Thread: Code and Structure Help

really had problem posting my first post due to forum regulations.
so I will continue here :

problem
Find a way to open again the graph without having " Application launch must not be called more than once" problem

this is my code in the action listener. I know that I can use the Application.launch only one time. is there any other way to do it?

import java.io.FileReader;
import com.opencsv.CSVReader;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.Scene;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.ScatterChart;
import javafx.scene.chart.XYChart;
import javafx.stage.Stage;
 
public class TempGraph extends Application {
 
    @Override
    public void start(Stage TempStage) throws Exception {
        //Platform.setImplicitExit(false);
        TempStage.setTitle("Index Chart Sample");
        final NumberAxis yAxis = new NumberAxis(0, 80, 1);
        final CategoryAxis xAxis = new CategoryAxis();
 
        final LineChart<String, Number> lineChart = new LineChart<>(xAxis, yAxis);
        yAxis.setLabel("Temperature");
        xAxis.setLabel("Altitude");
        lineChart.setTitle("Sensor Graph");
 
        XYChart.Series temp = new XYChart.Series();
 
        temp.setName("Temperature");
 
        try (CSVReader dataReader = new CSVReader(new FileReader("test1.csv"))) {
            String[] nextLine;
            while ((nextLine = dataReader.readNext()) != null) {
                String alt = String.valueOf(nextLine[0]);
                int temperature = Integer.parseInt(nextLine[1]);
                temp.getData().add(new XYChart.Data(alt, temperature));
            }
        }
 
        lineChart.getData().addAll(temp);
        Scene scene = new Scene(lineChart, 500, 400);
        TempStage.setScene(scene);
        TempStage.show();
    }
 
    }

--- Update ---

import com.opencsv.CSVReader;
import java.io.IOException;
import java.io.Reader;
import java.nio.file.Files;
import java.nio.file.Paths;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.embed.swing.JFXPanel;
import javafx.scene.Scene;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.ScatterChart;
import javafx.scene.chart.XYChart;
import javafx.stage.Stage;
 
 
public class OpenCSVReader {
 
private static final String SAMPLE_CSV_FILE_PATH = "./test.csv";
 
    public static void main(String[] args) throws IOException, ClassNotFoundException, UnsupportedLookAndFeelException, InstantiationException, IllegalAccessException {
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        SwingUtilities.invokeLater(new Runnable() {
 
            @Override
 
            public void run() {
                MainWeather mainWeather = new MainWeather();
                mainWeather.setVisible(true);
                mainWeather.setDefaultCloseOperation(EXIT_ON_CLOSE);
 
            }
        });
 
        try (
                Reader reader = Files.newBufferedReader(Paths.get(SAMPLE_CSV_FILE_PATH));
                CSVReader csvReader = new CSVReader(reader);
        ) {
            // Reading Records One by One in a String array
            String[] nextRecord;
            while ((nextRecord = csvReader.readNext()) != null) {
                System.out.println("Alt : " + nextRecord[0]);
                System.out.println("Temp : " + nextRecord[1]);
                System.out.println("Hyd : " + nextRecord[2]);
                System.out.println("Hpa : " + nextRecord[3]);
                System.out.println("==========================");
            }
        }
    }
}

--- Update ---

import javafx.application.Application;
import javafx.embed.swing.JFXPanel;
import javafx.stage.Stage;
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
public class MainWeather extends JFrame {
 
 
    private JButton TempButton;
    private JButton HumidButton;
    private JPanel MainPanel;
 
    public MainWeather ()
    {
 
        add(MainPanel);
        setTitle("Drone Weather Station");
        setSize(500,500);
        TempButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                TempGraph tempGraph = new TempGraph();
                Application.launch(TempGraph.class);
            }
        });
        HumidButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                Application.launch(HumGraph.class);
            }
        });
    }
}

Can you copy and post the full contents of the error message stack trace?

Also please post the import statements for the code so it can be compiled and executed for testing.

Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: Application launch must not be called more than once
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchAppl ication(LauncherImpl.java:178)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchAppl ication(LauncherImpl.java:159)
at javafx.graphics/javafx.application.Application.launch(Application. java:227)
at MainWeather$1.actionPerformed(MainWeather.java:23)

The JVM thinks that the call to launch at line 23 is not the first time the launch method was called. Has the code called launch before?
I guess the code can only call launch one time. (I don't know JavaFX and am guessing from the error message).
The API doc says: This method is typically called from the main method(). It must not be called more than once or an exception will be thrown.

From that error message it seems that the code should only call the launch method one time so the code needs to be changed so it only calls launch one time.

Moved to JavaFX section

Try asking the question here: https://coderanch.com/f/98/JavaFX
I think there are people there that know JavaFX