8283700: Add final or sealed modifier to appropriate java.awt API classes

Reviewed-by: darcy, aivanov, serb, psadhukhan

src/java.desktop/share/classes/java/awt/GridBagLayoutInfo.java

@@ -36,7 +36,7 @@ import java.io.Serial;
  * @see       java.awt.GridBagConstraints
  * @since 1.6
  */
-public class GridBagLayoutInfo implements java.io.Serializable {
+public final class GridBagLayoutInfo implements java.io.Serializable {
 
     /**
      * Use serialVersionUID from JDK 1.6 for interoperability.

src/java.desktop/share/classes/java/awt/PointerInfo.java

@@ -41,7 +41,7 @@ package java.awt;
  * @author Roman Poborchiy
  * @since 1.5
  */
-public class PointerInfo {
+public final class PointerInfo {
 
     private final GraphicsDevice device;
     private final Point location;

src/java.desktop/share/classes/java/awt/ScrollPaneAdjustable.java

@@ -40,7 +40,7 @@ import sun.awt.AWTAccessor;
  *
  * @since       1.4
  */
-public class ScrollPaneAdjustable implements Adjustable, Serializable {
+public final class ScrollPaneAdjustable implements Adjustable, Serializable {
 
     /**
      * The {@code ScrollPane} this object is a scrollbar of.

src/java.desktop/share/classes/java/awt/TextArea.java

@@ -55,7 +55,7 @@ import javax.accessibility.AccessibleStateSet;
  * @author      Sami Shaio
  * @since       1.0
  */
-public class TextArea extends TextComponent {
+public non-sealed class TextArea extends TextComponent {
 
     /**
      * The number of rows in the {@code TextArea}.

src/java.desktop/share/classes/java/awt/TextComponent.java

@@ -67,7 +67,9 @@ import sun.awt.InputMethodSupport;
  * @author      Arthur van Hoff
  * @since       1.0
  */
-public class TextComponent extends Component implements Accessible {
+public sealed class TextComponent extends Component implements Accessible
+     permits TextArea,
+             TextField {
 
     /**
      * The value of the text.

src/java.desktop/share/classes/java/awt/TextField.java

@@ -99,7 +99,7 @@ import javax.accessibility.AccessibleStateSet;
  * @see         java.awt.TextField#addActionListener
  * @since       1.0
  */
-public class TextField extends TextComponent {
+public non-sealed class TextField extends TextComponent {
 
     /**
      * The number of columns in the text field.

src/java.desktop/share/classes/java/awt/desktop/AppEvent.java

@@ -37,7 +37,18 @@ import java.util.EventObject;
  *
  * @since 9
  */
-public class AppEvent extends EventObject {
+public sealed class AppEvent extends EventObject
+    permits AboutEvent,
+            AppForegroundEvent,
+            AppHiddenEvent,
+            AppReopenedEvent,
+            FilesEvent,
+            OpenURIEvent,
+            PreferencesEvent,
+            QuitEvent,
+            ScreenSleepEvent,
+            SystemSleepEvent,
+            UserSessionEvent {
 
     /**
      * Use serialVersionUID from JDK 9 for interoperability.

src/java.desktop/share/classes/java/awt/desktop/FilesEvent.java

@@ -38,7 +38,9 @@ import java.util.List;
  *
  * @since 9
  */
-public class FilesEvent extends AppEvent {
+public sealed class FilesEvent extends AppEvent
+    permits OpenFilesEvent,
+            PrintFilesEvent {
 
     /**
      * Use serialVersionUID from JDK 9 for interoperability.

src/java.desktop/share/classes/java/awt/dnd/DropTargetContext.java

@@ -53,7 +53,7 @@ import sun.awt.AWTAccessor.DropTargetContextAccessor;
  * @since 1.2
  */
 
-public class DropTargetContext implements Serializable {
+public final class DropTargetContext implements Serializable {
 
     /**
      * Use serialVersionUID from JDK 1.4 for interoperability.

src/java.desktop/share/classes/java/awt/event/InputEvent.java

@@ -57,7 +57,9 @@ import sun.util.logging.PlatformLogger;
  *
  * @since 1.1
  */
-public abstract class InputEvent extends ComponentEvent {
+public abstract sealed class InputEvent extends ComponentEvent
+    permits KeyEvent,
+            MouseEvent {
 
     private static final PlatformLogger logger = PlatformLogger.getLogger("java.awt.event.InputEvent");
 

src/java.desktop/share/classes/java/awt/event/KeyEvent.java

@@ -151,7 +151,7 @@ import sun.awt.AWTAccessor;
  *
  * @since 1.1
  */
-public class KeyEvent extends InputEvent {
+public non-sealed class KeyEvent extends InputEvent {
 
     /**
      * Stores the state of native event dispatching system

src/java.desktop/share/classes/java/awt/event/MouseEvent.java

@@ -189,7 +189,7 @@ import sun.awt.SunToolkit;
  *
  * @since 1.1
  */
-public class MouseEvent extends InputEvent {
+public non-sealed class MouseEvent extends InputEvent {
 
     /**
      * The first number in the range of ids used for mouse events.