src/share/classes/java/awt/KeyboardFocusManager.java

*** 346,355 ****
--- 346,356 ----
       * in effect on all Windows that have no such array of their own explicitly
       * set. Each array will also be inherited, recursively, by any child
       * Component of those Windows that has no such array of its own explicitly
       * set.
       */
+     @SuppressWarnings({"unchecked", "rawtypes"})
      private Set<AWTKeyStroke>[] defaultFocusTraversalKeys = new Set[4];
  
      /**
       * The current focus cycle root. If the focus owner is itself a focus cycle
       * root, then it may be ambiguous as to which Components represent the next
*** 420,430 ****
          StringTokenizer tokens = new StringTokenizer(value, ",");
          while (tokens.hasMoreTokens()) {
              targetSet.add(AWTKeyStroke.getAWTKeyStroke(tokens.nextToken()));
          }
          return (targetSet.isEmpty())
!             ? Collections.EMPTY_SET
              : Collections.unmodifiableSet(targetSet);
      }
  
      /**
       * Initializes a KeyboardFocusManager.
--- 421,431 ----
          StringTokenizer tokens = new StringTokenizer(value, ",");
          while (tokens.hasMoreTokens()) {
              targetSet.add(AWTKeyStroke.getAWTKeyStroke(tokens.nextToken()));
          }
          return (targetSet.isEmpty())
!             ? Collections.emptySet()
              : Collections.unmodifiableSet(targetSet);
      }
  
      /**
       * Initializes a KeyboardFocusManager.
*** 434,444 ****
              Set<AWTKeyStroke> work_set = new HashSet<>();
              for (int j = 0; j < defaultFocusTraversalKeyStrokes[i].length; j++) {
                  work_set.add(defaultFocusTraversalKeyStrokes[i][j]);
              }
              defaultFocusTraversalKeys[i] = (work_set.isEmpty())
!                 ? Collections.EMPTY_SET
                  : Collections.unmodifiableSet(work_set);
          }
          initPeer();
      }
  
--- 435,445 ----
              Set<AWTKeyStroke> work_set = new HashSet<>();
              for (int j = 0; j < defaultFocusTraversalKeyStrokes[i].length; j++) {
                  work_set.add(defaultFocusTraversalKeyStrokes[i][j]);
              }
              defaultFocusTraversalKeys[i] = (work_set.isEmpty())
!                 ? Collections.emptySet()
                  : Collections.unmodifiableSet(work_set);
          }
          initPeer();
      }
  
*** 1748,1762 ****
       *
       * @return a possibly null or empty List of KeyEventDispatchers
       * @see #addKeyEventDispatcher
       * @see #removeKeyEventDispatcher
       */
      protected synchronized java.util.List<KeyEventDispatcher>
          getKeyEventDispatchers()
      {
          return (keyEventDispatchers != null)
!             ? (java.util.List)keyEventDispatchers.clone()
              : null;
      }
  
      /**
       * Adds a KeyEventPostProcessor to this KeyboardFocusManager's post-
--- 1749,1764 ----
       *
       * @return a possibly null or empty List of KeyEventDispatchers
       * @see #addKeyEventDispatcher
       * @see #removeKeyEventDispatcher
       */
+     @SuppressWarnings("unchecked") // Cast of result of clone
      protected synchronized java.util.List<KeyEventDispatcher>
          getKeyEventDispatchers()
      {
          return (keyEventDispatchers != null)
!             ? (java.util.List<KeyEventDispatcher>)keyEventDispatchers.clone()
              : null;
      }
  
      /**
       * Adds a KeyEventPostProcessor to this KeyboardFocusManager's post-
*** 1839,1853 ****
       *
       * @return a possibly null or empty List of KeyEventPostProcessors
       * @see #addKeyEventPostProcessor
       * @see #removeKeyEventPostProcessor
       */
      protected java.util.List<KeyEventPostProcessor>
          getKeyEventPostProcessors()
      {
          return (keyEventPostProcessors != null)
!             ? (java.util.List)keyEventPostProcessors.clone()
              : null;
      }
  
  
  
--- 1841,1856 ----
       *
       * @return a possibly null or empty List of KeyEventPostProcessors
       * @see #addKeyEventPostProcessor
       * @see #removeKeyEventPostProcessor
       */
+     @SuppressWarnings("unchecked") // Cast of result of clone
      protected java.util.List<KeyEventPostProcessor>
          getKeyEventPostProcessors()
      {
          return (keyEventPostProcessors != null)
!             ? (java.util.List<KeyEventPostProcessor>)keyEventPostProcessors.clone()
              : null;
      }
  
  
  
*** 1905,1916 ****
      /*
       * Please be careful changing this method! It is called from
       * javax.swing.JComponent.runInputVerifier() using reflection.
       */
      static synchronized Component getMostRecentFocusOwner(Window window) {
!         WeakReference<Component> weakValue =
!             (WeakReference)mostRecentFocusOwners.get(window);
          return weakValue == null ? null : weakValue.get();
      }
  
      /**
       * This method is called by the AWT event dispatcher requesting that the
--- 1908,1918 ----
      /*
       * Please be careful changing this method! It is called from
       * javax.swing.JComponent.runInputVerifier() using reflection.
       */
      static synchronized Component getMostRecentFocusOwner(Window window) {
!         WeakReference<Component> weakValue = mostRecentFocusOwners.get(window);
          return weakValue == null ? null : weakValue.get();
      }
  
      /**
       * This method is called by the AWT event dispatcher requesting that the