[] freq = new int[str.length()];  

        int i, j;  

          

        //Converts given string into character array  

        char string[] = str.toCharArray();  

          

        for(i = 0; i <str.length(); i++) {  

            freq[i] = 1;  

            for(j = i+1; j <str.length(); j++) {  

                if(string[i] == string[j]) {  

                    freq[i]++;  

                      

                    //Set string[j] to 0 to avoid printing visited character  

                    string[j] = '0';  

                }  

            }  

        }  

          

        //Displays the each character and their corresponding frequency  

        System.out.println("Characters and their corresponding frequencies");  

        for(i = 0; i <freq.length; i++) {  

            if(string[i] != ' ' && string[i] != '0')  

                System.out.println(string[i] + "-" + freq[i]);  

        }  

    }  

}

Output: