Java Community | Help. Code. Learn.•4w ago

Error related to arguments in a method

so i'm getting this error

java compiler: method readMessages in class Main cannot be applied to given types; required: no arguments found: java.lang.String,Message[] reason: actual and formal argument lists differ in length

but i my readMessages method doesn't require any arguments

14 Replies

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akumaOP•4w ago

also that error is when codegrade runs it, if i run the code myself, it runs fine What can be the issue? Thank you in advance to anyone who decides to help

JavaBot•4w ago

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akumaOP•4w ago

For now I'm gonna go to bed since it's midnight here almost so I won't be able to respond to texts immediately

dan1st•4w ago

Can you show the relevant code?

JavaBot•4w ago

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akumaOP•4w ago

import java.util.*;
import java.io.*;

public class Main {
    public static String[] messages;
    public static void main(String[] args) {
        readMessages();
        writeConversation();
    }

import java.util.*;
import java.io.*;

public class Main {
    public static String[] messages;
    public static void main(String[] args) {
        readMessages();
        writeConversation();
    }

uh hold on i'll send the methods

public static void readMessages() {
        try {
            Scanner reader1 = new Scanner(new File("Person1.txt"));
            Scanner reader2 = new Scanner(new File("Person2.txt"));
            String[] messages1 = new String[10];
            String[] messages2 = new String[10];
            int i = 0;
            int j = 0;
            
            while (reader1.hasNextLine()) {
                messages1[i] = reader1.nextLine();
                i++;
            }

            while (reader2.hasNextLine()) {
                messages2[j] = reader2.nextLine();
                j++;
            }

            reader1.close();
            reader2.close();

            messages = new String[i + j];
            for (int k = 0; k < i; k++) {
                messages[k] = messages1[k];
            }

            for (int k = 0; k < j; k++) {
                messages[i + k] = messages2[k];
            }

            for (int k = 0; k < messages.length; k++) {
                for (int l = k + 1; l < messages.length; l++) {
                    int firstWhiteSpace = messages[k].indexOf(" ");
                    int secondWhiteSpace = messages[k].indexOf(" ", firstWhiteSpace + 1);
                    int thirdWhiteSpace = messages[k].indexOf(" ", secondWhiteSpace + 1);
                    DateTime first = new DateTime(messages[k].substring(firstWhiteSpace + 1, thirdWhiteSpace));

                    int firstWhiteSpace2 = messages[l].indexOf(" ");
                    int secondWhiteSpace2 = messages[l].indexOf(" ", firstWhiteSpace2 + 1);
                    int thirdWhiteSpace2 = messages[l].indexOf(" ", secondWhiteSpace2 + 1);
                    DateTime second = new DateTime(messages[l].substring(firstWhiteSpace2 + 1, thirdWhiteSpace2));

public static void readMessages() {
        try {
            Scanner reader1 = new Scanner(new File("Person1.txt"));
            Scanner reader2 = new Scanner(new File("Person2.txt"));
            String[] messages1 = new String[10];
            String[] messages2 = new String[10];
            int i = 0;
            int j = 0;
            
            while (reader1.hasNextLine()) {
                messages1[i] = reader1.nextLine();
                i++;
            }

            while (reader2.hasNextLine()) {
                messages2[j] = reader2.nextLine();
                j++;
            }

            reader1.close();
            reader2.close();

            messages = new String[i + j];
            for (int k = 0; k < i; k++) {
                messages[k] = messages1[k];
            }

            for (int k = 0; k < j; k++) {
                messages[i + k] = messages2[k];
            }

            for (int k = 0; k < messages.length; k++) {
                for (int l = k + 1; l < messages.length; l++) {
                    int firstWhiteSpace = messages[k].indexOf(" ");
                    int secondWhiteSpace = messages[k].indexOf(" ", firstWhiteSpace + 1);
                    int thirdWhiteSpace = messages[k].indexOf(" ", secondWhiteSpace + 1);
                    DateTime first = new DateTime(messages[k].substring(firstWhiteSpace + 1, thirdWhiteSpace));

                    int firstWhiteSpace2 = messages[l].indexOf(" ");
                    int secondWhiteSpace2 = messages[l].indexOf(" ", firstWhiteSpace2 + 1);
                    int thirdWhiteSpace2 = messages[l].indexOf(" ", secondWhiteSpace2 + 1);
                    DateTime second = new DateTime(messages[l].substring(firstWhiteSpace2 + 1, thirdWhiteSpace2));

                    if (first.compareTo(second) > 0) {
                        String temp = messages[k];
                        messages[k] = messages[l];
                        messages[l] = temp;
                    }
                }
            }
        } catch (FileNotFoundException e) {
            System.out.println("File not found.");
        }

                    if (first.compareTo(second) > 0) {
                        String temp = messages[k];
                        messages[k] = messages[l];
                        messages[l] = temp;
                    }
                }
            }
        } catch (FileNotFoundException e) {
            System.out.println("File not found.");
        }

public static void writeConversation() {
        try {
            PrintWriter writer = new PrintWriter("Conversation.txt");
            for (String message : messages) {
                writer.println(message);
            }
            writer.close();
        } catch (FileNotFoundException e) {
            System.out.println("File not found.");
        }
    }

public static void writeConversation() {
        try {
            PrintWriter writer = new PrintWriter("Conversation.txt");
            for (String message : messages) {
                writer.println(message);
            }
            writer.close();
        } catch (FileNotFoundException e) {
            System.out.println("File not found.");
        }
    }

and i am aware that here's probably more optimized ways i can write the code but i'm very new to java so i'm not that good

dan1st•4w ago

Can you try compiling that with from the command-line? Did you actually save the file?

akumaOP•4w ago

yes, it is running smoothly on my own computer, but when codegrade runs it, it gives me the error i got above not sure how to do that, sorry

dan1st•4w ago

I guess the specification requires the method to look like that? Did you maybe get a project template or similar?

akumaOP•4w ago

we only got basic instructions on which classes to create, what each class is supposed to have and one by one i fixed all the errors that popped up in codegrade then i landed on that one if you want, i can also send a screenshot of the instructions given to us

dan1st•4w ago

Well I guess these instructions said what the methods should look like

akumaOP•4w ago

yeah and apparently the readMessages method is supposed to have no arguments in the end i just submitted as it is since i racked my brain the whole day and couldn't figure out the issue

JavaBot•3w ago

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Error related to arguments in a method

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