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Authors:
Stuart Reges, Marty Stepp
Chapter:
Classes
Exercise:
Exercises
Question:2 | ISBN:9780136091813 | Edition: 2

Question

Add the following method to the Point class:
public boolean isVertical(Point other)
Returns true if the given Point lines up vertically with this Point, that is, if their x-coordinates are the same.

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Answer

Point Class
package classes;

public class Point {

    int x;
    int y;

    public int getX() {
        // TODO Auto-generated method stub
        return 0;
    }

    public int getY() {
        // TODO Auto-generated method stub
        return 0;
    }

    // this method returns true if their x coordinates are same
    public boolean isVertical(Point point) {
        boolean flag = this.x == point.x;
        return flag;
    }

}

Main class

package classes;

public class PointMain {

	public static void main(String[] args) {
		// create two Point objects
		Point p1 = new Point();
		p1.x = 7;
		p1.y = 2;

		Point p2 = new Point();
		p2.x = 4;
		p2.y = 3;

		PointMain pm = new PointMain();
		
		// print each point and its distance from the origin
		System.out.println("p1 is (" + p1.x + ", " + p1.y + ")");
		double dist1 = Math.sqrt(p1.x * p1.x + p1.y * p1.y);
		System.out.println("distance from origin = " + dist1);

		System.out.println("p2 is (" + p2.x + ", " + p2.y + ")");
		double dist2 = Math.sqrt(p2.x * p2.x + p2.y * p2.y);
		System.out.println("distance from origin = " + dist2);
		System.out.println();

		// translate each point to a new location
		p1.x += 11;
		p1.y += 6;
		p2.x += 14;
		p2.y += 7;
		// print the points again
		System.out.println("p1 is (" + p1.x + ", " + p1.y + ")");
		System.out.println("p2 is (" + p2.x + ", " + p2.y + ")");
		
		boolean flag = p1.isVertical(p2);
		System.out.println("\nare the x coordinates of p1 and p2 are same? " +flag);
		
	}
}
Output:

p1 is (7, 2)
distance from origin = 7.280109889280518
p2 is (4, 3)
distance from origin = 5.0

p1 is (18, 8)
p2 is (18, 10)

are the x coordinates of p1 and p2 are same? true

 

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