310-055Big5 Exam

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Exam : SUN 310-055Big5
Title : Sun Certified Programmer for the Java 2 Platform.SE 5.0


1. 現有：
public class NamedCounter {
private final String name;
private int count;
public NamedCounter(String name) { this.name = name; }
public String getName() { return name; }
public void increment() { count++; }
public int getCount() { return count; }
public void reset() { count = 0; }
}
應該做哪三項修改，才能調整這個類別，以供多個執行緒安全地使用？（選擇三項。）
A. 用synchronized關鍵字宣告reset()
B. 用synchronized關鍵字宣告getName()
C. 用synchronized關鍵字宣告getCount()
D. 用synchronized關鍵字宣告建構元
E. 用synchronized關鍵字宣告increment()
Answer: ACE

2. 現有：
10. int x = 0;
11. int y = 10;
12. do {
13. y--;
14. ++x;
15. } while (x < 5);
16. System.out.print(x + "," + y);
結果為何？
A. 5,6
B. 5,5
C. 6,5
D. 6,6
Answer: B

3. 現有：
1. interface DoStuff2 {
2. float getRange(int low, int high); }
3.
4. interface DoMore {
5. float getAvg(int a, int b, int c); }
6.
7. abstract class DoAbstract implements DoStuff2, DoMore { }
8.
9. class DoStuff implements DoStuff2 {
10. public float getRange(int x, int y) { return 3.14f; } }
11.
12. interface DoAll extends DoMore {
13. float getAvg(int a, int b, int c, int d); }
結果為何？
A. 檔案可以編譯，而沒有錯誤。
B. 編譯失敗。只有第7行有一個錯誤。
C. 編譯失敗。只有第12行有一個錯誤。
D. 編譯失敗。只有第13行有一個錯誤。
E. 編譯失敗。只有第7行與第12行有錯誤。
F. 編譯失敗。只有第7行與第13行有錯誤。
G. 編譯失敗。第7、12、與13行有錯誤。
Answer: A

4. 現有：
10: public class Hello {
11: String title;
12: int value;
13: public Hello() {
14: title += " World";
15: }
16: public Hello(int value) {
17: this.value = value;
18: title = "Hello";
19: Hello();
20: }
21: }
以及：
30: Hello c = new Hello(5);
31: System.out.println(c.title);
結果為何？
A. Hello
B. Hello World
C. 編譯失敗。
D. Hello World 5
E. 這個程式碼可以執行，但沒有輸出。
F. 在執行時期丟出了一個例外。
Answer: C

5. 現有：
12. public class Wow {
13. public static void go(short n) {System.out.println("short");}
14. public static void go(Short n) {System.out.println("SHORT");}
15. public static void go(Long n) {System.out.println(" LONG");}
16. public static void main(String [] args) {
17. Short y = 6;
18. int z = 7;
19. go(y);
20. go(z);
21. }
22. }
結果為何？
A. short LONG
B. SHORT LONG
C. 編譯失敗。
D. 在執行時期丟出了一個例外。
Answer: C

6. 現有：
11. class ClassA {}
12. class ClassB extends ClassA {}
13. class ClassC extends ClassA {}
以及：
21. ClassA p0 = new ClassA();
22. ClassB p1 = new ClassB();
23. ClassC p2 = new ClassC();
24. ClassA p3 = new ClassB();
25. ClassA p4 = new ClassC();
哪三項是正確的？（選擇三項。）
A. p0 = p1;
B. p1 = p2;
C. p2 = p4;
D. p2 = (ClassC)p1;
E. p1 = (ClassB)p3;
F. p2 = (ClassC)p4;
Answer: AEF

7. 現有：
11. public static void parse(String str) {
12. try {
13. float f = Float.parseFloat(str);
14. } catch (NumberFormatException nfe) {
15. f = 0;
16. } finally {
17. System.out.println(f);
18. }
19. }
20. public static void main(String[] args) {
21. parse("invalid");
22. }
結果為何？
A. 0.0
B. 編譯失敗。
C. 在執行時期parse方法會丟出一個ParseException。
D. 在執行時期parse方法會丟出一個NumberFormatException。
Answer: B

8. 現有：
11. String test = "This is a test";
12. String[] tokens = test.split("s");
13. System.out.println(tokens.length);
結果為何？
A. 0
B. 1
C. 4
D. 編譯失敗。
E. 在執行時期丟出了一個例外。
Answer: D

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