8250811: Address reliance on default constructors in the javax.swing.plaf.multi APIs

Reviewed-by: prr, serb

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiButtonUI.java

@@ -49,6 +49,11 @@ public class MultiButtonUI extends ButtonUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiButtonUI}.
+     */
+    public MultiButtonUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiColorChooserUI.java

@@ -49,6 +49,11 @@ public class MultiColorChooserUI extends ColorChooserUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiColorChooserUI}.
+     */
+    public MultiColorChooserUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiComboBoxUI.java

@@ -50,6 +50,11 @@ public class MultiComboBoxUI extends ComboBoxUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiComboBoxUI}.
+     */
+    public MultiComboBoxUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiDesktopIconUI.java

@@ -49,6 +49,11 @@ public class MultiDesktopIconUI extends DesktopIconUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiDesktopIconUI}.
+     */
+    public MultiDesktopIconUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiDesktopPaneUI.java

@@ -49,6 +49,11 @@ public class MultiDesktopPaneUI extends DesktopPaneUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiDesktopPaneUI}.
+     */
+    public MultiDesktopPaneUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiFileChooserUI.java

@@ -54,6 +54,11 @@ public class MultiFileChooserUI extends FileChooserUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiFileChooserUI}.
+     */
+    public MultiFileChooserUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiInternalFrameUI.java

@@ -49,6 +49,11 @@ public class MultiInternalFrameUI extends InternalFrameUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiInternalFrameUI}.
+     */
+    public MultiInternalFrameUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiLabelUI.java

@@ -49,6 +49,11 @@ public class MultiLabelUI extends LabelUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiLabelUI}.
+     */
+    public MultiLabelUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiListUI.java

@@ -52,6 +52,11 @@ public class MultiListUI extends ListUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiListUI}.
+     */
+    public MultiListUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiLookAndFeel.java

@@ -59,6 +59,11 @@ import javax.swing.plaf.*;
 @SuppressWarnings("serial") // Same-version serialization only
 public class MultiLookAndFeel extends LookAndFeel {
 
+    /**
+     * Constructs a {@code MultiLookAndFeel}.
+     */
+    public MultiLookAndFeel() {}
+
 //////////////////////////////
 // LookAndFeel methods
 //////////////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiMenuBarUI.java

@@ -49,6 +49,11 @@ public class MultiMenuBarUI extends MenuBarUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiMenuBarUI}.
+     */
+    public MultiMenuBarUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiMenuItemUI.java

@@ -50,6 +50,11 @@ public class MultiMenuItemUI extends MenuItemUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiMenuItemUI}.
+     */
+    public MultiMenuItemUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiOptionPaneUI.java

@@ -50,6 +50,11 @@ public class MultiOptionPaneUI extends OptionPaneUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiOptionPaneUI}.
+     */
+    public MultiOptionPaneUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiPanelUI.java

@@ -49,6 +49,11 @@ public class MultiPanelUI extends PanelUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiPanelUI}.
+     */
+    public MultiPanelUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiPopupMenuUI.java

@@ -52,6 +52,11 @@ public class MultiPopupMenuUI extends PopupMenuUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiPopupMenuUI}.
+     */
+    public MultiPopupMenuUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiProgressBarUI.java

@@ -49,6 +49,11 @@ public class MultiProgressBarUI extends ProgressBarUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiProgressBarUI}.
+     */
+    public MultiProgressBarUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiRootPaneUI.java

@@ -50,6 +50,11 @@ public class MultiRootPaneUI extends RootPaneUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiRootPaneUI}.
+     */
+    public MultiRootPaneUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiScrollBarUI.java

@@ -49,6 +49,11 @@ public class MultiScrollBarUI extends ScrollBarUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiScrollBarUI}.
+     */
+    public MultiScrollBarUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiScrollPaneUI.java

@@ -49,6 +49,11 @@ public class MultiScrollPaneUI extends ScrollPaneUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiScrollPaneUI}.
+     */
+    public MultiScrollPaneUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiSeparatorUI.java

@@ -49,6 +49,11 @@ public class MultiSeparatorUI extends SeparatorUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiSeparatorUI}.
+     */
+    public MultiSeparatorUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiSliderUI.java

@@ -49,6 +49,11 @@ public class MultiSliderUI extends SliderUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiSliderUI}.
+     */
+    public MultiSliderUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiSpinnerUI.java

@@ -50,6 +50,11 @@ public class MultiSpinnerUI extends SpinnerUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiSpinnerUI}.
+     */
+    public MultiSpinnerUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiSplitPaneUI.java

@@ -50,6 +50,11 @@ public class MultiSplitPaneUI extends SplitPaneUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiSplitPaneUI}.
+     */
+    public MultiSplitPaneUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiTabbedPaneUI.java

@@ -51,6 +51,11 @@ public class MultiTabbedPaneUI extends TabbedPaneUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiTabbedPaneUI}.
+     */
+    public MultiTabbedPaneUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiTableHeaderUI.java

@@ -49,6 +49,11 @@ public class MultiTableHeaderUI extends TableHeaderUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiTableHeaderUI}.
+     */
+    public MultiTableHeaderUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiTableUI.java

@@ -49,6 +49,11 @@ public class MultiTableUI extends TableUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiTableUI}.
+     */
+    public MultiTableUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiTextUI.java

@@ -59,6 +59,11 @@ public class MultiTextUI extends TextUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiTextUI}.
+     */
+    public MultiTextUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiToolBarUI.java

@@ -49,6 +49,11 @@ public class MultiToolBarUI extends ToolBarUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiToolBarUI}.
+     */
+    public MultiToolBarUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiToolTipUI.java

@@ -49,6 +49,11 @@ public class MultiToolTipUI extends ToolTipUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiToolTipUI}.
+     */
+    public MultiToolTipUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiTreeUI.java

@@ -52,6 +52,11 @@ public class MultiTreeUI extends TreeUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiTreeUI}.
+     */
+    public MultiTreeUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////

src/java.desktop/share/classes/javax/swing/plaf/multi/MultiViewportUI.java

@@ -49,6 +49,11 @@ public class MultiViewportUI extends ViewportUI {
      */
     protected Vector<ComponentUI> uis = new Vector<>();
 
+    /**
+     * Constructs a {@code MultiViewportUI}.
+     */
+    public MultiViewportUI() {}
+
 ////////////////////
 // Common UI methods
 ////////////////////