asdru Posts - Answer Overflow

asdru

•Created by asdru on 9/19/2024 in #java-help

scanner blocking thread close

in a project im working on i have a client with a sender and receiver thread. When the server send the quit command im also sending the clients the "quit" message which should intterupt their sender and receiver threads. The receiver ends just fine but the sender (that has the scanner) is stuck waiting for the next line. What's the appropriate way to handle this? i tried closing the senders' scanner in the receiver among other things but nothing worked

24 replies

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•Created by asdru on 9/16/2024 in #java-help

keeping track of clients connected to server

i have a server class that implements the runnable method, and i want to keep track of the clients connected to it so i can disconnect all of them via server class method. I've seen that a common practise is to use clientHandlers that are Runnable so that each client can run concurrently with the others, but i still dont get how to store the connected client object to the server (if its even possible)

5 replies

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•Created by asdru on 8/9/2024 in #java-help

convert n-tree to dictionary based on depth

public Map<Integer, List<Integer>> toDict() {
          
            Map<Integer, List<Integer>> dict = new HashMap<>();
            Queue<Node> queue = new LinkedList<>();
            queue.add(root);
            int depth = 0;

            while (!queue.isEmpty()) {
                int levelSize = queue.size();
                List<Integer> currentLevel = new ArrayList<>();

                for (int i = 0; i < levelSize; i++) {
                    Node node = queue.poll();
                    currentLevel.add(node.getValue());

                    // Add all children of the current node to the queue
                    for (Node child : node.children) {
                        queue.add(child);
                    }
                }
                dict.put(depth, currentLevel);
                depth++;
            }
            return dict;
        }

public Map<Integer, List<Integer>> toDict() {
          
            Map<Integer, List<Integer>> dict = new HashMap<>();
            Queue<Node> queue = new LinkedList<>();
            queue.add(root);
            int depth = 0;

            while (!queue.isEmpty()) {
                int levelSize = queue.size();
                List<Integer> currentLevel = new ArrayList<>();

                for (int i = 0; i < levelSize; i++) {
                    Node node = queue.poll();
                    currentLevel.add(node.getValue());

                    // Add all children of the current node to the queue
                    for (Node child : node.children) {
                        queue.add(child);
                    }
                }
                dict.put(depth, currentLevel);
                depth++;
            }
            return dict;
        }

I wrote this function to convert a tree into a dictionary where the depth is mapped to the nodes on that depth (i.e. 0->root) is there a better way to do this?

5 replies

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•Created by asdru on 8/7/2024 in #java-help

isometric tile setup

26 replies

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•Created by asdru on 5/4/2024 in #java-help

Filling array with same object reference

playerParty[0] = new PlayerParty(new Vector2D(screenCenter.x-100,screenCenter.y),
                new PlayableEntity[]{
                        PlayableEntity.getCharacter(PlayableEntity.Characters.PLAYER,this),
                        PlayableEntity.getCharacter(PlayableEntity.Characters.PLAYER,this),
                        PlayableEntity.getCharacter(PlayableEntity.Characters.PLAYER,this),
                        PlayableEntity.getCharacter(PlayableEntity.Characters.PLAYER,this)
        });

playerParty[0] = new PlayerParty(new Vector2D(screenCenter.x-100,screenCenter.y),
                new PlayableEntity[]{
                        PlayableEntity.getCharacter(PlayableEntity.Characters.PLAYER,this),
                        PlayableEntity.getCharacter(PlayableEntity.Characters.PLAYER,this),
                        PlayableEntity.getCharacter(PlayableEntity.Characters.PLAYER,this),
                        PlayableEntity.getCharacter(PlayableEntity.Characters.PLAYER,this)
        });

get characters returns this return new PlayableEntity(gamePanel, "player",new Stats(100,20)); i thought this would make the playable entities inside of the array different intances of the same object, but for some reason all the changes i make the one playable entities in the array are applied to all other playable entities

29 replies

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•Created by asdru on 5/3/2024 in #java-help

Build jar from maven project on github

35 replies

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•Created by asdru on 3/19/2024 in #java-help

cant build javafx project

Java FX Packager: Can't build artifact - fx:deploy is not available in this JDK this is the error i get but i dont understand what fx:deploy is

26 replies

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•Created by asdru on 3/15/2024 in #java-help

Gson cannot be resolved to a type error randomly started appearing

public static Partita carica(int id) {
        Gson gson = new Gson();
        return gson.fromJson(Utili.leggiFileJson("partite", Integer.toString(id)), Partita.class);
    }

public static Partita carica(int id) {
        Gson gson = new Gson();
        return gson.fromJson(Utili.leggiFileJson("partite", Integer.toString(id)), Partita.class);
    }

i have this method that loads a json file into a class, which i dont exactly know it started throwing an error at this line Gson gson = new Gson(); despite me not touching that function or the Util function. The wierd part is that if i rewrite that function in a runnable class like

public static void main(String[] args) {
                Gson gson = new Gson();
                Partita p = gson.fromJson(Utili.leggiFileJson("partite", Integer.toString(25066)), Partita.class);
        }

public static void main(String[] args) {
                Gson gson = new Gson();
                Partita p = gson.fromJson(Utili.leggiFileJson("partite", Integer.toString(25066)), Partita.class);
        }

it works. so i can say its not an issue with imports or my util function

6 replies

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•Created by asdru on 2/29/2024 in #java-help

modules randomly stopped working on intelliJ

8 replies

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•Created by asdru on 2/16/2024 in #java-help

return string that gets put in the text in a scene builder text label

4 replies

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•Created by asdru on 2/7/2024 in #java-help

javafx fxml file not found

package gioco.progettospacca.controller;

import gioco.progettospacca.classi.Partita;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Node;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.stage.Stage;

import java.io.IOException;

public class HomeController {
    @FXML
    public void giocaPartita(ActionEvent actionEvent) {

    }

    public void EventoCreaPartita(ActionEvent actionEvent) throws IOException{
        Parent root = FXMLLoader.load(getClass().getResource("LoginAdminView.fxml"));
        Scene scene=new Scene(root);
        Stage stage = (Stage)((Node)actionEvent.getSource()).getScene().getWindow();
        stage.setTitle("Login amministratore");
        stage.setScene(scene);
        stage.show();

    }

    public void giocaTorneo(ActionEvent actionEvent) {
    }

    public void creaTorneo(ActionEvent actionEvent) {
    }
}

package gioco.progettospacca.controller;

import gioco.progettospacca.classi.Partita;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Node;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.stage.Stage;

import java.io.IOException;

public class HomeController {
    @FXML
    public void giocaPartita(ActionEvent actionEvent) {

    }

    public void EventoCreaPartita(ActionEvent actionEvent) throws IOException{
        Parent root = FXMLLoader.load(getClass().getResource("LoginAdminView.fxml"));
        Scene scene=new Scene(root);
        Stage stage = (Stage)((Node)actionEvent.getSource()).getScene().getWindow();
        stage.setTitle("Login amministratore");
        stage.setScene(scene);
        stage.show();

    }

    public void giocaTorneo(ActionEvent actionEvent) {
    }

    public void creaTorneo(ActionEvent actionEvent) {
    }
}

i get an error saying that getClass().getResource("LoginAdminView.fxml") at line 22 is null i dont understand why since i have the same setup in the main class and that works. the only difference is that this class is in a subfolder and the main isnt. But i can't figure out what's wrong

28 replies

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•Created by asdru on 5/22/2023 in #java-help

java.lang.ClassNotFoundException

I started getting this error regardless of what file i compiled, after a bit of research i managed to narrow down the issue to something wrong with my classpath in sistem variables, but hadn't had any luck fixing it

19 replies

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