Slides for onsdag uke 10, to JavaFX-eksempler på obervatør-pattern.

foreksempel/src/main/java/uke10/observerfx/Hello.java

+package uke10.observerfx;
+
+
+import javafx.application.Application;
+import javafx.scene.Scene;
+import javafx.scene.control.Button;
+import javafx.scene.layout.StackPane;
+import javafx.stage.Stage;
+
+public class Hello extends Application {
+    public static void main(String[] args) {
+        launch(args);
+    }
+
+    @Override
+    public void start(Stage primaryStage) {
+        primaryStage.setTitle("Hello");
+        Button btn = new Button();
+        btn.setText("Say 'Hello'");
+        btn.setOnAction(event -> System.out.println("Hello"));
+
+        // Med anonym klasse hadde dette blitt:
+        // btn.setOnAction(new EventHandler<ActionEvent> () {
+        //     @Override
+        //     public void handle(ActionEvent event) {
+        //         System.out.println("Hello!");
+        //     }
+        // });
+
+        StackPane root = new StackPane();
+        root.getChildren().add(btn);
+        primaryStage.setScene(new Scene(root, 300, 250));
+        
+        primaryStage.show();
+    }
+
+
+}
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foreksempel/src/main/java/uke10/observerfx/Main.java

+package uke10.observerfx;
+
+import javafx.application.Application;
+import javafx.beans.value.ChangeListener;
+import javafx.beans.value.ObservableValue;
+import javafx.scene.Scene;
+import javafx.scene.control.Label;
+import javafx.scene.control.TextField;
+import javafx.scene.layout.VBox;
+import javafx.stage.Stage;
+
+public class Main extends Application {
+    @Override
+    public void start(Stage primaryStage) {
+        TextField textField = new TextField();
+        Label label = new Label();
+
+        // Add a listener to the TextField's text property
+        textField.textProperty().addListener(new ChangeListener<String>() {
+            @Override
+            public void changed(ObservableValue<? extends String> observable, String oldValue, String newValue) {
+                System.out.println(observable);  // for å logge kallet og hva observable-objektet inneholder
+                label.setText(newValue);
+            }
+        });
+
+        VBox vbox = new VBox(textField, label);
+        Scene scene = new Scene(vbox, 200, 100);
+
+        primaryStage.setScene(scene);
+        primaryStage.show();
+    }
+
+    public static void main(String[] args) {
+        launch(args);
+    }
+}
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