Question

I am taking a Intro Java course in college and for that, I need to make a Program to solve the following problem.

Our program is going to analyze the sentiment of the nintendo switch on Amazon by first gathering the positive percentage and the negative percentage of the product by looking at the customer reviews, and then display rather it is negative or positive based on the # of stars.

and my plans to solve the problem is down below,

• Plan:

  • Identify keywords that make a review “negative”

  • Identify keywords that make a review “positive”

  • Create and array that has a case “if _____” review positive count ++

  • Keep count of positive vs negative words

  • If countPositive == countNegative Print out review is neutral

  • Else if countPositive > countNegative print out review is positive

  • Else review is negative

    • Use stars (1 to 5) to determine how negative and how positive. And display that as a percent.   Now How can I create a Program based on that, and succesfully run it? Thanks in advance.

Answer 1

Below is the code with comments doing the tasks you are planning to do  

import java.text.DecimalFormat;
import java.util.Arrays;
import java.util.List;

public class Ratings {

    public static void main(String []args) {

        String feedback1 = "wordP1 wordN1 wordP1";
        String feedback2 = "wordN1 wordP1 wordN1";

        // prepare the list of all the positive words.
        List<String> positiveWords = Arrays.asList("wordP1");

        // similarly, prepare the list of all negative workds.
        List<String> negativeWords = Arrays.asList("wordN1");

        printReview(feedback1, positiveWords, negativeWords);
        printReview(feedback2, positiveWords, negativeWords);
    }

    /**
     * This method is responsible for printing the review.
     * @param feedback
     * @param positiveWords
     * @param negativeWords
     */
    private static void printReview(String feedback, List<String> positiveWords, List<String> negativeWords) {

        int positiveWordsCount = 0;
        int negativeWordsCount = 0;

        // split the feedback from space and gather it in an array.
        String [] feedbackWords = feedback.split(" ");

        // Now iterate over the feedback words to determine the count.
        for(String feedbackWord : feedbackWords) {
            if(positiveWords.contains(feedbackWord)) {
                positiveWordsCount ++;
            } else if(negativeWords.contains(feedbackWord)) {
                negativeWordsCount ++;
            }
        }

        // compute the overall feedback.
        double percentage = ((double )positiveWordsCount / (double)(positiveWordsCount + negativeWordsCount))*100;
        String review = null;
        
        // to make the percentage result to only 2 decimal places.
        DecimalFormat numberFormat = new DecimalFormat("#.00");

        if(positiveWordsCount == negativeWordsCount) {
            review = "Neutral";
        } else if(positiveWordsCount > negativeWordsCount) {
            review = "Positive";
        } else {
            review = "Negative";
            percentage = 100 - percentage;
        }

        System.out.println(review% + "  " + numberFormat.format(percentage));
    }
}

Sample Input1:

"wordP1 wordN1 wordP1"

Output:

66.67% Postive

Sample Input2:

wordN1 wordP1 wordN1

Output:

66.67% Negative

The screenshot with the sample inputs run are provided below.