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Understanding Variable Scope and Class Construction
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1. What variable scope is best suited for a temporary variable a. Local variable B. Static variable C. Global variable D. Method parameter e. Instance variable 2. You need to create a class to store information about books contained in a library. What variable scope is best suited for the variable that will store the title of a book a. Local variable B. Static variable C. Global variable D. Method parameter e. Instance variable 3. You need to create a method that has two parameters to perform many complex steps and then return a result. What variable scope is best suited to store the value to be returned while calculations are carried out upon it a. Local variable B. Static variable C. Global variable D. Method parameter e. Instance variable 4. What is the scope of a variable that is passed to a method a. Local variable B. Static variable C. Global variable
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D. Method parameter e. Instance variable 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 6. When a variable goes out of scope, it can never go back into scope. a. True B. False 7. When a variable is referenced with the this keyword, it is referring to the method parameter. a. True B. False
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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) { } 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) { } C. void setPoints(float[] points) { } D. float setPoints(float[] points) { }
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10. Objects are passed by __________. a. Value B. Reference 11. Primitives are passed by __________. a. Value B. Reference 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 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
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C. value = 2 D. value = 0 14. Code that is after a return statement will be executed but cannot change the variable that is being returned. a. True B. False 15. Passing objects to a method is a good coding practice to use when you need to return more than one variable. a. True B. False
5:
Understanding Variable Scope and Class Construction
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Understanding Variable Scope
1. What variable scope is best suited for a temporary variable a. Local variable B. Static variable C. Global variable D. Method parameter e. Instance variable Answer:
3 A . A variable should also be declared using the least amount of scope. Since a temporary variable will normally only be used for a few lines of code, it should be declared as a local variable.
B, C, D, nd E are incorrect. a 2. You need to create a class to store information about books contained in a library. What variable scope is best suited for the variable that will store the title of a book a. Local variable B. Static variable C. Global variable D. Method parameter e. Instance variable Answer:
3 E. n a class that stores information about books, you would want to store the title of the I book in a variable that will remain in scope for the life of the object.
A, B, C, nd D are incorrect. a 3. You need to create a method that has two parameters to perform many complex steps and then return a result. What variable scope is best suited to store the value to be returned while calculations are carried out upon it
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