[Solved] Adjacent characters with Java

Adjacent characters: Given a string, write a program to compute a new string where identical chars that are adjacent in the original string are separated from each other by a “*”

Input and Output Format:

Refer sample input and output for formatting specifications.

All text in bold corresponds to input and the rest corresponds to output.

Sample Input and Output :

Enter the string

hello

The processed string is hel*lo

Solution

import java.util.Scanner;
class Main {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("Enter the string");
        String str = input.nextLine();
        //sauravhathi
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < str.length(); i++) {
            if (i == 0) {
                sb.append(str.charAt(i));
            } else if (str.charAt(i) == str.charAt(i - 1)) {
                sb.append("*");
                       //sauravhathi
                sb.append(str.charAt(i));
            } else {
                       //sauravhathi
                sb.append(str.charAt(i));
            }

       //sauravhathi
        }
        System.out.println("The processed string is "+sb.toString());
    }
}

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