Given：
Under which three circumstances will the code on line 37 be executed？（）
A.The instance gets garbage collected.
B.The code on line 33 throws an exception.
C.The code on line 35 throws an exception.
D.The code on line 31 throws an exception.
E.The code on line 33 executes successfully.
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Given：
If some sort of exception is thrown at line 34， which output is possible？（）
A.a
B.b
C.c
D.ac
E.abc
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：
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.
最新试题
Given：What is the result？（）
Click the Exhibit button.Which statement is true about the set variable on line 12？（）
Given：What is the result？（）
Given：What is the result？（）
Given：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？（）
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？（）
Given：What is the result？（）
Given：When the doSomething method is called， after which line does the Object created in line 5 become available for garbage collection？（）
Given：What is the result？（）
Given:What is the result？（）