Given：
What is the result？（）
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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Given：
What is the result when the go（） method is invoked？（）
A.00
B.0001
C.000120
D.00012021
E.Compilation fails
F.An exception is thrown at runtime
Given：
Which code， inserted at line 16， will cause a java.lang.ClassCastException？（）
A.Alpha a = x；
B.Foo f = （Delta）x；
C.Foo f = （Alpha）x；
D.Beta b = （Beta）（Alpha）x；
Given:
What is the result？（）
A.2
B.3
C.12
D.23
Click the Exhibit button.
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：
22.StringBuilder sb1 = new StringBuilder（"123"）；
23.String s1 = "123"；
24.// insert code here
25.System.out.println（sb1 + " " + s1）；
Which code fragment， inserted at line 24， outputs "123abc 123abc"？（）
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"）；
Given：
Which method will complete this class？（）
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*/}
Given：
What is the result？（）
A.test end
B.Compilation fails.
C.test runtime end
D.test exception end
E.A Throwable is thrown by main at runtime.
Given that the current directory is empty， and that the user has read and write permissions， and thefollowing：
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.
Given:
What is the output?（）
A.42
B.420
C.462
D.42042
最新试题
Given：What is the result？（）
A team of programmers is involved in reviewing a proposed design for a new utility class. After some discussion， they realize that the current design allows other classes to access methods in the utility class that should be accessible only to methods within the utility class itself.What design issue has the team discovered？（）
Click the Exhibit button.Which statement is true about the set variable on line 12？（）
Given：When the doSomething method is called， after which line does the Object created in line 5 become available for garbage collection？（）
A class games.cards.Poker is correctly defined in the jar file Poker.jar. A user wants to execute the main method of Poker on a UNIX system using the command：java games.cards.Poker What allows the user to do this？（）
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