Unit 4 - Conditions and Logic

The Scene class has different versions of the drawText() method.

void drawText(String text, int x, int y)

void drawText(String text, int x, int y, double rotation)

This is an example of

•  polymorphism

•  inheritance

• overloading

• subclass

• overriding

Assume dessert1 and dessert2 are object references. The following code segment is run, and returns true.

dessert1 == dessert2

What assumptions can be made about dessert1 and dessert2?

•  Either dessert1 or dessert2 must be null.

•  Both dessert1 and dessert2 must be null.

• dessert1 has an overridden equals method.

• dessert1 and dessert2 are aliases.

Consider the method to the left.

What is printed as a result of the call mystery(5, 9, 5)?

• XY

• XYZ

• Y

• YY

• Z

Consider the code segment to the left. Assume num is a properly declared and initialized int variable.

Which of the following best describes the result of executing the code segment?

• When num is a negative odd integer, "B" is printed; otherwise, "A" is printed.

• When num is a negative even integer, "B" is printed; otherwise, nothing is printed.

• When num is a positive even integer, "A" is printed; otherwise, "B" is printed.

• When num is a positive even integer, "A" is printed; when num is a positive odd integer, "B" is

  printed; otherwise, nothing is printed.

• When num is a positive odd integer, "A" is printed; when num is a positive even integer, "B" is

  printed; otherwise, nothing is printed.

Consider the code segment to the left.

What is printed as a result of executing the code segment?

• C

• O

• D

• E

• Nothing is printed

Consider the code to the left.

What is the value of y after the code segment is executed?

• 11

• 15

• 10

• 13

• 14

Which of the following best describes the Boolean expression shown below?

A || !(B && C)

• The resulting truth value is always true.

• The resulting truth value is always false.

• There are three instances where the resulting truth value is false.

• There is only one instance where the resulting truth value is false.

• The resulting truth value is true only when !C is true.

Which of the following methods would be best written as a static method?

• A method called getName in the Student class that accesses an individual student's name.

• A method called setName in the Student class that mutates an individual student's name.

• A method called Calculator in the Calculator class that initializes a new calculator.

• A method called convertTemp in the Calculator class that converts a Fahrenheit temperature to Celsius.

• A method called equals in the Student class that compares this student to another student

Consider a method called getNumStudents in the Student class which should be able to be called from a different class and returns the static variable numStudents. Which of the following is the best method header?

• public static void getNumStudents()

• public static int getNumStudents()

• private static int getNumStudents()

• public void getNumStudents()

• public int getNumStudents()

Consider the following method, which is intended to calculate and return the square root of the absolute value of a given double. 

public double figureItOut (double myDouble) {

           return /* missing code */

      }

Which of the following can replace /* missing code */ so the method will work as intended?

• Math .sqrt(Math.abs(myDouble));

• Math .sqrt(myDouble);

• Math .abs(myDouble);

• Math .abs(Math.sqrt(myDouble));

• -Math .sqrt(myDouble);