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 "sleep".
D.The code executes normally, but nothing is printed.


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1.单项选择题

What is the result?()

A.The code will deadlock.
B.The code may run with no output.
C.An exception is thrown at runtime.
D.The code may run with output "0 6".
E.The code may run with output "2 0 6 4".
F.The code may run with output "0 2 4 6".

2.多项选择题

Which two statements are true?()

A.The output could be 8-1,7-2,8-2,7-1
B.The output could be 7-1,7-2,8-1,6-1
C.The output could be 8-1,7-1,7-2,8-2
D.The output could be 8-1,8-2,7-1,7-2

4.多项选择题

Which two are possible results?()

A.0, 2, 4, 4, 6, 8, 10, 6
B.0, 2, 4, 6, 8, 10, 2, 4
C.0, 2, 4, 6, 8, 10, 12, 14
D.0, 0, 2, 2, 4, 4, 6, 6, 8, 8, 10, 10, 12, 12, 14, 14
E.0, 2, 4, 6, 8, 10, 12, 14, 0, 2, 4, 6, 8, 10, 12, 14

5.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.

6.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.

7.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.

8.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}

9.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 */}

10.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".