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q Each primitive data type has a corresponding wrapper class: Integer, Float, Boolean, and Character. Note the capital letters. q Objects are more advanced data types. They may be defined by a developer or
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found in a built-in Java package.
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q Objects must be initialized by using the new keyword. q Arrays are objects and allow you to store multiple variables together that can
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be accessed by an index.
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q Enumerations are special objects that allow a developer to create a predefined
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set of constants. A variable can then be set to only one of the predefined values.
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q Java is a strongly typed language. Variables must be declared as a type, and
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any value that is stored must be compatible with this type.
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q It is possible to cast a variable to a different data type. If incompatible types
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are cast, an exception will be thrown.
q A literal is a value that is hardcoded in code as the value itself. q Java naming conventions dictate that a class should be named with the first
letter capitalized, along with each sequential word in the name.
q Java naming conventions dictate that a variable should be named with the
first letter being lowercase, and with each sequential word in the name beginning with a capital.
Self Test
selF test
Understanding primitives, enumerations, and Objects
1. You need to create an application that is used to calculate the attendance at a baseball game. What data type would be most appropriate for storing the attendance a. boolean B. char C. float D. int 2. What is the best data type to use if you are required to perform many addition, subtraction, and multiplication calculations on a whole number a. float B. Float C. int D. Integer 3. You are writing a class that will store the status of an on/off switch. Which data type is most appropriate to store this value a. boolean B. char C. float D. int 4. You have decided on the data type for a variable that will store the information about the on/off switch. Now you must determine a name for it. Which of the following names follows the Java naming conventions a. LIGHTSWITCHENABLED B. LightSwitchEnabled C. lightSwitchEnabled D. x
4:
Working with Basic Classes and Variables
5. What is the best data type to use when storing a status code that may have one of the following values: success, failed, success with errors, undetermined a. Object B. Class C. boolean D. enum E. int 6. A system has three sensors attached to it. You need a way to represent this system in your program. What would be the best data type to use to model this system and sensors a. Object B. boolean C. enum D. int 7. The new keyword is used to initialize which of the following data types (Choose all that apply.) a. Object B. boolean C. Boolean D. Float E. float F.
float[]
8. In the following line of code, what does the (int) represent:
number = (int)sensorReading;
a. Rounding the sensorReading variable to the nearest int. B. Casting the sensorReading variable to the int data type. C. Nothing, it is there as a comment. 9. Given the following line of code, which of the lines of code listed are INCORRECT (Choose all that apply.)
char c;
Self Test
a. c = new char(); B. c = 'Y'; C. c = '\u0056'; D. c = "Yes";
practical Uses of primitives, enumerations, and Objects
10. Which of the following variables are being set with the use of a literal (Choose all that apply.) a. int tvChannel = 4; B. char c = '5'; C. char d = '\u0123'; D. char e = c; E. int oldChannel = tvChannel; 11. Given the following line of code, what lines below are valid (Choose all that apply.)
enum Sports { FOOTBALL, BASKETBALL, BASEBALL, TRACK }
a. Sports sport = FOOTBALL; B. Sports sport = Sports.FOOTBALL; C. Sports sport = Sports.HOCKEY; D. Sports sport = 'TRACK' 12. How many objects are referenced in this code segment
int numberOfTrees = 5; Integer ageOfFarm = 14; float averageHeightOfTrees = 124.2f Tree treeType; int[] heightOfEachTree;
a. 0 B. 1 C. 2 D. 3 E. 4 F. 5
4:
Working with Basic Classes and Variables
13. What is the correct way to create an array with five int data types (Choose all that apply.) a. int intArray = new int[5]; B. int intArray = new int(5); C. int[] intArray = new int[5]; D. int intArray[] = new int[5]; 14. What is the correct way to initialize a variable declared with the data type of Book, as a new Book object a. Book b; B. Book b = new Book(); C. Book b = new Book[]; D. Book b = Book(); 15. What is the difference between an int and an Integer a. Nothing. They are both fully interchangeable. B. n int is an object and Integer is a primitive. An int is fastest when performing A calculations. C. An nt is a primitive and Integer is an object. An int is fastest when performing i calculations. This is a trick question. An nteger can be defined to be anything a developer wants I it to be.
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