3 · Object-Oriented Core · lesson 12 of 41
Classes & Objects
State + behavior packaged together.
Java
public class Point {
double x, y; // fields (state)
double distance(Point other) { // method (behavior)
double dx = x - other.x, dy = y - other.y;
return Math.sqrt(dx*dx + dy*dy);
}
}
Point p = new Point(); // 'new' allocates on the heap
p.x = 3; p.y = 4;Loading 3D scene…
Key takeaways
- ✓A class is a blueprint; an object is one instance in memory.
- ✓'new' allocates a heap object and returns a reference.