init

src/sample/Controller.java

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+package sample;
+
+import javafx.application.Platform;
+import javafx.event.ActionEvent;
+import javafx.scene.control.Button;
+import javafx.scene.control.Label;
+import javafx.scene.control.TextField;
+
+import java.text.DecimalFormat;
+import java.util.Date;
+
+public class Controller {
+    public Button btnstart;
+    public Button btnpause;
+    public Button btnstop;
+    public Label timelabel;
+    public Button btnresume;
+    public TextField textinput;
+    public TextField entimefield;
+
+    private long starttime = new Date().getTime();
+    private long endtime;
+    private long warningtime;
+
+    private Thread curr = null;
+    private long pausetime = new Date().getTime();
+    private DecimalFormat format = new DecimalFormat("00");
+
+    private final Runnable timer = new Runnable() {
+        @Override
+        public void run() {
+            while (true) {
+                long currtime = new Date().getTime() - starttime;
+
+                int sec = (int) currtime / 1000;
+                int min = (int) currtime / (1000 * 60);
+                int ms = (int) currtime - (sec * 1000 + min * (1000 * 60));
+                Platform.runLater(() -> timelabel.setText(format.format(min) + ":" + format.format(sec) + ":" + format.format((int) ((float) ms / 10) + 0.5)));
+
+                if (warningtime < currtime) {
+                    timelabel.setStyle("-fx-background-color: #FF0000");
+                }
+
+                if (endtime < currtime) {
+                    btnstart.setDisable(false);
+                    btnstop.setDisable(true);
+
+                    curr.stop();
+                }
+
+
+                try {
+                    Thread.sleep(10);
+                } catch (InterruptedException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+    };
+
+    public Controller() {
+        Platform.runLater(() -> {
+            btnstop.setDisable(true);
+            btnpause.setDisable(true);
+            btnresume.setDisable(true);
+        });
+    }
+
+    public void startclick(ActionEvent actionEvent) {
+        btnstart.setDisable(true);
+        btnpause.setDisable(false);
+        btnstop.setDisable(false);
+
+        starttime = new Date().getTime();
+
+        // parse warning field
+        String inp = textinput.getText();
+        int mins = Integer.parseInt(inp.substring(0, 2));
+        int secs = Integer.parseInt(inp.substring(3, 5));
+        int mss = Integer.parseInt(inp.substring(6, 8));
+        warningtime = mss + secs * 1000 + mins * 60 * 1000;
+
+        // parse end field
+        String inpe = entimefield.getText();
+        int mine = Integer.parseInt(inpe.substring(0, 2));
+        int sece = Integer.parseInt(inpe.substring(3, 5));
+        int mse = Integer.parseInt(inpe.substring(6, 8));
+        endtime = mse + sece * 1000 + mine * 60 * 1000;
+
+        timelabel.setStyle("-fx-background-color: #ebebeb");
+
+        curr = new Thread(timer);
+        curr.start();
+    }
+
+    public void pauseclick(ActionEvent actionEvent) {
+        btnpause.setDisable(true);
+        btnresume.setDisable(false);
+
+        pausetime = new Date().getTime();
+        curr.stop();
+    }
+
+    public void stopclick(ActionEvent actionEvent) {
+        btnstart.setDisable(false);
+        btnstop.setDisable(true);
+        btnpause.setDisable(true);
+        btnresume.setDisable(true);
+
+        curr.stop();
+    }
+
+    public void resumeclick(ActionEvent actionEvent) {
+        btnresume.setDisable(true);
+        btnpause.setDisable(false);
+
+        starttime += (new Date().getTime() - pausetime);
+
+        curr = new Thread(timer);
+        curr.start();
+    }
+}

src/sample/Main.java

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+package sample;
+
+import javafx.application.Application;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Parent;
+import javafx.scene.Scene;
+import javafx.stage.Stage;
+
+public class Main extends Application {
+
+    @Override
+    public void start(Stage primaryStage) throws Exception{
+        Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
+        primaryStage.setTitle("Stoppuhr");
+        primaryStage.setResizable(false);
+        primaryStage.setScene(new Scene(root, 300, 500));
+        primaryStage.show();
+    }
+
+
+    public static void main(String[] args) {
+        launch(args);
+    }
+}

src/sample/sample.fxml

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import javafx.scene.control.*?>
+<?import javafx.scene.layout.*?>
+<?import javafx.scene.text.*?>
+
+<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="313.0" xmlns="http://javafx.com/javafx/10.0.2-internal" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
+   <children>
+      <Button fx:id="btnstart" layoutX="31.0" layoutY="34.0" mnemonicParsing="false" onAction="#startclick" text="Start" />
+      <Button fx:id="btnpause" layoutX="90.0" layoutY="34.0" mnemonicParsing="false" onAction="#pauseclick" text="Pause" />
+      <Button fx:id="btnstop" layoutX="240.0" layoutY="34.0" mnemonicParsing="false" onAction="#stopclick" text="Stop" />
+      <Label fx:id="timelabel" layoutX="31.0" layoutY="95.0" text="00:00:00">
+         <font>
+            <Font size="52.0" />
+         </font></Label>
+      <Button fx:id="btnresume" layoutX="157.0" layoutY="34.0" mnemonicParsing="false" onAction="#resumeclick" text="Resume" />
+      <TextField fx:id="textinput" layoutX="62.0" layoutY="200.0" text="02:50:89" />
+      <TextField fx:id="entimefield" layoutX="63.0" layoutY="280.0" text="05:00:00" />
+      <Label layoutX="63.0" layoutY="176.0" text="Warningtime" />
+      <Label layoutX="63.0" layoutY="257.0" text="Endtime" />
+   </children>
+</AnchorPane>