多项选择题

Which three will compile and run without exception？（）

A.private synchronized Object o；
B.void go（）{ synchronized（）{/* code here */}
C.public synchronized void go（）{/* code here */}
D.private synchronized（this） void go（）{/* code here */}
E.void go（）{ synchronized（Object.class）{/* code here */}
F.void go（）{ Object o = new Object（）； synchronized（o）{/* code here */}

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单项选择题

What can be a result？（）

A.Compilation fails.
B.An exception is thrown at runtime.
C.The code executes and prints "StartedComplete".
D.The code executes and prints "StartedComplete0123".
E.The code executes and prints "Started0123Complete".

多项选择题

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.

单项选择题

What is the result？（）

A.Compilation fails.
B.An exception is thrown at runtime.
C.The code executes normally and prints "foo"；
D.The code executes normally， but nothing is printed.