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主要内容：
选择题
1:
1.What will happen when you attempt to compile and run the following code?
2.
3.class Base
4.
5.{
6.
7.int i = 99;
8.
9.public void amethod()
10.
11.{
12.
13. System.out.println("Base.amethod()");
14.
15. }
16.
17. Base()
18.
19.{
20.
21. amethod();
22.
23. }
24.
25.}
26.
27.public class Derived extends Base
28.
29.{
30.
31.int i = -1;
32.
33.
34.
35.public static void main(String argv[])
36.
37.{
38.
39. Base b = new Derived();
40.
41. System.out.println(b.i);
42.
43. b.amethod();
44.
45. }
46.
47. public void amethod()
48.
49.{
50.
51. System.out.println("Derived.amethod()");
52.
53. }
54.
55.}
56.
57.Choices:
A.Derived.amethod() -1 Derived.amethod()
B.Derived.amethod() 99
C.Compile time error
D.Derived.amethod()
2:
1.Which is the most appropriate code snippet that can be inserted at line 18 in the following code?
2.
3.(Assume that the code is compiled and run with assertions enabled)
4.
5.1. import java.util.*;
6.
7.2.
8.
9.3. public class AssertTest
10.
11.4. {
12.
13.5. private HashMap cctld;
14.
15.6.
16.
17.7. public AssertTest()
18.
19.8. {
20.
21.9. cctld = new HashMap();
22.
23.10. cctld.put("in", "India");
24.
25.11. cctld.put("uk", "United Kingdom");
26.
27.12. cctld.put("au", "Australia");
28.
29.13. // more code...
30.
31.14. }
32.
33.15. // other methods ....
34.
35.16. public String getCountry(String countryCode)
36.
37.17. {
38.
39.18. // What should be inserted here?
40.
41.19. String country = (String)cctld.get(countryCode);
42.
43.20. return country;
44.
45.21. }
46.
47.22. }
A.assert countryCode != null;
B.assert countryCode != null : "Country code can not be null" ;
C.assert cctld != null : "No country code data is available";
D.assert cctld : "No country code data is available";
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