Separated into model and application & receiveValues() & Array

src/application/Graph.java

@@ -1,16 +0,0 @@
-package application;
-
-import java.util.ArrayList;
-
-public class Graph {
-	private ArrayList<ArrayList<Graph>> values;
-	
-	public Graph() {
-		values = new ArrayList<ArrayList<Graph>>();
-	}
-	
-	public boolean receiveValues() {
-		return true;
-	}
-	
-}

src/model/FileChooserExample.java

@@ -1,4 +1,4 @@
-package application;
+package model;
 	
 import java.io.File;
 

src/model/Graph.java

@@ -0,0 +1,37 @@
+package model;
+
+import java.io.BufferedReader;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+
+public class Graph {
+	private ArrayList<Graph> values;
+	
+	public Graph() {
+		values = new ArrayList<Graph>();
+	}
+	
+	public boolean receiveValues() throws GraphException {
+		try (BufferedReader br = new BufferedReader(new FileReader(""))) { // filePath von application.RootBorderPane.importCSV()
+			String zeile;
+			String[] zeilenTeile;
+			String sep = ";"; // erwartetes Trennzeichen in der csv-Datei
+
+			
+			zeile = br.readLine(); // wenn keine Zeile gefunden, dann return null
+
+			while (zeile != null) {
+				zeilenTeile = zeile.trim().split(sep);
+			}
+			
+		} catch (FileNotFoundException e) {
+			throw new GraphException("Datei-Fehler bei receiveValues(): " + e.getMessage());
+		} catch (IOException e) {
+			throw new GraphException("Datei-Fehler bei receiveValues(): " + e.getMessage());
+		}
+		return false;
+	}
+	
+}

src/model/GraphException.java

@@ -0,0 +1,11 @@
+package model;
+
+public class GraphException extends Exception{
+	
+	private static final long serialVersionUID = 2022_05_31__12_16L;
+
+	public GraphException(String message) {
+		super(message);
+	}
+	
+}