Test your basic knowledge |

Object Oriented Programming

Subject : it-skills
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. A special method that has the same name as the class. After the "new" operator creates the object it is invoked to help set it up initially






2. Variables that don't contain any data






3. An object in Java - defined by the class String






4. The one that is invoked






5. Occurs when a value of one type is assigned to a variable of another type during which the value is converted to the new type.






6. A value that is passed into a method when it is invoked






7. White space characters such as space characters - tabs - and new lines that separate the elements of input






8. Widening byte: _________ - to int - to long - to float - to double






9. Returns a new string that is a subset of this string starting at index offset and extending through endIndx-1;






10. Eight primitive data types: four subsets of integers - two subsets of ________ - a character data type - and a boolean data type






11. Returns the number of characters in this stirng.






12. All wrapper classes are defined in ___________






13. Provide various methods related to the management of the associated primitive type. Used when we create an object that serves as a container to hold various types of other objects - and we want the object to hold a simple integer value. In this case






14. Three ways in which Java conversions occur: _________ conversion - promotion - casting






15. A name for a location in memory used to hold a data value.






16. Also called a selection statement b/c it allows us to choose which statement will be executed next.






17. Count++; count--






18. A group of programming statements that is given a name. when a method is invoked - its statements are executed. a set of methods is associated with an object and defines its potential behaviors. to define the ability to make a deposit into a bank acc






19. The idea that we can refer to multiple types of related objects over time in consistent ways. it gives us the ability to design powerful and elegant solutions to problems that deal with multiple objects.






20. Changes a particular value - e.g.setX - where X is the value they are setting.






21. A set of classes that supports the development of programs






22. Methods in the Math class are ______






23. Returns true if the scanner has anotehr token in its input.






24. If the string object str holds the string "987" - the following line of code converts the string into the integer variable 987 and stores that value in the int variable num:






25. A ____________ and definition always give the parameter list in parentheses after the method name. if there are no parameters - an empty set of parentheses is used






26. Represents either a primitive value or an object






27. declaration that creates a String variable that holds a reference to a String object; an object variable doesn't hold an object itself - it holds the address of an object






28. The values passed into a method in an invocation; these are called the arguments to the method






29. Only two valid values: true and false; can indicate whether a particular condition is true - but can also be used to represent any situation that has two states - such as a light bulb being on or off






30. A ________________ is immutable.






31. Returns a new string consisting of this string concatenated with str.






32. The only purpose of a private method is to help other methods of the class do their job. they are referred to as _________






33. A Java operator that is specified by a type name in parentheses; truncates rather than rounds; useful in division if u want an integer to be treated as a float or double






34. Since an object ref var holds the address of the object - it can be thought of as a ____ to the location in memory where the object is held






35. ______________ operators have higher precedence






36. Constants are ______ because the can't be changed once you use the final modifier






37. Returns a string containing the specified number formatted according to this object's pattern.






38. Elements of input






39. When a variable is declared inside a method






40. System.out object represents an output device or file; we send the println message to the System.out object to request that some text be printed






41. The names of the parameters in the header of the method declaration






42. ____________ is instantiated in the traditional way using the new operator.






43. Returns a new string identical to this string except all uppercase letters are converted to their lowercase equivalent.






44. sides=10;






45. Examples of Scanner ________: Scanner (InputStream source) - Scanner(File source) - Scanner(String source)






46. Sets the scanner's delimiting pattern.






47. _____ expression evaluated first






48. Before you use a variable __________it






49. Part of the standard Java class library - provides convenient methods for reading input values of various types. the input can come from various sources - including data typed interactively by the user or data stored in a file; the Scanner class can






50. Attempts to find the next occurence of the specified pattern - ignoring delimiters