src/share/classes/sun/awt/SunToolkit.java

*** 1124,1133 ****
--- 1124,1143 ----
      public int getFocusAcceleratorKeyMask() {
          return InputEvent.ALT_MASK;
      }
  
      /**
+      * Tests whether specified key modifiers mask can be used to enter a printable
+      * character. This is a default implementation of this method, which reflects
+      * the way things work on Windows: here, pressing ctrl + alt allows user to enter
+      * characters from the extended character set (like euro sign or math symbols)
+      */
+     public boolean isPrintableCharacterModifiersMask(int mods) {
+         return ((mods & InputEvent.ALT_MASK) == (mods & InputEvent.CTRL_MASK));
+     }
+ 
+     /**
       * Returns a new input method window, with behavior as specified in
       * {@link java.awt.im.spi.InputMethodContext#createInputMethodWindow}.
       * If the inputContext is not null, the window should return it from its
       * getInputContext() method. The window needs to implement
       * sun.awt.im.InputMethodWindow.