单项选择题X 纠错
A.test end
B.Compilation fails.
C.test runtime end
D.test exception end
E.A Throwable is thrown by main at runtime.
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单项选择题
A.00
B.0001
C.000120
D.00012021
E.Compilation fails
F.An exception is thrown at runtime
单项选择题
A.Alpha a = x；
B.Foo f = （Delta）x；
C.Foo f = （Alpha）x；
D.Beta b = （Beta）（Alpha）x；
单项选择题
A.s.defaultReadObject（）；
B.this = s.defaultReadObject（）；
C.y = s.readInt（）； x = s.readInt（）；
D.x = s.readInt（）； y = s.readInt（）；
单项选择题
A.sb1.append（"abc"）； s1.append（"abc"）；
B.sb1.append（"abc"）； s1.concat（"abc"）；
C.sb1.concat（"abc"）； s1.append（"abc"）；
D.sb1.concat（"abc"）； s1.concat（"abc"）；
E.sb1.append（"abc"）； s1 = s1.concat（"abc"）；
单项选择题
A.public int compareTo（Object o）{/*more code here*/}
B.public int compareTo（Score other）{/*more code here*/}
C.public int compare（Score s1，Score s2）{/*more code here*/}
D.public int compare（Object o1，Object o2）{/*more code here*/}
单项选择题
A.test end
B.Compilation fails.
C.test runtime end
D.test exception end
E.A Throwable is thrown by main at runtime.
单项选择题
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.
单项选择题
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.
