Public class filetext { private string filename; private int filebytes; private arraylist‹string› wordlist; // the contents of the text file // constructors not shown // postcondition: calculates the number of bytes in this file and updates // the instance variable filebytes public void filesize() { } // precondition: 0 < newwords. length < wordlist. size () // postcondition: elements from the newwords array are placed into consecutive // odd index positions of the wordlist arraylist // postcondition: the value of filebytes is updated public void mergewords(string[] newwords) { } // other methods not shown }the wordlist arraylist stores the words (tokens) found in a text file. suppose wordlist contains the following elements: [mary, had, a, little, lamb]the filesize method; the size of the file is computed in bytes. each character in a word counts as one byte. in addition, there is a space in between each word, and each of those spaces also counts as one byte. for the example above, the filesize method would compute 4 + 3 + 1 + 6 + 4 as the sum of the lengths of each string in the arraylist. the value of filebytes would be this sum plus 4, because there would be 4 spaces in between the 5 words. for the mergewords method, assume the values for the newwords array are as follows: {"one", "two", "three"}after the method has executed, filebytes will have an updated value, and wordlist would contain the following elements: [mary, one, had, two, a, three, little, lamb]