多项选择题

Which two statements are true?（）

A.It is possible for more than two threads to deadlock at once.
B.The JVM implementation guarantees that multiple threads cannot enter into a deadlocked state.
C.Deadlocked threads release once their sleep() method's sleep duration has expired.
D.Deadlocking can occur only when the wait(), notify(), and notifyAll() methods are used incorrectly.
E.It is possible for a single-threaded application to deadlock if synchronized blocks are used incorrectly.
F.If a piece of code is capable of deadlocking, you cannot eliminate the possibility of deadlocking by inserting invocations of Thread.yield().

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单项选择题Given: 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.

单项选择题Given: 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.

单项选择题Given: Which is true?（）

A.If line 10 is removed, the compilation succeeds.
B.If line 11 is removed, the compilation succeeds.
C.If line 12 is removed, the compilation succeeds.
D.If line 13 is removed, the compilation succeeds.
E.More than one line must be removed for compilation to succeed.

单项选择题Given: Which statement is true?（）

A.420 is the output.
B.An exception is thrown at runtime.
C.All constructors must be declared public.
D.Constructors CANNOT use the private modifier.
E.Constructors CANNOT use the protected modifier.

单项选择题A team of programmers is reviewing a proposed API for a new utility class. After some discussion,they realize that they can reduce the number of methods in the API without losing any functionality.If they implement the new design, which two OO principles will they be promoting?（）

A.Looser coupling
B.Tighter coupling
C.Lower cohesion
D.Higher cohesion
E.Weaker encapsulation
F.Stronger encapsulation