Given the class \'Point\' which has two member variables x, and y. What will the

Question

Given the class 'Point' which has two member variables x, and y. What will the output of the first "System.out.println" statement in the main method ?

True

False

Won't print anything

Error

True

False

Won't print anything

Error

public class Point f private int x; private int y; public void setX(int x) this.x -x; public void setY(int y) this.yey; public void setXY(int x, int y,) x-y; public boolean IsEqual (Point p) public void DisplayPoint() System.out.println("("+x "," + y ")"); public void movePoint(int deltax, int deltay) (// 'x' is increased by deltax and y is increased by deltay public void SetLocation (Point P) (//make point to have the specified location P. public static void main(String[] args) t /I TODO Auto-generated method stub Point P1 new Point(); Point P2 -new Point(); P1.setx(5); P1.setY (6); P2.setx(5); P2.setY (6); System.out.println(P1.IsEqual(P2)); P2.setXY(3,4); System.out.println(P1.IsEqual(P2));

Explanation / Answer

Answer : (D)

The variables x and y are private to the class. Now, in the function IsEqual(), we are accessing the variables x and y directly i.e:

p.x

p.y

So, it will cause an error as they are not public.

In order to correctly run the code, we can create method

getX()

and

getY()

which return the values of x and y and then modify the IsEqual function like

public boolean IsEqual(Point p)

{

  return ( ( p.getX() == x ) && ( p.getY() == y ) );

}

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