Sample Java Façade

Application.java

interface SolidObject {
    void applyGravity();
    void colide(SolidObject other);
}

interface MovingObject {
    void run();
    void stop();
}

....

class Car {

    SolidObject solidObject;

    MovingObject movingObject;

    void go() {
        solidObject.applyGravity();
        movingObject.run();
    }

    void crash(Car other) {
        movingObject.stop();
        solidObject.colide(other.solidObject);
        other.crash(this);
    }

}