/** Represents a 2-dimensional CSC142Point * @author CSC 142 * @version 2006 */ public class CSC142Point { private double x, y; // the coordinates // two different constructors /** * Create a CSC142Point at (0, 0) */ public CSC142Point() { x = 0; y = 0; } /** * Create a CSC142Point with the given coordinates * @param initialX the x-coordinate * @param initialY the y-coordinate */ public CSC142Point (double initialX, double initialY) { x = initialX; y = initialY; } // update (mutator) methods // that change the state of a CSC142Point object /** * Set the x-coordinate of this CSC142Point * @param updateX the new x-coordinate */ public void setX(double updateX) { x = updateX; } /** * Set the y-coordinate of this CSC142Point * @param newY the new y-coordinate */ public void setY(double updateY) { y = updateY; } /** * Set the x and y coordinates of this CSC142Point * @param newX the new x-coordinate * @param newY the new y-coordinate */ public void setPoint( double newX, double newY){ x = newX; y = newY; } // query (accessor) methods // that somehow report the state of a CSC142Point // without changing it /** * Get the x-coordinate of this CSC142Point * @return the x-coordinate */ public double getX() { return x; } /** * Get the y-coordinate of this CSC142Point * @return the y-coordinate */ public double getY() { return y; } /** * Calculate the distance between this CSC142Point and the origin * @return the distance to (0, 0) */ public double distanceToOrigin() { return Math.sqrt(x * x + y * y); } /** Calculate the distance between this CSC142Point and some other CSC142Point * @param other the other CSC142Point * @return the distance between the 2 CSC142Points */ public double distance(CSC142Point other) { double diffX = x - other.x; double diffY = y - other.y; return Math.sqrt(diffX * diffX + diffY * diffY); } /** * Find the midpoint between this CSC142Point and another CSC142Point * @param p the other CSC142Point * @return the CSC142Point midway between the two CSC142Points */ public CSC142Point midPoint(CSC142Point other) { double midX = (x + other.x) / 2; double midY = (y + other.y) / 2; return new CSC142Point(midX, midY); } /** * The String version of this CSC142Point * @return the String representation */ public String toString() { return "(" + x + ", " + y + ")"; } /** * a test method - do not change this code! * it should display 3 results in a terminal window */ public static void test (){ CSC142Point alpha = new CSC142Point( 5, 5 ); CSC142Point beta = new CSC142Point( -3, 7 ); System.out.println( "alpha is " + alpha.distanceToOrigin() + " from the origin" ); System.out.println( "The x coordinate of beta is " + beta.getX() ); beta.setY( 72 ); System.out.println( "The y coordinate of beta is " + beta.getY() ); } } 1)Which of the following is the name of an instance variable in the CSC142Point class provided in this samples above? 

a)

private

b)

double

c)

x

d)

xCoord

e)

Point

2) How many constructors are defined in the CSC142Point class provided in this examples above?

a) 3

b)

2

c) 1

d)

0

3) Which of the following is the name of a query method in the CSC142Point class in this examples above?

a)

Point

b)

double

c)

distance

d)

diffX

e)

public

4) Which of the following is the name of an update (mutator) method in the CSC142Point class in this examples above?

a) getX

b) setPoint

c) void

d)

public

e) newX

5) Which method in the CSC142Point class returns a reference to a new CSC142Point object?

a) setX()

b)

getX()

c) setPoint()

d)	midPoint()

e)	toString()