Java Community | Help. Code. Learn.•15mo ago

My collections list wont print

i'm not sure why

14 Replies

JavaBot•15mo ago

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Hey @Mike B! Please use /close or the Close Post button above when your problem is solved. Please remember to follow the help guidelines. This post will be automatically closed after 300 minutes of inactivity.

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Mike BOP•15mo ago

how do i post code its too long

dan1st•15mo ago

split it in two messages?

Mike BOP•15mo ago

isnt there a site to format it all quickly

dan1st•15mo ago

or only post the relevant parts

JavaBot•15mo ago

Please format your code & make it more readable. For the java programming language, it should look like this:

```java public class Main{ public static void main(String[] args){ System.out.println("Hello World!"); } }```

• These are backticks, not quotes.

Mike BOP•15mo ago

 public static void main(String[] args) throws FileNotFoundException {
        Scanner file = new Scanner(new File("/Users/michaelbalogun/Desktop/Lab11/src/main/java/applicant_data.csv"));
        ArrayList<candidate> applicants = new ArrayList<>();

        DecimalFormat round = new DecimalFormat("#.##");

        while (file.hasNextLine()) {
            String line = file.nextLine();
            String[] candidates = line.split(",");
            if (candidates.length >= 9) {
                try {

                    candidate c = new candidate(candidates[0], candidates[1], candidates[2], candidates[3], candidates[4], candidates[5], candidates[6], candidates[7],
                            Double.parseDouble(candidates[8]), candidates[9], candidates[10]);
                    applicants.add(c);
                } catch (NumberFormatException e) {
                }
            }

        }

        ArrayList<candidate> finalists = new ArrayList<>();
        for (candidate c : applicants) {
            String s1 = c.languages.toLowerCase();
            if (s1.contains("java")) {
                finalists.add(c);
            }
        }

        Collections.sort(finalists);
        System.out.println("The list of top 10 selected Java students are: ");
        for (int i = 0; i < Math.min(10, finalists.size()); i++) {
            System.out.println(finalists.get(i));
        }
    }

 public static void main(String[] args) throws FileNotFoundException {
        Scanner file = new Scanner(new File("/Users/michaelbalogun/Desktop/Lab11/src/main/java/applicant_data.csv"));
        ArrayList<candidate> applicants = new ArrayList<>();

        DecimalFormat round = new DecimalFormat("#.##");

        while (file.hasNextLine()) {
            String line = file.nextLine();
            String[] candidates = line.split(",");
            if (candidates.length >= 9) {
                try {

                    candidate c = new candidate(candidates[0], candidates[1], candidates[2], candidates[3], candidates[4], candidates[5], candidates[6], candidates[7],
                            Double.parseDouble(candidates[8]), candidates[9], candidates[10]);
                    applicants.add(c);
                } catch (NumberFormatException e) {
                }
            }

        }

        ArrayList<candidate> finalists = new ArrayList<>();
        for (candidate c : applicants) {
            String s1 = c.languages.toLowerCase();
            if (s1.contains("java")) {
                finalists.add(c);
            }
        }

        Collections.sort(finalists);
        System.out.println("The list of top 10 selected Java students are: ");
        for (int i = 0; i < Math.min(10, finalists.size()); i++) {
            System.out.println(finalists.get(i));
        }
    }

System.out.println(finalists.get(i)); wont print

dan1st•15mo ago

Can you print finalists.size() before the loop? Does that work? Also

JavaBot•15mo ago

It looks like you are having issues with debugging or issues that can be solved using a debugger. Check out this article on dev.java to see how debugging works and how to use a debugger. This Stack Overflow question and its answers also explain debugging in general. These links describe how to use the debugger in some IDEs: • Debugging in IntelliJ • Debugging in Eclipse

Mike BOP•15mo ago

size is 0 not to sure why i thoughti added to it

Kyo-chan•15mo ago

Well it's better to check than to think You should display information at all stages, was the split correct, are the fields where they're expected, is "java" there where expected... Ideally with a debugger, but you can make do with whatever you know in the beginning

Mike BOP•15mo ago

trying to trace right now after tracing thorugh the error has to come from for soem reason my applicants gets added to but i cant add to my finalists

 ArrayList<candidate> finalists = new ArrayList<>();
        for (candidate x : applicants) {
            String lang = x.languages.toLowerCase();
            if (lang.contains("java")) {
                finalists.add(x);
            }
        }

        Collections.sort(finalists);
        System.out.println(finalists.size());
        System.out.println("The list of top 10 selected Java students are: ");
        for (int i = 0; i < Math.min(10, finalists.size()); i++) {
            System.out.println(finalists.get(i));
        }
    }

 ArrayList<candidate> finalists = new ArrayList<>();
        for (candidate x : applicants) {
            String lang = x.languages.toLowerCase();
            if (lang.contains("java")) {
                finalists.add(x);
            }
        }

        Collections.sort(finalists);
        System.out.println(finalists.size());
        System.out.println("The list of top 10 selected Java students are: ");
        for (int i = 0; i < Math.min(10, finalists.size()); i++) {
            System.out.println(finalists.get(i));
        }
    }

dan1st•15mo ago

maybe none of the languages contain java?

JavaBot•15mo ago

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