Summary
-------

Add explicit constructors to some classes in Java AWT APIs which using default constructors.

Problem
-------

Default constructors are not recommended for formal API classes.

Solution
--------

Add the public constructors to the public/non-abstract classes, and protected constructors to the public/abstract classes.

Specification
-------------

    src/java.desktop/share/classes/java/awt/ContainerOrderFocusTraversalPolicy.java
 
    +    /**
    +     * Constructs a {@code ContainerOrderFocusTraversalPolicy}.
    +     */
    +    public ContainerOrderFocusTraversalPolicy() {}

    src/java.desktop/share/classes/java/awt/DefaultFocusTraversalPolicy.java
 
    +    /**
    +     * Constructs a {@code DefaultFocusTraversalPolicy}.
    +     */
    +    public DefaultFocusTraversalPolicy() {}

    src/java.desktop/share/classes/java/awt/DefaultKeyboardFocusManager.java
 
    +    /**
    +     * Constructs a {@code DefaultKeyboardFocusManager}.
    +     */
    +    public DefaultKeyboardFocusManager() {}

    src/java.desktop/share/classes/java/awt/FocusTraversalPolicy.java
     public abstract class FocusTraversalPolicy {
 
    +    /**
    +     * Constructs a {@code FocusTraversalPolicy}.
    +     */
    +    protected FocusTraversalPolicy() {}

    src/java.desktop/share/classes/java/awt/Toolkit.java
     public abstract class Toolkit {
 
    +    /**
    +     * Constructs a {@code Toolkit}.
    +     */
    +    protected Toolkit() {}

    src/java.desktop/share/classes/java/awt/dnd/DragSourceAdapter.java
         implements DragSourceListener, DragSourceMotionListener {
 
    +    /**
    +     * Constructs a {@code DragSourceAdapter}.
    +     */
    +    protected DragSourceAdapter() {}

    src/java.desktop/share/classes/java/awt/dnd/DropTargetAdapter.java
     public abstract class DropTargetAdapter implements DropTargetListener {
 
    +    /**
    +     * Constructs a {@code DropTargetAdapter}.
    +     */
    +    protected DropTargetAdapter() {}

    src/java.desktop/share/classes/java/awt/event/ComponentAdapter.java
     public abstract class ComponentAdapter implements ComponentListener {
    +
    +    /**
    +     * Constructs a {@code ComponentAdapter}.
    +     */
    +    protected ComponentAdapter() {}

    src/java.desktop/share/classes/java/awt/event/ContainerAdapter.java
     public abstract class ContainerAdapter implements ContainerListener {
    +
    +    /**
    +     * Constructs a {@code ContainerAdapter}.
    +     */
    +    protected ContainerAdapter() {}

    src/java.desktop/share/classes/java/awt/event/FocusAdapter.java
     public abstract class FocusAdapter implements FocusListener {
    +
    +    /**
    +     * Constructs a {@code FocusAdapter}.
    +     */
    +    protected FocusAdapter() {}

    src/java.desktop/share/classes/java/awt/event/HierarchyBoundsAdapter.java
     public abstract class HierarchyBoundsAdapter implements HierarchyBoundsListener
     {
    +    /**
    +     * Constructs a {@code HierarchyBoundsAdapter}.
    +     */
    +    protected HierarchyBoundsAdapter() {}

    src/java.desktop/share/classes/java/awt/event/KeyAdapter.java
     public abstract class KeyAdapter implements KeyListener {
    +
    +    /**
    +     * Constructs a {@code KeyAdapter}.
    +     */
    +    protected KeyAdapter() {}

    src/java.desktop/share/classes/java/awt/event/MouseAdapter.java
     public abstract class MouseAdapter implements MouseListener, MouseWheelListener, MouseMotionListener {
    +
    +    /**
    +     * Constructs a {@code MouseAdapter}.
    +     */
    +    protected MouseAdapter() {}

    src/java.desktop/share/classes/java/awt/event/MouseMotionAdapter.java
     public abstract class MouseMotionAdapter implements MouseMotionListener {
    +
    +    /**
    +     * Constructs a {@code MouseMotionAdapter}.
    +     */
    +    protected MouseMotionAdapter() {}

    src/java.desktop/share/classes/java/awt/event/WindowAdapter.java
         public abstract class WindowAdapter implements WindowListener, WindowStateListener, WindowFocusListener
     {
    +    /**
    +     * Constructs a {@code WindowAdapter}.
    +     */
    +    protected WindowAdapter() {}

Link for convenience: http://cr.openjdk.java.net/~serb/8250856/webrev.00