CODEWITHSUNDEEP
javavalidation
plants tho
plants tho

Reputation: 47

How do you make java read and count the number of sentence input

Sample output:

Enter the essay: I like cats. Incorrect input! Your essay must contain at least 2 sentences, please try again:

Enter the essay: I like cats. I like dogs.

Your essay contains 2 sentences.

This is my code so far: 

System.out.print("Enter the essay: ");

String essay = input.nextLine();

do {
    System.out.print("Incorrect input! Your essay must contain at least 2 sentences, please try again: ");
    essay = input.nextLine();
} while (!(essay.contains(".")));

if (essay.contains(".")) {
    System.out.println("Your essay contains x sentences.");
}

There are many gaps and I don't know how to go about this program. Can you please help?

Upvotes: 1

Views: 1539

Answers (3)

Nissa
Nissa

Reputation: 4694

You can use a somewhat complex regular expression to split, and take the length:

Scanner input = new Scanner(System.in);

System.out.print("Enter the essay: ");

String essay = input.nextLine();
int sentenceCount = essay.split("\\S(\\s*[.!?])+(?!\\d)").length;

while (sentenceCount < 2) {
    System.out.print("Incorrect input! Your essay must contain at least 2 sentences, please try again: ");
    essay = input.nextLine();
    sentenceCount = essay.split("\\S(\\s*[.!?])+(?!\\d)").length;
}

System.out.printf("Your essay contains %d sentences.", sentenceCount);

Live demo on Ideone

Note that this additionally counts other sentence-terminating characters, and rejects other inputs that obviously aren't 2 sentences, such as:

  • ...
  • I didn't write one!!
  • WTF?!?!
  • Pi is 3.14159.

Upvotes: 4

R. Salame
R. Salame

Reputation: 21

This should work, and if you use Java 8 you do not need countStringOccurrences method.

import java.util.Scanner;

public class util {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        int count = 0;
        String pattern = ".";

        System.out.print("Enter your sentence:\n");
        String  essay = input.nextLine();

        //this is supported in Java 8 . Otherwise you need to implement method 
        int howmany = countStringOccurrences(essay, pattern);
        System.out.print("how many : " + howmany + "\n");

        while ( !(essay.contains(pattern) ) || howmany < 2) {

            System.out.print("Incorrect input! Your essay must contain at least 2 sentence, please try again:\n ");
            essay = input.nextLine();
            howmany = countStringOccurrences(essay, pattern);
        }

        int i = 0;
        // Keep calling indexOf for the pattern.
        while ((i = essay.indexOf(pattern, i)) != -1) {
            // Advance starting index.
            i += pattern.length();
            // Increment count.
            count++;
        }

        System.out.print("Your essay contains " + count + " sentences");   
    }

    private static int countStringOccurrences(String essay, String pattern) {
        // TODO Auto-generated method stub
        int i = 0;
        int count = 0;
        // Keep calling indexOf for the pattern.
        while ((i = essay.indexOf(pattern, i)) != -1) {
            // Advance starting index.
            i += pattern.length();
            // Increment count.
            count++;
        }

        return count;
    }

}

Upvotes: 1

Łukasz Chorąży
Łukasz Chorąży

Reputation: 644

Scanner scanner = new Scanner(System.in);

System.out.print("Enter the essay: ");
String essay = scanner.nextLine();

while (essay.split("[.]").length < 2) {
    System.out.println("Incorrect input! Your essay must contain at least 2 sentences, please try again: ");
    essay = scanner.nextLine();
}
System.out.println("Your essay contains " + essay.split("[.]").length + " sentences");

Upvotes: 0

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