| 8.31.Questions |
| 8.31.1. | Which collection allows you to grow or shrink its size and provides indexed access to its elements, but whose methods are not synchronized? | | |
| 8.31.2. | Answer: collection | | |
| 8.31.3. | What is the result(PriorityQueue)? | | |
| 8.31.4. | Answer: PriorityQueue | | |
| 8.31.5. | What is the output(TreeSet and sub set)? | | |
| 8.31.6. | Answer: TreeSet and sub set | | |
| 8.31.7. | What is the output(TreeMap and ceiling keys)? | | |
| 8.31.8. | Answer: TreeMap and ceiling keys | | |
| 8.31.9. | Which, inserted independently at line 9, will compile? (Choose all that apply.) | | |
| 8.31.10. | Answer: generic and hierarchy | | |
| 8.31.11. | What is the result(TreeSet)? | | |
| 8.31.12. | Answer: TreeSet and class hierarchy | | |
| 8.31.13. | What is the output(implements Comparator)? | | |
| 8.31.14. | Answer: implements Comparator | | |
| 8.31.15. | Instances of which class(es) can be serialized? | | |
| 8.31.16. | Answer: serizlizable objects | | |
| 8.31.17. | What is the output(NumberFormat)? | | |
| 8.31.18. | Answer: NumberFormat | | |
| 8.31.19. | What is the result(pattern matching)? | | |
| 8.31.20. | Answer: pattern matching | | |
| 8.31.21. | What is the result(Scanner)? | | |
| 8.31.22. | Answer: Scanner | | |
| 8.31.23. | Which of the following suggested changes will allow the method to compile? | | |
| 8.31.24. | Answer: Boolean and if statement | | |
| 8.31.25. | You must initialize java.lang.System class if you want to use the System.err output(True/False). | | |
| 8.31.26. | Answer: java.lang.System | | |
| 8.31.27. | The System.arraycopy method works only with arrays of primitives(True/False). | | |
| 8.31.28. | Answer: System.arraycopy method | | |
| 8.31.29. | The System.exit method takes an int primitive parameter(True/False). | | |
| 8.31.30. | Answer: System.exit method | | |
| 8.31.31. | There is a Runtime method to request that the JVM start garbage collection(True/False). | | |
| 8.31.32. | Answer: Runtime method | | |
| 8.31.33. | long avail = Runtime.getRuntime().freeMemory() returns the approximate amount of free memory available to the JVM(True/False) | | |
| 8.31.34. | Answer: Runtime.getRuntime().freeMemory() | | |
| 8.31.35. | A Vector can hold object references or primitive values(True/False). | | |
| 8.31.36. | Answer: Vector and primitive values | | |
| 8.31.37. | A Vector maintains object references in the order they were added(True/False). | | |
| 8.31.38. | Answer: Vector and inserted order | | |