32 ex 2 add javadoc description

HarryDulaney · Nov 18, 2023 · c9d8f95 · c9d8f95
1 parent 9b42e03
commit c9d8f95
Showing 1 changed file with 122 additions and 114 deletions.
diff --git a/ch_32/Exercise32_02.java b/ch_32/Exercise32_02.java
@@ -11,124 +11,132 @@
 import javafx.scene.shape.Rectangle;
 import javafx.stage.Stage;
 
+/**
+ * **32.2 (Visualize data) Write a program that displays the number of students in each
+ * department in a pie chart and a bar chart, as shown in Figure 32.27b. The number
+ * of students for each department can be obtained from the Student table (see
+ * Figure 32.4) using the following SQL statement:
+ * select deptId, count(*)
+ * from Student
+ * where deptId is not null
+ * group by deptId;
+ */
 public class Exercise32_02 extends Application {
-  @Override
-  public void start(Stage primaryStage) {       
-    CarPane car = new CarPane();
-
-    Scene scene = new Scene(car, 200, 200);
-    primaryStage.setTitle(getClass().getName());
-    primaryStage.setScene(scene);
-    primaryStage.show();
-
-    scene.widthProperty().addListener(e -> car.setW(car.getWidth()));
-    scene.heightProperty().addListener(e -> car.setH(car.getHeight()));
-
-    car.setOnMousePressed(e -> car.suspend());
-    car.setOnMouseReleased(e -> car.resume());
-
-    car.requestFocus();
-    car.setOnKeyPressed(e -> {
-      if (e.getCode() == KeyCode.UP) {
-        car.faster();
-      }
-      else if (e.getCode() == KeyCode.DOWN) {
-        car.slower();
-      }
-    });
-  }
+    @Override
+    public void start(Stage primaryStage) {
+        CarPane car = new CarPane();
+
+        Scene scene = new Scene(car, 200, 200);
+        primaryStage.setTitle(getClass().getName());
+        primaryStage.setScene(scene);
+        primaryStage.show();
+
+        scene.widthProperty().addListener(e -> car.setW(car.getWidth()));
+        scene.heightProperty().addListener(e -> car.setH(car.getHeight()));
+
+        car.setOnMousePressed(e -> car.suspend());
+        car.setOnMouseReleased(e -> car.resume());
 
-  /**
-   * The main method is only needed for the IDE with limited
-   * JavaFX support. Not needed for running from the command line.
-   */
-  public static void main(String[] args) {
-    launch(args);
-  }
-} 
+        car.requestFocus();
+        car.setOnKeyPressed(e -> {
+            if (e.getCode() == KeyCode.UP) {
+                car.faster();
+            } else if (e.getCode() == KeyCode.DOWN) {
+                car.slower();
+            }
+        });
+    }
+
+    /**
+     * The main method is only needed for the IDE with limited
+     * JavaFX support. Not needed for running from the command line.
+     */
+    public static void main(String[] args) {
+        launch(args);
+    }
+}
 
 class CarPane extends Pane {
-  private double w = 200;
-  private double h = 200;
-  private double baseX = 0;
-  private double baseY = h;
-  private Circle c1 = new Circle(baseX + 10 + 5, baseY - 10 + 5, 5);
-  private Circle c2 = new Circle(baseX + 30 + 5, baseY - 10 + 5, 5);
-
-  private Rectangle carBody = new Rectangle(baseX, baseY - 20, 50, 10);
-  private Polygon carTop = new Polygon(baseX + 10, baseY - 20, 
-            baseX + 20, baseY - 30, baseX + 30, baseY - 30, 
-            baseX + 40, baseY - 20);   
-  private int sleepTime = 50;
-
-  private Thread thread = new Thread(() -> {
-    try {
-      while (true) {
-        Platform.runLater(() -> move());
-        Thread.sleep(sleepTime);
-      }
+    private double w = 200;
+    private double h = 200;
+    private double baseX = 0;
+    private double baseY = h;
+    private Circle c1 = new Circle(baseX + 10 + 5, baseY - 10 + 5, 5);
+    private Circle c2 = new Circle(baseX + 30 + 5, baseY - 10 + 5, 5);
+
+    private Rectangle carBody = new Rectangle(baseX, baseY - 20, 50, 10);
+    private Polygon carTop = new Polygon(baseX + 10, baseY - 20,
+            baseX + 20, baseY - 30, baseX + 30, baseY - 30,
+            baseX + 40, baseY - 20);
+    private int sleepTime = 50;
+
+    private Thread thread = new Thread(() -> {
+        try {
+            while (true) {
+                Platform.runLater(() -> move());
+                Thread.sleep(sleepTime);
+            }
+        } catch (InterruptedException ex) {
+        }
+    });
+
+    public CarPane() {
+        carBody.setFill(Color.GREEN);
+        carTop.setFill(Color.RED);
+        this.getChildren().addAll(c1, c2, carBody, carTop);
+
+        thread.start();
+    }
+
+    public void suspend() {
+        thread.suspend();
     }
-    catch (InterruptedException ex) {
+
+    public void resume() {
+        thread.resume();
+    }
+
+    public void faster() {
+        if (sleepTime > 1)
+            sleepTime--;
+    }
+
+    public void slower() {
+        sleepTime++;
+    }
+
+    public void move() {
+        if (baseX > w)
+            baseX = -20;
+        else
+            baseX += 1;
+
+        setValues();
+    }
+
+    public void setValues() {
+        c1.setCenterX(baseX + 10 + 5);
+        c1.setCenterY(baseY - 10 + 5);
+        c2.setCenterX(baseX + 30 + 5);
+        c2.setCenterY(baseY - 10 + 5);
+
+        carBody.setX(baseX);
+        carBody.setY(baseY - 20);
+
+        carTop.getPoints().clear();
+        carTop.getPoints().addAll(baseX + 10, baseY - 20,
+                baseX + 20, baseY - 30, baseX + 30, baseY - 30,
+                baseX + 40, baseY - 20);
+    }
+
+    public void setW(double w) {
+        this.w = w;
+        setValues();
+    }
+
+    public void setH(double h) {
+        this.h = h;
+        baseY = h;
+        setValues();
     }
-  });
-
-  public CarPane() {
-    carBody.setFill(Color.GREEN);
-    carTop.setFill(Color.RED);
-    this.getChildren().addAll(c1, c2, carBody, carTop);
-
-    thread.start();
-  }
-
-  public void suspend() {
-    thread.suspend();
-  }
-
-  public void resume() {
-    thread.resume();
-  }
-
-  public void faster() {
-    if (sleepTime > 1)
-      sleepTime--;
-  }
-
-  public void slower() {
-    sleepTime++;
-  }
-
-  public void move() {
-    if (baseX > w)
-      baseX = -20;
-    else
-      baseX += 1;
-
-    setValues();
-  }
-
-  public void setValues() {
-    c1.setCenterX(baseX + 10 + 5);
-    c1.setCenterY(baseY - 10 + 5);
-    c2.setCenterX(baseX + 30 + 5);
-    c2.setCenterY(baseY - 10 + 5);
-
-    carBody.setX(baseX);
-    carBody.setY(baseY - 20);
-
-    carTop.getPoints().clear();
-    carTop.getPoints().addAll(baseX + 10, baseY - 20, 
-            baseX + 20, baseY - 30, baseX + 30, baseY - 30, 
-            baseX + 40, baseY - 20);   
-  }
-
-  public void setW(double w) {
-    this.w = w;
-    setValues();
-  }
-
-  public void setH(double h) {
-    this.h = h;
-    baseY = h;
-    setValues();
-  }
 }