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 "bar".
D.The code executes normally， but nothing prints.

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单项选择题

What is the result？（）

A.Cat
B.Dog
C.Compilation fails.
D.The code runs with no output.
E.An exception is thrown at runtime.

单项选择题

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.

多项选择题

Which two changes， taken together， would guarantee the output： 1， 2， 3， 4， 5？（）

A.move the line 12 print statement into the foo（） method
B.change line 7 to public synchronized void go（）{
C.change the variable declaration on line 2 to private volatile int x；
D.wrap the code inside the foo（） method with a synchronized（this） block
E.wrap the for loop code inside the go（） method with a synchronized block synchronized（this）{//for loop code here}