的Java SyntheticEvent上的KeyListener

Question

我在執行某些對話窗口擴展的JDialog，需要實現一些鍵盤快捷方式，例如：

class MyDialog extends JDialog implements KeyListener 
{ 
    /** Constructor 
    * 
    */ 
    public MyDialog() { 

     super(); 

     // add keyboard shortcuts: 
     addKeyListener(this); 
     setFocusable(true); 
    } 

    // --------------------------------------------------------- 
    //     Keyboard shortcuts 
    // --------------------------------------------------------- 
    public void keyReleased(KeyEvent e) {} 
    public void keyTyped(KeyEvent e) {} 
    public void keyPressed(KeyEvent e) 
    { 
     System.out.println(e); 
     if ((e.getKeyCode() == KeyEvent.VK_W) && ((e.getModifiers() & Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()) != 0)) { 
      dispose(); 
     } 
    } 
} 

然後我有幾個不同類型的對話框的擴展MyDialog。當鍵盤快捷鍵被觸發時，我得到的控制檯上的輸出如下：

java.awt.event.KeyEvent[KEY_PRESSED,keyCode=157,keyText=?,keyChar=Undefined keyChar,modifiers=?,extModifiers=?,keyLocation=KEY_LOCATION_LEFT,rawCode=0,primaryLevelUnicode=0,scancode=0] on dialog0 
java.awt.event.KeyEvent[KEY_PRESSED,keyCode=87,keyText=W,keyChar='w',modifiers=?,extModifiers=?,keyLocation=KEY_LOCATION_STANDARD,rawCode=0,primaryLevelUnicode=0,scancode=0] on dialog0 
2013-02-10 19:24:28.716 java[10029:2707] Attempt to call non-applicable method "keyCode" on SyntheticEvent! 
2013-02-10 19:24:28.718 java[10029:2707] (
    0 CoreFoundation      0x00007fff90e5f0a6 __exceptionPreprocess + 198 
    1 libobjc.A.dylib      0x00007fff9617b3f0 objc_exception_throw + 43 
    2 CoreFoundation      0x00007fff90e5ee7c +[NSException raise:format:] + 204 
    3 libawt.jnilib      0x0000000110e3564b -[SyntheticEvent keyCode] + 58 
    4 libawt.jnilib      0x0000000110e397a4 -[NSViewAWT performKeyEquivalent:] + 507 
    5 AppKit        0x00007fff938793c9 -[NSView _performKeyEquivalent:conditionally:] + 41 
    6 AppKit        0x00007fff93879512 -[NSView performKeyEquivalent:] + 166 
    7 AppKit        0x00007fff938793c9 -[NSView _performKeyEquivalent:conditionally:] + 41 
    8 AppKit        0x00007fff93879329 -[NSWindow performKeyEquivalent:] + 64 
    9 AppKit        0x00007fff93879114 -[NSApplication _handleKeyEquivalent:] + 462 
    10 AppKit        0x00007fff93c29232 -[NSWindow keyDown:] + 89 
    11 Foundation       0x00007fff91965677 __NSThreadPerformPerform + 225 
    12 CoreFoundation      0x00007fff90dde101 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 
    13 CoreFoundation      0x00007fff90dddaed __CFRunLoopDoSources0 + 445 
    14 CoreFoundation      0x00007fff90e00dc5 __CFRunLoopRun + 789 
    15 CoreFoundation      0x00007fff90e006b2 CFRunLoopRunSpecific + 290 
    16 HIToolbox       0x00007fff8b4430a4 RunCurrentEventLoopInMode + 209 
    17 HIToolbox       0x00007fff8b442e42 ReceiveNextEventCommon + 356 
    18 HIToolbox       0x00007fff8b442cd3 BlockUntilNextEventMatchingListInMode + 62 
    19 AppKit        0x00007fff93655613 _DPSNextEvent + 685 
    20 AppKit        0x00007fff93654ed2 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 128 
    21 libawt.jnilib      0x0000000110de6fcf -[NSApplicationAWT nextEventMatchingMask:untilDate:inMode:dequeue:] + 124 
    22 AppKit        0x00007fff9364c283 -[NSApplication run] + 517 
    23 libawt.jnilib      0x0000000110de5680 +[AWTStarter startAWT:] + 1495 
    24 libawt.jnilib      0x0000000110de4ffa -[CPerformer perform] + 93 
    25 Foundation       0x00007fff91965677 __NSThreadPerformPerform + 225 
    26 CoreFoundation      0x00007fff90dde101 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 
    27 CoreFoundation      0x00007fff90ddda25 __CFRunLoopDoSources0 + 245 
    28 CoreFoundation      0x00007fff90e00dc5 __CFRunLoopRun + 789 
    29 CoreFoundation      0x00007fff90e006b2 CFRunLoopRunSpecific + 290 
    30 java        0x0000000107c97843 java + 18499 
    31 java        0x0000000107c9729a java + 17050 
    32 java        0x0000000107c94a98 java + 6808 
) 

前兩個東西是println語句，這似乎是正常的。我不知道SyntheticEvent的內容是什麼意思，並且對Google沒有成功。任何人都可以指引我走向正確的方向 - 這有什麼問題？此後窗口正常配置。

謝謝！

Answer 1

不知道輸出是從哪裏來的。

請勿爲此類功能使用KeyListener。請參閱：

1. How to Use Menus，或
2. How to Use Key Bindings