Test your basic knowledge |

Oracle Sun Certified Java Programmer

Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. An interface cannot extend any extendable (non-final) class - can only...






2. A class is access modified as default. It's methods are access modified as 'public'. What other class files can access the methods in this class?






3. An instance variable cannot be marked...






4. What are the only two access modifiers valid for a Class?






5. Is this identifier name valid? Why or why not? int $_myVar;






6. For any method to be abstract - what must also be true about the class?






7. What is the length in bytes of type 'long' - and what is it's maximum size?






8. What IEEE standard does using strictfp conform to?






9. Where in the source code must a 'package' statement be?






10. What is the purpose of making a field 'transient'?






11. Can a file have no public classes?






12. What is the most basic construction for an Enum?






13. At what point will you get an error if an interface method is 'protected' or 'private'?






14. What Java version began allowing an Enum type?






15. What three non-access modifiers can be used with a class declaration?






16. What is a 'constant specific class body' and where can you use it?






17. If an Enum has a constructor - can you call that constructor?






18. How many interfaces can a class implement?

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19. What modifiers can you use with method parameters?






20. What is the purpose of making a field 'volatile'?

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21. Does an override have to throw all the exceptions of the original method?






22. Where can the brackets for an array declaration go?






23. How many public classes can be defined in one source code file?






24. What is the length in bytes of type 'int' - and what is it's maximum size?






25. What is the purpose of making a class 'abstract'?






26. What is the code format for an abstract method?






27. Enums can be declared...






28. What is the syntax for declaring multiple variables on one line?






29. An original method that will be overriden by a class in the same package as the original could have what access levels and still be considered an 'override'?






30. Which of the three non-access modifiers (strictfp - final - abstract) can and can't be used together in a class declaration?

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31. When accessing an object you really don't have access to (it's 'private' or 'default' in another package - etc) - when will you get an error: at compilation or at run-time?

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32. What kind of error (run-time or compile) do you get when trying to extend a final class?






33. Can an abstract class have a final method?






34. Local ________ can be marked final






35. An instance variable cannot be...






36. How many bits does a primitive 'double' hold?






37. An interface method cannot be...






38. What are the eight primitive types in Java?






39. When would you get an error for a class declaration as follows and why? - protected class Me { }

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40. What are the built-in methods for class Object?






41. What is the purpose of making a method 'native'?






42. How many classes can a class extend?






43. What is the length in bytes of type 'short' - and what is it's maximum size?






44. When overriding a method - the argument list (i.e. signature) must be what?






45. How many non public classes can be in any one file?






46. What is the proper syntax for declaring a var-arg in a method signature?






47. What occurs when a class is marked as 'final'?






48. When overriding a method - the return type must be what?

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49. Can a private method be overriden by a subclass?

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50. The following field is defined in an interface. What do we know about it's access and non-access modifiers? int aNumber = 59;

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