Tried creating a thread, having some difficulty

src/main/java/com/application/GUI/InputPopUpWindow.java

@@ -2,12 +2,17 @@ package com.application.GUI;
 
 import javafx.geometry.Pos;
 import javafx.scene.*;
-import javafx.scene.chart.LineChart;
 import javafx.scene.control.*;
 import javafx.scene.layout.*;
 import javafx.stage.*;
+import org.checkerframework.checker.units.qual.K;
+
+import java.util.Map;
 
 import static com.application.DB.Constants.*;
+import static com.application.DB.DB.setInputParameters;
+import static com.application.GUI.LineChartFunctionality.loadSingleSeries;
+
 
 /**
  * This class handles the popup input window
@@ -79,15 +84,77 @@ public class InputPopUpWindow {
 
             window.close();
 
-            // Call på getKwh()
+
+            class KwhThread implements Runnable {
+
+                Map<Integer, Map<String, Number>> dataVariable;
+                private volatile boolean finished;
+
+                @Override
+                public void run() {
+                    try{
+                        dataVariable = setInputParameters();
+                    } catch (Exception ex) {
+                        ex.printStackTrace();
+                    }
+                    finished = true;
+
+                    synchronized (this){
+                        this.notify();
+                    }
+                }
+
+
+
+                public Map<Integer, Map<String, Number>> getDataVariable() throws InterruptedException {
+
+                    synchronized (this){
+                        if(!finished)
+                        this.wait();
+                    }
+                    return dataVariable;
+                }
+            }
+
+            KwhThread kwhThread = new KwhThread();
+
+            Thread thread = new Thread(kwhThread);
+            thread.setName("GetKwhThread");
+            thread.start();
+
             try {
-                LineChartFunctionality.loadSingleSeries();
-                //LineChartFunctionality.loadMultipleSeries();
+                loadSingleSeries(kwhThread.getDataVariable());
+            } catch (Exception ex) {
+                ex.printStackTrace();
+            }
+
+
+
+
+
+            /*
+            // Fungerende ny thread!!@@@@@
+            try{
+                Thread thread = new Thread(new Runnable() {
 
+                    @Override
+                    public void run() {
+                        try {
+                            loadSingleSeries(setInputParameters());
+                            //loadSingleSeries();
+                            //loadMultipleSeries();
+                        } catch (Exception ex) {
+                            ex.printStackTrace();
+                        }
+                    }
+                });
+                thread.start();
+                //thread.join();
             } catch (Exception ex) {
                 ex.printStackTrace();
             }
 
+             */
         });
 
         VBox layout = new VBox(10);

src/main/java/com/application/GUI/LineChartFunctionality.java

@@ -26,7 +26,11 @@ public class LineChartFunctionality {
         lineChart.setTitle("Drying Processes");
     }
 
-    public LineChart<String, Number> getLineChart() {
+    public static void setLineChart(LineChart<String, Number> lineChart) {
+        LineChartFunctionality.lineChart = lineChart;
+    }
+
+    public static LineChart<String, Number> getLineChart() {
         return lineChart;
     }
 
@@ -39,13 +43,14 @@ public class LineChartFunctionality {
     }
 
 
-    public static void loadSingleSeries() throws Exception {
+    public static LineChart<String, Number> loadSingleSeries(Map<Integer, Map<String, Number>> userInput) throws Exception {
         clearLineChart();
 
-        Map<Integer, Map<String, Number>> kWh = DB.setInputParameters();
+        //Map<Integer, Map<String, Number>> kWh = userInput;
+        //Map<Integer, Map<String, Number>> kWh = DB.setInputParameters();
         //System.out.println(kWh.size());
 
-        for (Map.Entry<Integer, Map<String, Number>> entryKwh : kWh.entrySet()) {
+        for (Map.Entry<Integer, Map<String, Number>> entryKwh : userInput.entrySet()) {
             Map data = entryKwh.getValue();
             //System.out.println(data.size());
 
@@ -67,6 +72,7 @@ public class LineChartFunctionality {
             }
             updateLineChart(newSeries);
         }
+        return getLineChart();
     }
 
     public static void loadMultipleSeries() throws Exception {

target/classes/com.application/CSS/styleSheet.css

@@ -104,6 +104,7 @@
 
 #inputButtonStart {
     -fx-pref-width: infinity;
+    -fx-translate-y: 10;
     -fx-pref-height: 25;
     -fx-font-size: 20;
     -fx-font-family: Arial;