Source of Line.java

Structures and functions

public class Line

  1: //Line.java
  2: //Illustrates an "inner class".
  3: //Note the files produced upon compilation.

  5: public class Line
  6: {
  7:     private class Point
  8:     {
  9:         int x;
 10:         int y;

 12:         Point() { x=0; y=0; }
 13:         Point(int x, int y)
 14:         {
 15:             this.x = x;
 16:             this.y = y;
 17:         }
 18:     }

 20:     private Point start;
 21:     private Point end;


 24:     public double length()
 25:     {
 26:         return Math.sqrt((end.x-start.x) * (end.x-start.x) +
 27:                          (end.y-start.y) * (end.y-start.y));
 28:     }

 30:     public Line()
 31:     {
 32:         start = new Point();
 33:         end   = new Point();
 34:     }

 36:     public Line(int p1x, int p1y, int p2x, int p2y)
 37:     {
 38:         start = new Point(p1x, p1y);
 39:         end   = new Point(p2x, p2y);
 40:     }

 42: }