Write a program to replace consecutive identical characters with a single '$'. For example, given the string 'Heelo Wworldd', the output should be 'H$lo $orl$'.

Question

Accepted Answer

The program replaces consecutive same characters in a string with a single '$'.

Iterate through each character in the string
Compare the current character with the next character
If they are the same, replace the next character with '$'
Continue until the end of the string

Accepted Answer

public static void main(String[] args) {

String str1;

// TODO Auto-generated method stub

String str = str1 = "Heelos Wworldd";

String s = "";

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

char c1 = str.charAt(i);

char c2 = str.charAt(i - 1);

if (Character.toLowerCase(c1) == Character.toLowerCase(c2)) {

// s=String.valueOf(c1)+String.valueOf(c2); or

s = Character.toString(c2) + Character.toString(c1);

str1 = str1.replace(s, "$");

}

System.out.println("NEW : " + str1); //this will give ans

}