KeyEvent Handler帮助 - JAVA

Question

我试图阻止用户除了数字，句点（对于十进制输入）和退格键之外能够在JTextField中键入任何内容。

但是，我提出的代码仍然会阻止这段时间，每次按键都会发出“嘟嘟”声。

以下是代码：

private void SideLengthJTextFieldKeyTyped(java.awt.event.KeyEvent evt) {                                              
            //neglect any keys besides backspace, delete, period, digits

    char keyTyped = evt.getKeyChar();
    if(!(Character.isDigit(keyTyped)) || (keyTyped == KeyEvent.VK_BACK_SPACE) 
            || (keyTyped == KeyEvent.VK_DELETE)
            || (keyTyped == KeyEvent.VK_PERIOD)
            || (keyTyped == KeyEvent.VK_DECIMAL))//works for numpad period
    {
        evt.consume(); //Neglect any invadid keys
        getToolkit().beep();
    }
}