Add chapters 9-17 for the java book

Java-Kompendium/kap14/1/src/main/java/EnterHandler.java

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+import java.io.*;
+
+import javafx.event.ActionEvent;
+import javafx.event.EventHandler;
+import javafx.scene.control.Alert;
+import javafx.scene.control.TextField;
+import javafx.scene.control.Alert.AlertType;
+
+public final class EnterHandler implements EventHandler<ActionEvent> {
+    private BufferedWriter outputStream;
+    private TextField inputField;
+
+    public EnterHandler(TextField input, BufferedWriter output) {
+        this.outputStream = output;
+        this.inputField = input;
+    }
+
+    public void handle(ActionEvent event) {
+        Alert alert;
+        try {
+            this.outputStream.write(inputField.getText() + "\n");
+        } catch (IOException exception) {
+            alert = new Alert(AlertType.ERROR, exception.getMessage());
+            alert.showAndWait();
+            return;
+        }
+        alert = new Alert(AlertType.INFORMATION, "Gespeichert");
+        alert.showAndWait();
+        inputField.setText("");
+    }
+}

Java-Kompendium/kap14/1/src/main/java/Task1.java

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+import java.io.*;
+
+import javafx.scene.Scene;
+import javafx.scene.control.TextField;
+import javafx.scene.layout.StackPane;
+import javafx.application.Application;
+import javafx.stage.Stage;
+import javafx.scene.control.Alert;
+import javafx.scene.control.Alert.AlertType;
+
+public class Task1 extends Application {
+    BufferedWriter output = null;
+
+    @Override
+    public void start(Stage stage) {
+        var userInput = new TextField();
+        var root = new StackPane(userInput);
+        var scene = new Scene(root, 400, 300);
+
+        stage.setTitle("Geben Sie Ihre Notiz ein:");
+        stage.setScene(scene);
+
+        try {
+            this.output = new BufferedWriter(new FileWriter("Notizen.txt", true));
+
+            userInput.setOnAction(new EnterHandler(userInput, output));
+        } catch (IOException exception) {
+            var alert = new Alert(AlertType.ERROR, exception.getMessage());
+            alert.showAndWait();
+        }
+        stage.show();
+    }
+
+    @Override
+    public void stop() throws IOException {
+        if (this.output != null) {
+            output.close();
+        }
+    }
+}