URLify a given string Java

PROGRAM TO URLify A GIVEN STRING

class MAIN

{

 

    // Maximum length of string

    // after modifications.

    static int MAX = 1000;

 

    // Replaces spaces with %20 in-place

    // and returns new length of modified string.

    // It returns -1 if modified string

    // cannot be stored in str[]

    static char[] replaceSpaces(char[] str)

    {

 

        // count spaces and find current length

        int space_count = 0, i = 0;

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

            if (str[i] == ' ')

                space_count++;

 

        // count spaces and find current length

        while (str[i - 1] == ' ')

        {

            space_count--;

            i--;

        }

 

        // Find new length.

        int new_length = i + space_count * 2;

 

        // New length must be smaller than length

        // of string provided.

        if (new_length > MAX)

            return str;

 

        // Start filling character from end

        int index = new_length - 1;

 

        char[] old_str = str;

        str = new char[new_length];

 

        // Fill rest of the string from end

        for (int j = i - 1; j >= 0; j--)

        {

 

            // inserts %20 in place of space

            if (old_str[j] == ' ')

            {

                str[index] = '0';

                str[index - 1] = '2';

                str[index - 2] = '%';

                index = index - 3;

            }

             

            else

            {

                str[index] = old_str[j];

                index--;

            }

        }

        return str;

    }

 

    // Driver Code

    public static void main(String[] args)

    {

        char[] str = "Mr John Smith ".toCharArray();

 

        // Prints the replaced string

        str = replaceSpaces(str);

 

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

            System.out.print(str[i]);

    }

}




OUTPUT

Mr%20John%20Smith

CREDITS: https://www.geeksforgeeks.org/urlify-given-string-replace-spaces/