A.Objects from classes that use aggregation cannot be serialized
B.An object serialized on one JVM can be successfully deserialized on a different JVM
C.The values in fields with the volatile modifier will NOT survive serialization and deserialization
D.The values in fields with the transient modifier will NOT survive serialization and deserialization
E.It is legal to serialize an object of a type that has a supertype that does NOT implement java.io.Serializable
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Given that the current directory is empty， and that the user has read and write privileges to the current directory， and the following：
Which statement is true？（）
A.Compilation fails.
B.Nothing is added to the file system.
C.Only a new file is created on the file system.
D.Only a new directory is created on the file system.
E.Both a new file and a new directory are created on the file system.
If the user types the password aiko when prompted， what is the result？（）
A.password：got
B.password：got aiko
C.password：aiko；got aiko
D.An exception is thrown at runtime.
E.Compilation fails due to an error on line 8.
What is the result？（）
A.Compilation fails.
B.An exception is thrown at runtime.
C.An instance of Forest is serialized.
D.An instance of Forest and an instance of Tree are both serialized.
Which code， inserted at line 14， will allow this class to correctly serialize and deserialize？（）
A.s.defaultReadObject（）；
B.this = s.defaultReadObject（）；
C.y = s.readInt（）； x = s.readInt（）；
D.x = s.readInt（）； y = s.readInt（）；
Given that the current directory is empty， and that the user has read and write permissions， and the following：
Which statement is true？（）
A.Compilation fails.
B.The file system has a new empty directory named dir.
C.The file system has a new empty directory named newDir.
D.The file system has a directory named dir， containing a file f1.txt.
E.The file system has a directory named newDir， containing a file f1.txt.
A.Closing an open stream.
B.Flushing an open stream.
C.Writing to an open stream.
D.Writing a line separator to an open stream.
Assuming that the serializeBanana() and the deserializeBanana() methods will correctly use Java serialization and given：
What is the result？（）
A.restore 400
B.restore 403
C.restore 453
D.Compilation fails.
E.An exception is thrown at runtime.
Which two statements are true if a NullPointerException is thrown on line 3 of class C？（）
A.The application will crash.
B.The code on line 29 will be executed.
C.The code on line 5 of class A will execute.
D.The code on line 5 of class B will execute.
E.The exception will be propagated back to line 27.
Given a method that must ensure that its parameter is not null：
What， inserted at line 12， is the appropriate way to handle a null value？（）
A.assert value == null；
B.assert value != null ： "value is null"；
C.if （value == null）{ throw new AssertionException（"value is null"）； }
D.if （value == null）{ throw new IllegalArgumentException（"value is null"）； }
最新试题
Which statement is true？（）
What is the result？（）
Which two are possible results？（）
What is the result？（）
Given a class whose instances， when found in a collection of objects， are sorted by using the compareTo（） method， which two statements are true？（）
What is the result？（）
What is the result？（）
A programmer iterates over the TreeSet and prints the name of each Drink object. What is the result？（）
A programmer is developing a class Key， that will be used as a key in a standard java.util.HashMap. Which two methods should be overridden to assure that Key works correctly as a key？（）
What is the result？（）