51CTO-310-065

  1 / 14   2 / 14 1. } What is the result? A. The value "4" is printed at the command line. B. Compilation fails because of an error in line 5. C. Compilation fails because of an error in line 9. D. A NullPointerException occurs at runtime. E. A NumberFormatException occurs at runtime. F. An IllegalStateException occurs at runtime. Answer: D 2. Given: 11. public static void main(String[] args) { 12. Object obj = new int[] { 1, 2, 3 }; 13. int[] someArray = (int[])obj; 14. for (int i : someArray) System.out.print(i + " "); 15. } What is the result? A. 1 2 3 B. Compilation fails because of an error in line 12. C. Compilation fails because of an error in line 13. D. Compilation fails because of an error in line 14. E. A ClassCastException is thrown at runtime. Answer: A 3. } 27. 28. System.out.println( fubar( new A() ) ); 29. } 30. 31. public static void main( String[] argv ) { 32. new Beta().testFoo(); 33. } 34. } 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. D. If lines 24, 25 and 26 were removed, compilation would fail. E. If lines 16, 17 and 18 were removed, the code would compile and the output would be 2. F. If lines 24, 25 and 26 were removed, the code would compile and the output would be 1. Answer: BEF 4. } 30.   3 / 14 31. public static void main( String[] argv ) { 32. new Beta().testFoo(); 33. } 34. } 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. D. If lines 24, 25 and 26 were removed, compilation would fail. E. If lines 16, 17 and 18 were removed, the code would compile and the output would be 2. F. If lines 24, 25 and 26 were removed, the code would compile and the output would be 1. Answer: BEF 5. 20. public int fubar( Foo foo ) { return foo.bar(); } 21. 22. public void testFoo() { 23. 24. class A implements Foo { 25. public int bar() { return 2; } 26. } 27. 28. System.out.println( fubar( new A() ) ); 29. } 30. 31. public static void main( String[] argv ) { 32. new Beta().testFoo(); 33. } 34. } 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. D. If lines 24, 25 and 26 were removed, compilation would fail. E. If lines 16, 17 and 18 were removed, the code would compile and the output would be 2. F. If lines 24, 25 and 26 were removed, the code would compile and the output would be 1. Answer: BEF 6. class ClassC extends ClassA {} and: 21. ClassA p0 = new ClassA(); 22. ClassB p1 = new ClassB(); 23. ClassC p2 = new ClassC(); 24. ClassA p3 = new ClassB();   4 / 14 25. ClassA p4 = new ClassC(); Which three are valid? (Choose three.) A. p0 = p1; B. p1 = p2; C. p2 = p4; D. p2 = (ClassC)p1; E. p1 = (ClassB)p3; F. p2 = (ClassC)p4; Answer: AEF 7. } 18. } Which code, inserted at line 15, allows the class Sprite to compile? A. Foo { public int bar() { return 1; } } B. new Foo { public int bar() { return 1; } } C. new Foo() { public int bar() { return 1; } } D. new class Foo { public int bar() { return 1; } } Answer: C 8. } 11. } What is the result? A. The value "4" is printed at the command line. B. Compilation fails because of an error in line 5. C. Compilation fails because of an error in line 9. D. A NullPointerException occurs at runtime. E. A NumberFormatException occurs at runtime. F. An IllegalStateException occurs at runtime. Answer: D 9. Given: 1. public class Boxer1{ 2. Integer i; 3. int x; 4. public Boxer1(int y) { 5. x = i+y; 6. System.out.println(x); 7. } 8. public static void main(String[] args) { 9. new Boxer1(new Integer(4)); 10. } 11. } What is the result? A. The value "4" is printed at the command line.   5 / 14 B. Compilation fails because of an error in line 5. C. Compilation fails because of an error in line 9. D. A NullPointerException occurs at runtime. E. A NumberFormatException occurs at runtime. F. An IllegalStateException occurs at runtime. Answer: D 10. } 16. } and the command line: java -Dprop.custom=gobstopper Commander Which two, placed on line 13, will produce the output gobstopper? (Choose two.) A. System.load("prop.custom"); B. System.getenv("prop.custom"); C. System.property("prop.custom"); D. System.getProperty("prop.custom"); E. System.getProperties().getProperty("prop.custom"); Answer: DE 11. class A implements Foo { 25. public int bar() { return 2; } 26. } 27. 28. System.out.println( fubar( new A() ) ); 29. } 30. 31. public static void main( String[] argv ) { 32. new Beta().testFoo(); 33. } 34. } 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. D. If lines 24, 25 and 26 were removed, compilation would fail. E. If lines 16, 17 and 18 were removed, the code would compile and the output would be 2. F. If lines 24, 25 and 26 were removed, the code would compile and the output would be 1. Answer: BEF 12. System.out.println(x); 7. } 8. public static void main(String[] args) { 9. new Boxer1(new Integer(4)); 10. }   6 / 14 11. } What is the result? A. The value "4" is printed at the command line. B. Compilation fails because of an error in line 5. C. Compilation fails because of an error in line 9. D. A NullPointerException occurs at runtime. E. A NumberFormatException occurs at runtime. F. An IllegalStateException occurs at runtime. Answer: D 13. 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 14. x = i+y; 6. System.out.println(x); 7. } 8. public static void main(String[] args) { 9. new Boxer1(new Integer(4)); 10. } 11. } What is the result? A. The value "4" is printed at the command line. B. Compilation fails because of an error in line 5.   7 / 14 C. Compilation fails because of an error in line 9. D. A NullPointerException occurs at runtime. E. A NumberFormatException occurs at runtime. F. An IllegalStateException occurs at runtime. Answer: D 15. Given: 31. // some code here 32. try { 33. // some code here 34. } catch (SomeException se) { 35. // some code here 36. } finally { 37. // some code here 38. } Under which three circumstances will the code on line 37 be executed? (Choose three.) 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. Answer: BCE 16. System.out.println( fubar( new A() ) ); 29. } 30. 31. public static void main( String[] argv ) { 32. new Beta().testFoo(); 33. } 34. } 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. D. If lines 24, 25 and 26 were removed, compilation would fail. E. If lines 16, 17 and 18 were removed, the code would compile and the output would be 2. F. If lines 24, 25 and 26 were removed, the code would compile and the output would be 1. Answer: BEF 17. public static void main(String[] args) { 9. new Boxer1(new Integer(4)); 10. } 11. } What is the result?   8 / 14 A. The value "4" is printed at the command line. B. Compilation fails because of an error in line 5. C. Compilation fails because of an error in line 9. D. A NullPointerException occurs at runtime. E. A NumberFormatException occurs at runtime. F. An IllegalStateException occurs at runtime. Answer: D 18. class ClassB extends ClassA {} 13. class ClassC extends ClassA {} and: 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(); Which three are valid? (Choose three.) A. p0 = p1; B. p1 = p2; C. p2 = p4; D. p2 = (ClassC)p1; E. p1 = (ClassB)p3; F. p2 = (ClassC)p4; Answer: AEF 19. } 8. public static void main(String[] args) { 9. new Boxer1(new Integer(4)); 10. } 11. } What is the result? A. The value "4" is printed at the command line. B. Compilation fails because of an error in line 5. C. Compilation fails because of an error in line 9. D. A NullPointerException occurs at runtime. E. A NumberFormatException occurs at runtime. F. An IllegalStateException occurs at runtime. Answer: D 20. public int bar() { return 2; } 26. } 27. 28. System.out.println( fubar( new A() ) ); 29. }   9 / 14 30. 31. public static void main( String[] argv ) { 32. new Beta().testFoo(); 33. } 34. } 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. D. If lines 24, 25 and 26 were removed, compilation would fail. E. If lines 16, 17 and 18 were removed, the code would compile and the output would be 2. F. If lines 24, 25 and 26 were removed, the code would compile and the output would be 1. Answer: BEF 21. public int fubar( Foo foo ) { return foo.bar(); } 21. 22. public void testFoo() { 23. 24. class A implements Foo { 25. public int bar() { return 2; } 26. } 27. 28. System.out.println( fubar( new A() ) ); 29. } 30. 31. public static void main( String[] argv ) { 32. new Beta().testFoo(); 33. } 34. } 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. D. If lines 24, 25 and 26 were removed, compilation would fail. E. If lines 16, 17 and 18 were removed, the code would compile and the output would be 2. F. If lines 24, 25 and 26 were removed, the code would compile and the output would be 1. Answer: BEF 22. 28. System.out.println( fubar( new A() ) ); 29. } 30. 31. public static void main( String[] argv ) { 32. new Beta().testFoo();   10 / 14 33. } 34. } 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. D. If lines 24, 25 and 26 were removed, compilation would fail. E. If lines 16, 17 and 18 were removed, the code would compile and the output would be 2. F. If lines 24, 25 and 26 were removed, the code would compile and the output would be 1. Answer: BEF 23. } and the command line: java -Dprop.custom=gobstopper Commander Which two, placed on line 13, will produce the output gobstopper? (Choose two.) A. System.load("prop.custom"); B. System.getenv("prop.custom"); C. System.property("prop.custom"); D. System.getProperty("prop.custom"); E. System.getProperties().getProperty("prop.custom"); Answer: DE 24. 31. public static void main( String[] argv ) { 32. new Beta().testFoo(); 33. } 34. } 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. D. If lines 24, 25 and 26 were removed, compilation would fail. E. If lines 16, 17 and 18 were removed, the code would compile and the output would be 2. F. If lines 24, 25 and 26 were removed, the code would compile and the output would be 1. Answer: BEF 25. new Boxer1(new Integer(4)); 10. } 11. } What is the result? A. The value "4" is printed at the command line. B. Compilation fails because of an error in line 5. C. Compilation fails because of an error in line 9. D. A NullPointerException occurs at runtime.   11 / 14 E. A NumberFormatException occurs at runtime. F. An IllegalStateException occurs at runtime. Answer: D 26. } Which code, inserted at line 15, allows the class Sprite to compile? A. Foo { public int bar() { return 1; } } B. new Foo { public int bar() { return 1; } } C. new Foo() { public int bar() { return 1; } } D. new class Foo { public int bar() { return 1; } } Answer: C 27. 24. class A implements Foo { 25. public int bar() { return 2; } 26. } 27. 28. System.out.println( fubar( new A() ) ); 29. } 30. 31. public static void main( String[] argv ) { 32. new Beta().testFoo(); 33. } 34. } 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. D. If lines 24, 25 and 26 were removed, compilation would fail. E. If lines 16, 17 and 18 were removed, the code would compile and the output would be 2. F. If lines 24, 25 and 26 were removed, the code would compile and the output would be 1. Answer: BEF 28. System.out.println(myProp); 15. } 16. } and the command line: java -Dprop.custom=gobstopper Commander Which two, placed on line 13, will produce the output gobstopper? (Choose two.) A. System.load("prop.custom"); B. System.getenv("prop.custom"); C. System.property("prop.custom"); D. System.getProperty("prop.custom"); E. System.getProperties().getProperty("prop.custom");   12 / 14 Answer: DE 29. 22. public void testFoo() { 23. 24. class A implements Foo { 25. public int bar() { return 2; } 26. } 27. 28. System.out.println( fubar( new A() ) ); 29. } 30. 31. public static void main( String[] argv ) { 32. new Beta().testFoo(); 33. } 34. } 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. D. If lines 24, 25 and 26 were removed, compilation would fail. E. If lines 16, 17 and 18 were removed, the code would compile and the output would be 2. F. If lines 24, 25 and 26 were removed, the code would compile and the output would be 1. Answer: BEF 30. public void testFoo() { 23. 24. class A implements Foo { 25. public int bar() { return 2; } 26. } 27. 28. System.out.println( fubar( new A() ) ); 29. } 30. 31. public static void main( String[] argv ) { 32. new Beta().testFoo(); 33. } 34. } 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. D. If lines 24, 25 and 26 were removed, compilation would fail. E. If lines 16, 17 and 18 were removed, the code would compile and the output would be 2.   13 / 14 F. If lines 24, 25 and 26 were removed, the code would compile and the output would be 1. Answer: BEF   14 / 14 Testinexam company was founded in 2009. Testinexam the company's aim: a more secure way to help you pass any IT certification exams. We provide high-quality certification examination questions and answers. To help customers for the first time test can be passed smoothly. English http://www.testinexam.com Chinese (Traditional) http://www.testinexam.net Chinese (Simplified) http://www.testinexam.org