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a. Local variable B. Static variable C. Global variable D. Method parameter e. Instance variable Answer: 3 . As calculations are performed on a variable, it should be stored as a local variable. In A this scenario, the variable is only needed for this one method. B, C, D , and E are incorrect. 4. What is the scope of a variable that is passed to a method a. Local variable B. Static variable C. Global variable D. Method parameter e. Instance variable Answer:
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3 D . Any variable that is passed to a method is a method parameter.
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A, B, C, nd E are incorrect. a 5. Two variables can have the same name in a method if the second is declared when the first is out of scope. a. True B. False Answer:
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3 A . Once a variable is out of scope, another variable can be declared with the same name.
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6. When a variable goes out of scope, it can never go back into scope. a. True B. False
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3 O A. nce a variable is out of scope, it can never come back into scope. Its value is lost and the Java Virtual Machine may reallocate the memory the variable occupies.
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7. When a variable is referenced with the this keyword, it is referring to the method parameter. a. True B. False Answer:
3 T B. he this keyword will reference the instance variable.
Constructing Methods
8. You need to create a method called findTotal. This method should take three arguments that are of type int. This method will return an int. Which of the following is the correct method declaration for this scenario a. int findTotal(int, int, int){ } B. findTotal(int num1, int num2, int num3) return int{ } C. int findTotal(int num1, int num2, int num3) return int{ } D. int findTotal(int num1, int num2, int num3) { } Answer:
3 D . A method declaration should be an optional modifier followed by the return data type, and then the method s name with a list of parameters. The parameters must be comma delimited and contain both their data type and name.
, B, and C are incorrect. A is incorrect because it is missing the names of the parameters. A B is incorrect because it is missing the return type and places an incorrect return after the parameter list. C is incorrect because it has an incorrect return after the parameter list. 9. A method needs to be created that accepts an array of floats as an argument and does not return any variables. The method should be called setPoints. Which of the following method declarations is correct a. setPoints(float[] points) { } B. void setPoints(float points) { }
Self Test answers
C. void setPoints(float[] points) { } D. float setPoints(float[] points) { } Answer:
3 C . void must be used for methods that do not return any data.
A, B,and D are incorrect. A is incorrect because it is missing the return type. If the method is not going to return a variable, it still must use void. B is incorrect because it does not have an array of floats as a parameter. D is incorrect because it uses the incorrect return type. 10. Objects are passed by __________. a. Value B. Reference Answer:
3 B . Objects are always passed to methods by reference. This means changes made to the object in the method will be reflected in the object in the code that invoked the method.
is incorrect. A 11. Primitives are passed by __________. a. Value B. Reference Answer:
3 A . Primitives are always passed to methods by value. This means that a copy is made and then given to the method. Changes made in the method will not affect the variable that was passed to the method.
is incorrect. B 12. When a method uses void to indicate it does not return a value, then a return statement is not required. a. True B. False
5:
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Answer:
3 A A. return statement is not needed if the method does not return a variable. However, one can be used.
13. Given the following class FloatNumber and method addHalf what is the output if the code segment is executed
public class FloatNumber { float number; public FloatNumber(float number) { this.number = number; } float getNumber() { return number; } void setNumber(float number) { this.number = number; } } void addHalf(FloatNumber value) { value.setNumber(value.getNumber() + (value.getNumber()/2f)); } /* CODE SEGMENT */ FloatNumber value = new FloatNumber(1f); addHalf(value); System.out.println("value = " + value.getNumber());
a. value = 1 B. value = 1.5 C. value = 2 D. value = 0 Answer:
3 T B. he FloatNumber object is passed by reference. Therefore, when the method changes its value, this change is still present when the code returns to the original calling code segment.
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