Inheritance

In Java, inheritance lets you take one blueprint and extend it to more complicated blueprints.

For example, here the Position class is extended to have three dimensions:

      public class Position3D extends Position {
        public int z;
        
        public Position3D (int x, int y, int z) {
          this.x = x;
          this.y = y;
          this.z = z;
        }
        public int getDimensonality () {
          return 3;
        }
      }