AP CS - Unit 5 Review

What is a mutator ?

• An instance method that modifies the object’s internal state.

• An instance method that provides information about the state of an object, without modifying it.

• Code that interacts with another class or objects of that class.

• The parent class in an inheritance relationship.

• Hiding the implementation details of an object from the clients of the object, usually using the private keyword.

2. What is encapsulation ?

• An instance method that modifies the object’s internal state.

• An instance method that provides information about the state of an object, without modifying it.

• Code that interacts with another class or objects of that class

• The parent class in an inheritance relationship

• Hiding the implementation details of an object from the clients of the object, usually using the private keyword.

What is an accessor ?

• An instance method that modifies the object’s internal state.

• An instance method that provides information about the state of an object, without modifying it.

• Code that interacts with another class or objects of that class

• The parent class in an inheritance relationship

• Hiding the implementation details of an object from the clients of the object, usually using the private keyword.

What is a client (also called client code) ?

• An instance method that modifies the object’s internal state.

• An instance method that provides information about the state of an object, without modifying it.

• Code that interacts with another class or objects of that class

• The parent class in an inheritance relationship

• Hiding the implementation details of an object from the clients of the object, usually using the private keyword.

• true

• false

• x == y

• x != y

• (x <= y) && (x >= y)

• 7 8 8

• 0 8 8

• 0 0 8

• 0 0 0

• I only

• II only

• III only

• I and II

• I, II, and III

Which of the following would be the best specification (method header) for a new LineSegment method named distanceToPoint that calculates the shortest distance from the point to the LineSegment ?

• public double distanceToPoint()

• public void distanceToPoint(Point p, double d)

• public double distanceToPoint(Point p)

• public void distanceToPoint()

• public double distanceToPoint(Point p, Point start, Point end)

In a Java program which of the following correctly declares and initializes an object LineSegment seg from the coordinates (1.0, 2.0) to (5.0, 6.0) ?

• LineSegment seg = new LineSegment();

  seg.start = new Point(1.0, 2.0);

  seg.end = new Point(5.0, 6.0);

• LineSegment seg = new LineSegment();

  seg.start = new Point();

  seg.start.myX = 1.0;

  seg.start.myY = 2.0;

  seg.end = new Point();

  seg.end.myX = 5.0;

  seg.end.myY = 6.0;

• LineSegment seg =

  new LineSegment(1.0, 2.0, 5.0, 6.0);

• LineSegment seg =

  new LineSegment((1.0, 2.0), (5.0, 6.0));

• Point p1 = new Point(1.0, 2.0);

  Point p2 = new Point(5.0, 6.0);

  LineSegment seg = new LineSegment(p1, p2);

• I only

• II only

• III only

• II and III only

• I, II, and III