8.4.8
Examples of Method Declarations
CLASSES
8.4.8.1
Example: Overriding
In the example:
class Point {
int x = 0, y = 0;
void move(int dx, int dy) { x += dx; y += dy; }
}
class SlowPoint extends Point {
int xLimit, yLimit;
void move(int dx, int dy) {
super.move(limit(dx, xLimit), limit(dy, yLimit));
}
static int limit(int d, int limit) {
return d > limit ? limit : d <  limit ?  limit : d;
}
}
the class
SlowPoint
 overrides the declarations of method
move
 of class
Point
with its own
move
 method, which limits the distance that the point can move on
each invocation of the method. When the
move
 method is invoked for an instance
of class
SlowPoint
, the overriding definition in class
SlowPoint
 will always be
called, even if the reference to the
SlowPoint
 object is taken from a variable
whose type is
Point
.
8.4.8.2
Example: Overloading, Overriding, and Hiding
In the example:
class Point {
int x = 0, y = 0;
void move(int dx, int dy) { x += dx; y += dy; }
int color;
}
class RealPoint extends Point {
float x = 0.0f, y = 0.0f;
void move(int dx, int dy) { move((float)dx, (float)dy); }
void move(float dx, float dy) { x += dx; y += dy; }
}
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