void waitForSignal（） { Object obj = new Object（）； synchronized （Thread.currentThread（）） { obj.wait（）； obj.notify（）； } } Which is true？（）
- A This code may throw an InterruptedException.
- B This code may throw an IllegalStateException.
- C This code may throw a TimeoutException after ten minutes.
- D This code will not compile unless “obj.wait（）” is replaced with “（（Thread） obj）.wait（）”.
- E Reversing the order of obj.wait（） and obj.notify（） may cause this method to complete normally.
- F A call to notify（） or notifyAll（） from another thread may cause this method to complete normally.