A class Extract is defined to get the text between the first and the last occurrences of a…

A class Extract is defined to get the text between the first and the last occurrences of a particular word from a sentence. In case the word occurs only once or does not occur at all, then the message gets displayed as “No such substring found”. Example: Input: Sentence - It is not true that I do not like coffee Word - not Output: true that I do The details of the members of the class are given below: Class name : Extract Data member/instance variable: text : to store the sentence Methods/Member functions: Extract( ) : constructor to initialise the data member with legal initial value void readSent( ) : to accept a sentence String extractText(String wrd) : to extract and return the substring between the first and the last occurrence of wrd from text void display( ) : to display the original sentence and the substring by invoking extractText( ) Specify the class Extract giving the details of the constructor( ), void readSent( ), String extractText(String) and void display( ). Define the main( ) function to create an object and call the functions accordingly to enable the task.

import java.util.Scanner;

class Extract
{
    String text;

    Extract()
    {
        text = "";
    }

    void readSent()
    {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a sentence: ");
        text = sc.nextLine();
    }

    String extractText(String wrd)
    {
        int first = text.indexOf(wrd);
        int last = text.lastIndexOf(wrd);
        if (first == -1 || first == last)
            return "No such substring found";
        int start = first + wrd.length();
        return text.substring(start, last).trim();
    }

    void display()
    {
        System.out.println("Original sentence: " + text);
        System.out.println("Substring: " + extractText("not"));
    }

    public static void main(String[] args)
    {
        Extract obj = new Extract();
        obj.readSent();
        obj.display();
    }
}