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QUESTION: 1 Given: 11. public class Test { 12. public enum Dogs {collie, harrier, shepherd}; 13. public static void main(String [] args) { 14. Dogs myDog = Dogs.shepherd; 15. switch (myDog) { 16. case collie: 17. System.out.print("collie "); 18. case default: 19. System.out.print("retriever "); 20. case harrier: 21. System.out.print("harrier "); 22. } 23. } 24. } What is the result? A. harrier B. shepherd C. retriever D. Compilation fails. E. retriever harrier F. An exception is thrown at runtime. Answer: D QUESTION: 2Given: 10. interface Foo {} 11. class Alpha implements Foo {} 12. class Beta extends Alpha {} 13. class Delta extends Beta { 14. public static void main( String[] args ) { 15. Beta x = new Beta(); 16. // insert code here 17. } 18. } 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; Answer: B QUESTION: 3 A UNIX user named Bob wants to replace his chess program with a new one, but he is not sure where the old one is installed. Bob is currently able to run a Java chess program starting from his home directory /home/bob using the command: java -classpath /test:/home/bob/downloads/*.jar games.Chess Bob'sCLASSPATHisset(atlogintime) to:/usr/lib:/home/bob/classes:/opt/java/lib:/opt/java/lib/*.jarWhat is a possible location for the Chess.class file? A. /test/Chess.class B. /home/bob/Chess.class C. /test/games/Chess.class D. /usr/lib/games/Chess.class E. /home/bob/games/Chess.class F. inside jarfile /opt/java/lib/Games.jar (with a correct manifest) G. inside jarfile /home/bob/downloads/Games.jar (with a correct manifest) Answer: C QUESTION: 4 Given: 21. class Money { 22. private String country = "Canada"; 23. public String getC() { return country; } 24. } 25. class Yen extends Money { 26. public String getC() { return super.country; } 27. } 28. public class Euro extends Money { 29. public String getC(int x) { return super.getC(); } 30. public static void main(String[] args) { 31. System.out.print(new Yen().getC()+ " " + new Euro().getC()); 32. }
} What is the result? A. Canada B. null Canada C. Canada null D. Canada Canada E. Compilation fails due to an error on line 26. F. Compilation fails due to an error on line 29. Answer: E QUESTION: 5 Given: 3. import javA. util.*; 4. public class Hancock { 5. // insert code here 6. list.add("foo"); 7. } 8. } Which two code fragments, inserted independently at line 5, will compile without warnings? (Choose two.) A. public void addStrings(List list){ B. public void addStrings(List list){ C. public void addStrings(List list){ D. public void addStrings(List list){ Answer: B, C QUESTION: 6 Click the Exhibit button. ***Missing Exhibit*** Which three statements are true? (Choose three. ) A. Compilation fails. B. The code compiles and the output is 2. C. If lines 16, 17 and 18 were removed, compilation would fail.
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