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.
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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"); }
Which two code fragments are most likely to cause a StackOverflowError?()
A.A
B.B
C.C
D.D
E.E
F.F
What is the result?()
A.X, followed by an Exception.
B.No output, and an Exception is thrown.
C.Compilation fails due to an error on line 14.
D.Compilation fails due to an error on line 16.
E.Compilation fails due to an error on line 17.
F.X, followed by an Exception, followed by B
最新试题
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()?()
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Which code, inserted at line 4, guarantees that this program will output [1, 2]?()
Which two can be results?()
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