单选题Which statement is true？（）A  If only one thread is blocked in the wait method of an object， and another thread executes the modify on that same object， then the first thread immediately resumes execution.B  If a thread is blocked in the wait method of 

第1题：

Which two CANNOT directly cause a thread to stop executing？（）

• A、 Calling the yield method.
• B、 Calling the wait method on an object.
• C、 Calling the notify method on an object.
• D、 Calling the notifyAll method on an object.
• E、 Calling the start method on another Thread object.

第2题：

Which statements concerning the methods notify（） and notifyAll（） are true？  

• A、Instances of class Thread have a method called notify（）.
• B、A call to the method notify（） will wake the thread that currently owns the monitor of the object.
• C、The method notify（） is synchronized.
• D、The method notifyAll（） is defined in class Thread.
• E、When there is more than one thread waiting to obtain the monitor of an object， there is no way to be     sure which thread will be notified by the notify（） method.

第3题：

第4题：

Given that t1 is a reference to a live thread， which is true？（）

• A、The Thread.sleep（） method can take t1 as an argument.
• B、The Object.notify（） method can take t1 as an argument.
• C、The Thread.yield（） method can take t1 as an argument.
• D、The Thread.setPriority（） method can take t1 as an argument.
• E、The Object.notify（） method arbitrarily chooses which thread to notify.

第5题：

What happens when thread X executes a wait（） method on object A， without owning object A’s lock？（）  

• A、 Compilation fails.
• B、 An exception is thrown.
• C、 The wait（） method has no effect.
• D、 Thread X receives the lock immediately.
• E、 Object A moves the thread to the wait pool.

第6题：

Which two of statements are true？（）

• A、It is possible to synchronize static methods.
• B、When a thread has yielded as a result of yield（）， it releases its locks.
• C、When a thread is sleeping as a result of sleep（）， it releases its locks.
• D、The Object.wait（） method can be invoked only from a synchronized context.
• E、The Thread.sleep（） method can be invoked only from a synchronized context.
• F、When the thread scheduler receives a notify（） request， and notifies a thread， that thread immediately releases its lock.

第7题：

Under which circumstances will a thread stop？（）  

• A、The method waitforId（） in class MediaTracker is called.
• B、The run（） method that the thread is executing ends.
• C、The call to the start（） method of the Thread object returns.
• D、The suspend（） method is called on the Thread object.
• E、The wait（） method is called on the Thread object.

第8题：

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.

第9题：

Given：  foo and bar are public references available to many other threads， foo refers to a Thread and bar is an Object. The thread foo is currently executing bar.wait（）.  From another thread， what provides the most reliable way to ensure that foo will stop executing wait（）？（）

• A、foo.notify（）；
• B、bar.notify（）；
• C、foo.notifyAll（）；
• D、Thread.notify（）；
• E、bar.notifyAll（）；
• F、Object.notify（）；

第10题：

Which two can directly cause a thread to stop executing？（） 

• A、 Exiting from a synchronized block.
• B、 Calling the wait method on an object.
• C、 Calling the notify method on an object.
• D、 Calling the notifyAll method on an object.
• E、 Calling the setPriority method on a thread object.