Understanding Methods and Inheritance

Which of the following statements is true?

• Performing a task in a program requires a method.

• A method contains the statements that actually performs its task.

• The algorithm that the method represents can consist of a combination of sequencing, selection, and iteration.

• All of the above.

Which of the following statements is false?

• An object's attributes are specified in a class.

• A Student object would likely have a gpa attribute that represents the current GPA.

• Each Student object knows its GPA but not the GPA of other Student objects.

• Attributes are specified by the class's methods.

Fill in the blank. Inheritance represents a/an ___ relationship.

• has-a

• has-many

• is-a

• is-many

• None of the above.

Which of the following evaluates to false? I. true II. !true III. false IV. !false

• II only

• III only

• I and IV

• II and III

• III and IV

Consider the code segment below.

Which of the following initial conditions must be true for the code to run without error?

• The Painter object was facing east.

• The Painter object had paint.

• The Painter object could move forward.

• The Painter object does not have any paint.

• The Painter object started on paint.

Consider the following method header:

public boolean mystery()

How many arguments are needed when calling the mystery() method?

• o

• 1

• 2

• 3

• infinite

Consider the following code segment.

while(!myPainter.isFacingWest()) {

myPainter.turnLeft();

}

What is the most number of times that the turnLeft() method would be called?

• 0

• 2

• 3

• 4

• infinite