exercises.md

অনুশীলন # ১

Design a class named Point which will model a 2D point with X and Y coordinates.

1. Two instance variable variables X (int) and X (int)
2. A "no-argument" (or "no-arg") constructor that construct a point at (0, 0).
3. A constructor that constructs a point with the given x and y coordinates.
4. Getter and setter for the instance variables x and y.
5. A method setXY() to set both x and y.
6. A toString() method that returns a string description of the instance in the format "(x, y)".
7. A method called distance(int x, int y) that returns the distance from this point to another point at the given (x, y) coordinates.
8. An overloaded distance(Point another) that returns the distance from this point to the given Point instance another.

For example -

package bd.com.howtocode.java;

/**
 * @author Bazlur Rahman Rokon
 * @date 6/19/15.
 */

public class Point {
    private int x;
    private int y;

    public Point() {
        x = 0;
        y = 0;
    }

    public Point(int x, int y) {
        this.x = x;
        this.y = y;
    }

    public int getX() {
        return x;
    }

    public void setX(int x) {
        this.x = x;
    }

    public int getY() {
        return y;
    }

    public void setY(int y) {
        this.y = y;
    }

    public double distance(int x, int y) {
        int xDiff = this.x - x;
        int yDiff = this.y - y;
        return Math.sqrt(xDiff * xDiff + yDiff * yDiff);
    }

    public double distance(Point p2) {
        return distance(p2.getX(), p2.getY());
    }

    @Override
    public String toString() {
        return "(" + x + ", " + ")";
    }
}

Now write a program that allocates 10 points in an array of Point, and initializes to (1, 1), (2, 2), ... (10, 10).