consider this inheritance of MyVector from MyPoint:
Code:
class MyPoint {
/* ... */
public MyPoint add(MyPoint other){ ... }
}
class MyVector extends MyPoint {
/* ... */
}
/* somewhere in the code */
MyVector v1 = new MyVector(...);
MyVector v2 = new MyVector(...);
MyVector v3 = v1.add(v2); // Error, cannot cast from