Which statement is true？（）
A.Compilation fails.
B.An exception is thrown at runtime.
C.Synchronizing the run（） method would make the class thread-safe.
D.The data in variable "x" are protected from concurrent access problems.
E.Declaring the doThings（） method as static would make the class thread-safe.
F.Wrapping the statements within doThings（） in a synchronized（new Object（））{} block would make the class thread-safe.
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Given that Triangle implements Runnable， and：
Which two statements， inserted independently at both lines 35 and 41， tend to allow both threads to temporarily pause and allow the other thread to execute？（）
A.Thread.wait（）；
B.Thread.join（）；
C.Thread.yield（）；
D.Thread.sleep（1）；
E.Thread.notify（）；
Which three changes should be made to adapt this class to be used safely by multiple threads？（）
A.declare reset（） using the synchronized keyword
B.declare getName（） using the synchronized keyword
C.declare getCount（） using the synchronized keyword
D.declare the constructor using the synchronized keyword
E.declare increment（） using the synchronized keyword
What is the result？（）
A.Compilation fails.
B.An exception is thrown at runtime.
C.The code executes and prints "running".
D.The code executes and prints "runningrunning".
E.The code executes and prints "runningrunningrunning".
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.
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".
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
A.foo.notify（）；
B.bar.notify（）；
C.foo.notifyAll（）；
D.Thread.notify（）；
E.bar.notifyAll（）；
F.Object.notify（）；
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
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.
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.
最新试题
Which two can be results？（）
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（）？（）
Given a class whose instances， when found in a collection of objects， are sorted by using the compareTo（） method， which two statements are true？（）
Which two changes， taken together， would guarantee the output： 1， 2， 3， 4， 5？（）
What is the result？（）
What is the result？（）
Which code， inserted at line 4， guarantees that this program will output [1， 2]？（）
What is the appropriate definition of the hashCode method in class Person？（）
What is the result？（）
A programmer must create a generic class MinMax and the type parameter of MinMax must implement Comparable. Which implementation of MinMax will compile？（）