Summary

Add explicit constructors to API classes of javax.swing.plaf.multi that have default constructors.

Problem

Default constructors are not recommended for classes that are parts of a formal API.

Solution

Add explicit no-arg constructors.

Specification

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiButtonUI.java    2020-07-30 13:02:15.589221000 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiButtonUI.java    2020-07-30 13:02:13.104572500 +0530
@@ -42,6 +42,11 @@
 public class MultiButtonUI extends ButtonUI {

     /**
+     * Constructs a {@code MultiButtonUI}.
+     */
+    public MultiButtonUI() {}
+
+    /**
  * The vector containing the real UIs.  This is populated
  * in the call to <code>createUI</code>, and can be obtained by calling
  * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiColorChooserUI.java  2020-07-30 13:02:30.680629300 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiColorChooserUI.java  2020-07-30 13:02:28.447541900 +0530
@@ -42,6 +42,11 @@
 public class MultiColorChooserUI extends ColorChooserUI {

       /**
+     * Constructs a {@code MultiColorChooserUI}.
+     */
+    public MultiColorChooserUI() {}
+
+    /**
  * The vector containing the real UIs.  This is populated
  * in the call to <code>createUI</code>, and can be obtained by calling
  * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiComboBoxUI.java  2020-07-30 13:02:49.482705600 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiComboBoxUI.java  2020-07-30 13:02:46.152954800 +0530
@@ -43,6 +43,11 @@
 public class MultiComboBoxUI extends ComboBoxUI {

     /**
+     * Constructs a {@code MultiComboBoxUI}.
+     */
+    public MultiComboBoxUI() {}
+
+    /**
  * The vector containing the real UIs.  This is populated
  * in the call to <code>createUI</code>, and can be obtained by calling
  * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiDesktopIconUI.java   2020-07-30 13:03:08.573646700 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiDesktopIconUI.java   2020-07-30 13:03:05.003005400 +0530
@@ -42,6 +42,11 @@
 public class MultiDesktopIconUI extends DesktopIconUI {

     /**
+     * Constructs a {@code MultiDesktopIconUI}.
+     */
+    public MultiDesktopIconUI() {}
+
+    /**
  * The vector containing the real UIs.  This is populated
  * in the call to <code>createUI</code>, and can be obtained by calling
  * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiDesktopPaneUI.java   2020-07-30 13:03:29.872501500 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiDesktopPaneUI.java   2020-07-30 13:03:26.167893100 +0530
@@ -42,6 +42,11 @@
 public class MultiDesktopPaneUI extends DesktopPaneUI {

     /**
+     * Constructs a {@code MultiDesktopPaneUI}.
+     */
+    public MultiDesktopPaneUI() {}
+
+    /**
  * The vector containing the real UIs.  This is populated
  * in the call to <code>createUI</code>, and can be obtained by calling
  * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiFileChooserUI.java   2020-07-30 13:03:46.833804700 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiFileChooserUI.java   2020-07-30 13:03:44.166115500 +0530
@@ -47,6 +47,11 @@
 public class MultiFileChooserUI extends FileChooserUI {

     /**
+     * Constructs a {@code MultiFileChooserUI}.
+     */
+    public MultiFileChooserUI() {}
+
+    /**
  * The vector containing the real UIs.  This is populated
  * in the call to <code>createUI</code>, and can be obtained by calling
  * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiInternalFrameUI.java 2020-07-30 13:04:02.842260200 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiInternalFrameUI.java 2020-07-30 13:04:00.504251600 +0530
@@ -42,6 +42,11 @@
 public class MultiInternalFrameUI extends InternalFrameUI {

     /**
+     * Constructs a {@code MultiInternalFrameUI}.
+     */
+    public MultiInternalFrameUI() {}
+
+    /**
  * The vector containing the real UIs.  This is populated
  * in the call to <code>createUI</code>, and can be obtained by calling
  * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiLabelUI.java 2020-07-30 13:04:15.614559300 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiLabelUI.java 2020-07-30 13:04:13.501854400 +0530
@@ -42,6 +42,11 @@
 public class MultiLabelUI extends LabelUI {

     /**
+     * Constructs a {@code MultiLabelUI}.
+     */
+    public MultiLabelUI() {}
+
+    /**
  * The vector containing the real UIs.  This is populated
  * in the call to <code>createUI</code>, and can be obtained by calling
  * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiListUI.java  2020-07-30 13:04:28.581337600 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiListUI.java  2020-07-30 13:04:26.381229400 +0530
@@ -45,6 +45,11 @@
 public class MultiListUI extends ListUI {

     /**
+     * Constructs a {@code MultiListUI}.
+     */
+    public MultiListUI() {}
+
+    /**
  * The vector containing the real UIs.  This is populated
  * in the call to <code>createUI</code>, and can be obtained by calling
  * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiLookAndFeel.java 2020-07-30 13:04:41.848951100 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiLookAndFeel.java 2020-07-30 13:04:39.552172400 +0530
@@ -59,6 +59,11 @@
 @SuppressWarnings("serial") // Same-version serialization only
 public class MultiLookAndFeel extends LookAndFeel {

+    /**
+     * Constructs a {@code MultiLookAndFeel}.
+     */
+    public MultiLookAndFeel() {}
+
 //////////////////////////////
 // LookAndFeel methods
 //////////////////////////////

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiMenuBarUI.java   2020-07-30 13:05:00.121789500 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiMenuBarUI.java   2020-07-30 13:04:57.629549200 +0530
@@ -42,6 +42,11 @@
 public class MultiMenuBarUI extends MenuBarUI {

     /**
+     * Constructs a {@code MultiMenuBarUI}.
+     */
+    public MultiMenuBarUI() {}
+
+    /**
      * The vector containing the real UIs.  This is populated
      * in the call to <code>createUI</code>, and can be obtained by calling
      * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiMenuItemUI.java  2020-07-30 13:05:17.062827900 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiMenuItemUI.java  2020-07-30 13:05:14.324504000 +0530
@@ -43,6 +43,11 @@
 public class MultiMenuItemUI extends MenuItemUI {

     /**
+     * Constructs a {@code MultiMenuItemUI}.
+     */
+    public MultiMenuItemUI() {}
+
+    /**
      * The vector containing the real UIs.  This is populated
      * in the call to <code>createUI</code>, and can be obtained by calling
      * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiOptionPaneUI.java    2020-07-30 13:05:32.447003900 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiOptionPaneUI.java    2020-07-30 13:05:29.819346100 +0530
 @@ -43,6 +43,11 @@
  public class MultiOptionPaneUI extends OptionPaneUI {

     /**
+     * Constructs a {@code MultiOptionPaneUI}.
+     */
+    public MultiOptionPaneUI() {}
+
+    /**
      * The vector containing the real UIs.  This is populated
      * in the call to <code>createUI</code>, and can be obtained by calling
      * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiPanelUI.java 2020-07-30 13:05:50.062008800 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiPanelUI.java 2020-07-30 13:05:46.806792100 +0530
@@ -42,6 +42,11 @@
 public class MultiPanelUI extends PanelUI {

     /**
+     * Constructs a {@code MultiPanelUI}.
+     */
+    public MultiPanelUI() {}
+
+    /**
      * The vector containing the real UIs.  This is populated
      * in the call to <code>createUI</code>, and can be obtained by calling
      * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiPopupMenuUI.java 2020-07-30 13:06:11.049761500 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiPopupMenuUI.java 2020-07-30 13:06:05.977861400 +0530
@@ -45,6 +45,11 @@
  public class MultiPopupMenuUI extends PopupMenuUI {

     /**
+     * Constructs a {@code MultiPopupMenuUI}.
+     */
+    public MultiPopupMenuUI() {}
+
+    /**
      * The vector containing the real UIs.  This is populated
      * in the call to <code>createUI</code>, and can be obtained by calling
      * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiProgressBarUI.java   2020-07-30 13:06:27.268673200 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiProgressBarUI.java   2020-07-30 13:06:24.759595100 +0530
@@ -42,6 +42,11 @@
 public class MultiProgressBarUI extends ProgressBarUI {

     /**
+     * Constructs a {@code MultiProgressBarUI}.
+     */
+    public MultiProgressBarUI() {}
+
+    /**
      * The vector containing the real UIs.  This is populated
      * in the call to <code>createUI</code>, and can be obtained by calling
      * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiRootPaneUI.java  2020-07-30 13:06:44.277860500 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiRootPaneUI.java  2020-07-30 13:06:41.462108400 +0530
@@ -43,6 +43,11 @@
 public class MultiRootPaneUI extends RootPaneUI {

     /**
 +     * Constructs a {@code MultiRootPaneUI}.
+     */
+    public MultiRootPaneUI() {}
+
+    /**
      * The vector containing the real UIs.  This is populated
      * in the call to <code>createUI</code>, and can be obtained by calling
      * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiScrollBarUI.java 2020-07-30 13:06:59.389560500 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiScrollBarUI.java 2020-07-30 13:06:56.763067300 +0530
@@ -42,6 +42,11 @@
 public class MultiScrollBarUI extends ScrollBarUI {

     /**
+     * Constructs a {@code MultiScrollBarUI}.
+     */
+    public MultiScrollBarUI() {}
+
+    /**
      * The vector containing the real UIs.  This is populated
      * in the call to <code>createUI</code>, and can be obtained by calling
      * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiScrollPaneUI.java    2020-07-30 13:07:18.327146100 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiScrollPaneUI.java    2020-07-30 13:07:14.760081000 +0530
@@ -42,6 +42,11 @@
 public class MultiScrollPaneUI extends ScrollPaneUI {

     /**
+     * Constructs a {@code MultiScrollPaneUI}.
+     */
+    public MultiScrollPaneUI() {}
+
+    /**
      * The vector containing the real UIs.  This is populated
      * in the call to <code>createUI</code>, and can be obtained by calling
      * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

 --- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiSeparatorUI.java    2020-07-30 13:07:37.552514300 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiSeparatorUI.java 2020-07-30 13:07:34.452725300 +0530
@@ -42,6 +42,11 @@
 public class MultiSeparatorUI extends SeparatorUI {

     /**
+     * Constructs a {@code MultiSeparatorUI}.
+     */
+    public MultiSeparatorUI() {}
+
+    /**
      * The vector containing the real UIs.  This is populated
      * in the call to <code>createUI</code>, and can be obtained by calling
      * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiSliderUI.java    2020-07-30 13:07:54.004709800 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiSliderUI.java    2020-07-30 13:07:51.480678100 +0530
@@ -42,6 +42,11 @@
  public class MultiSliderUI extends SliderUI {

     /**
+     * Constructs a {@code MultiSliderUI}.
+     */
+    public MultiSliderUI() {}
+
+    /**
      * The vector containing the real UIs.  This is populated
      * in the call to <code>createUI</code>, and can be obtained by calling
      * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiSpinnerUI.java   2020-07-30 13:08:08.275747800 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiSpinnerUI.java   2020-07-30 13:08:06.003576800 +0530
@@ -43,6 +43,11 @@
 public class MultiSpinnerUI extends SpinnerUI {

     /**
+     * Constructs a {@code MultiSpinnerUI}.
+     */
+    public MultiSpinnerUI() {}
+
+    /**
      * The vector containing the real UIs.  This is populated
      * in the call to <code>createUI</code>, and can be obtained by calling
      * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiSplitPaneUI.java 2020-07-30 13:08:26.475579200 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiSplitPaneUI.java 2020-07-30 13:08:24.219814800 +0530
@@ -43,6 +43,11 @@
 public class MultiSplitPaneUI extends SplitPaneUI {

     /**
+     * Constructs a {@code MultiSplitPaneUI}.
+     */
+    public MultiSplitPaneUI() {}
+
+    /**
      * The vector containing the real UIs.  This is populated
      * in the call to <code>createUI</code>, and can be obtained by calling
      * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiTabbedPaneUI.java    2020-07-30 13:08:39.813910600 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiTabbedPaneUI.java    2020-07-30 13:08:37.629855100 +0530
 @@ -44,6 +44,11 @@
 public class MultiTabbedPaneUI extends TabbedPaneUI {

     /**
+     * Constructs a {@code MultiTabbedPaneUI}.
+     */
+    public MultiTabbedPaneUI() {}
+
+    /**
      * The vector containing the real UIs.  This is populated
      * in the call to <code>createUI</code>, and can be obtained by calling
      * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiTableHeaderUI.java   2020-07-30 13:08:53.298489300 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiTableHeaderUI.java   2020-07-30 13:08:50.775300300 +0530
@@ -42,6 +42,11 @@
 public class MultiTableHeaderUI extends TableHeaderUI {

     /**
+     * Constructs a {@code MultiTableHeaderUI}.
+     */
+    public MultiTableHeaderUI() {}
+
+    /**
      * The vector containing the real UIs.  This is populated
      * in the call to <code>createUI</code>, and can be obtained by calling
      * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiTableUI.java 2020-07-30 13:09:07.513196400 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiTableUI.java 2020-07-30 13:09:05.043253500 +0530
@@ -42,6 +42,11 @@
 public class MultiTableUI extends TableUI {

     /**
+     * Constructs a {@code MultiTableUI}.
+     */
+    public MultiTableUI() {}
+
+    /**
      * The vector containing the real UIs.  This is populated
      * in the call to <code>createUI</code>, and can be obtained by calling
      * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiTextUI.java  2020-07-30 13:09:23.458337500 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiTextUI.java  2020-07-30 13:09:20.973072100 +0530
@@ -52,6 +52,11 @@
 public class MultiTextUI extends TextUI {

     /**
+     * Constructs a {@code MultiTextUI}.
+     */
+    public MultiTextUI() {}
+
+    /**
      * The vector containing the real UIs.  This is populated
      * in the call to <code>createUI</code>, and can be obtained by calling
      * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiToolBarUI.java   2020-07-30 13:09:40.692706900 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiToolBarUI.java   2020-07-30 13:09:38.192998700 +0530
@@ -42,6 +42,11 @@
 public class MultiToolBarUI extends ToolBarUI {

     /**
+     * Constructs a {@code MultiToolBarUI}.
+     */
+    public MultiToolBarUI() {}
+
+    /**
      * The vector containing the real UIs.  This is populated
      * in the call to <code>createUI</code>, and can be obtained by calling
      * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiToolTipUI.java   2020-07-30 13:09:56.618310700 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiToolTipUI.java   2020-07-30 13:09:53.140362800 +0530
@@ -42,6 +42,11 @@
 public class MultiToolTipUI extends ToolTipUI {

     /**
+     * Constructs a {@code MultiToolTipUI}.
+     */
+    public MultiToolTipUI() {}
+
+    /**
      * The vector containing the real UIs.  This is populated
      * in the call to <code>createUI</code>, and can be obtained by calling
      * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiTreeUI.java  2020-07-30 13:10:14.602497700    +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiTreeUI.java  2020-07-30 13:10:11.534934500 +0530
@@ -45,6 +45,11 @@
 public class MultiTreeUI extends TreeUI {

     /**
+     * Constructs a {@code MultiTreeUI}.
+     */
+    public MultiTreeUI() {}
+
+    /**
      * The vector containing the real UIs.  This is populated
      * in the call to <code>createUI</code>, and can be obtained by calling
      * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI

--- old/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiViewportUI.java  2020-07-30 13:10:31.288016300 +0530
+++ new/src/java.desktop/share/classes/javax/swing/plaf/multi/MultiViewportUI.java  2020-07-30 13:10:28.730606800 +0530
@@ -42,6 +42,11 @@
 public class MultiViewportUI extends ViewportUI {

     /**
+     * Constructs a {@code MultiViewportUI}.
+     */
+    public MultiViewportUI() {}
+
+    /**
      * The vector containing the real UIs.  This is populated
      * in the call to <code>createUI</code>, and can be obtained by calling
      * the <code>getUIs</code> method.  The first element is guaranteed to be the real UI