java count frequency of characters in a string
public class Frequency { public static void main(String[] args) { String str = "picture perfect"; 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]); } } }