Java

OOP GUIDE / WORK

LINE CLASS SOLUTIONS

Topics

• Aggregation (with no encapsulation)

TASK – PART 1 & PART 2

No work

TASK – PART 3 – USING AGGREGATION

Here is my Line class that uses aggregation:

public class Line

{

public Point p1;

public Point p2;

public Line(double x1, double y1, double x2, double y2)

{

p1 = new Point(x1, y1);

p2 = new Point(x2, y2);

}

//We could add instance methods here...

}

TASK – PART 4 – TESTING THE LINE CLASS

Here is my Tester class:

public class LineTester

{

public static void main(String[] args)

{

Line l1 = new Line(3, 6, 2, 0);

System.out.println(l1.p1.x);

System.out.println(l1.p2.y);

l1.p1.y = 12;

}

}