3.

This question involves a class named TextFile that represents a text file. public class TextFile { private String fileName; private ArrayList words; // constructors not shown // postcondition: returns the number of bytes in this file public int fileSize() { } // precondition: 0 <= index < words.size() // postcondition: removes numWords words from the words ArrayList beginning at // index. public void deleteWords(int index, int numWords) { } // precondition: 0 <= index <= words.size() // postcondition: adds elements from newWords array to words ArrayList beginning // at index. public void addWords(int index, String[] newWords) { } // other methods not shown } Complete the addWords() method. This method adds the elements from the newWords array to the words ArrayList, beginning at the given index. The index parameter is assumed to be greater than or equal to 0, and less than or equal to the size of the ArrayList, so that its value is either a valid index into the ArrayList, or it indicates that the words are to be added to the end of the ArrayList. // precondition: 0 <= index <= words.size() // postcondition: adds elements from newWords array to words ArrayList beginning // at index. public void addWords(int index, String[] newWords) { }