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. The blueprint of an object. establishes the kind of data an object of that type will hold and defines the methods that represent the behavior of such objects. however - a class contains no space to store data. each object has space for its own data -






2. Instructs the compiler to reserve a portion of main memory space large enough to hold a particular type of value and indicates the name by which we refer to that location






3. 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






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






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






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






7. Boolean type conversions are ___________






8. Specifies the packages and classes that will be used in a program so that the fully qualified name is not necessary with each reference.






9. Before you use a variable __________it






10. ++count; -- count






11. ______________ operators have higher precedence






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






13. The act of creating an object using the "new" operator






14. When a variable is declared inside a method






15. Part of the java.util class; picks a number at random out of a range of values.






16. Methods that provide services to the client must be declared with public visibility so that they can be invoked by the client.






17. 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






18. A ________________ is immutable.






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






20. Every object has two things: a state and a _____ of behaviors






21. 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






22. Count++; count--






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






24. Returns the next input token as the indicated type.






25. 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






26. In the header of a method specifies he types of the values that are passed and the names by which the called method will refer to those values.






27. Five steps of problem-solving: ____________ the problem - Designing a solution - Considering alternatives to the solution and refining the solution - Implementing the solution - Testing the solution and fixing any problems that exist






28. 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.






29. Defined and then used as the type of a variable when it is declared; establishes all possible values of a variable of that type by listing - or enumerating - them.






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






31. Each piece of data that we send to a method






32. After an object has been instantiated - we set the _________ to access its methods






33. The fundamental characteristics that currently define the object. for example - part of a bank account's state is its current balance.






34. Methods in the Math class are ______






35. All wrapper classes are defined in ___________






36. 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:






37. Elements of input






38. Provides generic formatting capabilities for numbers; you don't instantiate a NumberFormat object by using the "new" operator.






39. How classes are created from other classes. the definition of one class can be based on another class that already exists. inheritance is a form of software reuse - capitalizing on the similarities between various kinds of classes that we want to cre






40. Making it difficult - if not impossible - for code outside of a class to "reach in" and chnage the value of a variable that is declared inside that class.






41. The order in which statements are executed in a running program






42. The values it stores internally - which may be represented as primitive data or as other objects. for example - a bank account object can store a floating point number (a primitive value) that represents the balance of the account. it can also contai






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






44. Returns the next input token as a character string.






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






46. An object should be self-governing - meaning that the instance data of an object should be modified only by that object.






47. The one that is invoked






48. When two variables contain the same address and therefore refer to the same object; one important implication of _________ is that when we use one ref to change an object - it is also changed for the other reference because there is really only one o






49. 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






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