2011年JAVA认证模拟题（31）
Q91 After which line in the following code is the Vector object, created in line 4, first subject to garbage collection?1. import java.util.*;
2. public class Question {
3. public static void main(String[] args) {
4. Vector v1 = new Vector();
5. Vector v2 = new Vector();
6. v1 = null;
7. Vector v3 = v1;
8. v1 = v2;
9. v1.add(“This”);
10. v1.add(v2);
11. String s = (String) v1.elementAt(0);
12. v1 = v2;
13. v2 = v1;
14. v1.add(s);
15. ｝
16.｝
A line 6
B line 7
C line 8
D line 12
Q92 In order for the public class MyClass to successfully compile, which of the
following are true?
A MyClass must have a correctly formed main() method.
B MyClass must be defined in the file MyClass.java
C MyClass must be defined in the MyClass package
D MyClass must be imported.
Q93 Which of the following are true about the Error and Exception classes?
A Both classes extend Throwable.
B The Error class is final, and the Exception class is not.
C The Exception class is final and the Error class is not.
D Both classes implement Throwable.
Q091 A
Q092 B
Q093 A
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