SCJP程序員認證考試章節(jié)練習(2020.06.06)

A. Ex0 caught
B. exception caught
C. Compilation fails because of an error at line 2.
D. Compilation fails because of an error at line 6.

A. x.delete（）
B. x.finalize（）
C. Runtime.getRuntime（）.gc（）
D. Explicitly setting the object’s reference to null.
E. Ensuring there are no references to the object.
F. Only the garbage collection system can destroy an object.

A.Hello
B.Hello World
C.Compilation fails.
D.Hello World 5
E.The code runs with no output.
F.An exception is thrown at runtime.

A.text
B.Compilation fails.
C.<msg>text</msg>
D.An exception is thrown at runtime.

A.Compilation fails.
B.ClassC is displayed.
C.The code runs with no output.
D.An exception is thrown at runtime.

A. Yen returns correct values.
B. Euro returns correct values.
C. An exception is thrown at runtime.
D. Yen and Euro both return correct values.
E. Compilation fails because of an error at line 25.
F. Compilation fails because of an error at line 30.

A. i2 == startingI returns true.
B. i2 == startingI returns false.
C. i2.equals（startingI） returns true.
D. i2.equals（startingI） returns false.

A.Instances of class Thread have a method called notify（）.
B.A call to the method notify（） will wake the thread that currently owns the monitor of the object.
C.The method notify（） is synchronized.
D.The method notifyAll（） is defined in class Thread.
E.When there is more than one thread waiting to obtain the monitor of an object， there is no way to be     sure which thread will be notified by the notify（） method.

A. New dataInputStream（“in.txt”）；
B. New dataInputStream（new file（“in.txt”））；
C. New dataInputStream（new writer（“in.txt”））；
D. New dataInputStream（new FileWriter（“in.txt”））；
E. New dataInputStream（new InputStream（“in.txt”））；
F. New dataInputStream（new FileInputStream（“in.txt”））；

A. An anonymous class can be declared as static.
B. A static inner class cannot be a static member of the outer class.
C. A static inner class does not require an instance of the enclosing class.
D. Instance members of a static inner class can be referenced using the class name of the static inner class.