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Printer Code-39 in Java D. This is a trick question. There is no such thing as an Integer. E.

D. This is a trick question. There is no such thing as an Integer. E.
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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 Answer:
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3 D . The attendance of a baseball game is going to be a whole number within the range of an int.
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A, B, nd C are incorrect. A is incorrect because boolean variables are used to store a literals with values of true or false. B is incorrect because the char data type is used to store a single Unicode character. C is incorrect because float is used to store floatingpoint numbers. 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 Answer:
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3 C . An int is used to store whole numbers and is a primitive. Primitive variables are faster to perform calculations than their associated wrapper class.
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A, B, nd D are incorrect. A is incorrect because a float is used for floating-point a numbers. B is incorrect because Float is a primitive wrapper class used for floatingpoint numbers. D is incorrect because the Integer data type is the wrapper class for an int. You can tell that it is not a primitive because the first letter is capitalized like all class names. Performing calculations with an Integer would be much slower than the primitive int.
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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 Answer:
3 A . A boolean primitive is used to store true or false which can be applied to a switch.
B, C, nd D are incorrect. They are all primitives used for different types of data. a 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 Answer:
3 C . A variable should begin with a lowercase letter, with each sequential word capitalized. The name should also be descriptive of what the variable is used for.
A, B, nd D are incorrect. a 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
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Answer:
3 A D. n enum or enumeration is used to store data that has the possibility to be one of a few predefined data types.
A, B, C, nd E are incorrect. A is incorrect because objects are used to store complex data a structures. B is incorrect because classes are used to create objects. C and E are incorrect because both are primitives and not suitable for this specific application. 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 Answer:
3 A . An Object data type is one that the developer can define to represent the system and its state in the application s code.
B, C, nd D are all incorrect because they are primitive types and cannot be defined to a hold complex data structures. 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[]
Answer:
3 , and F are correct. New is used to initialize any variable that is not a primitive. A, C, D
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