Help with collission

//first you have to import java.util.List;

//in your act method;
List<Actor> intersectingActors = getIntersectingObjects(Actor.class);//if you just want to check whether there is a specific class you can use this class instead of Actor;
if (!intersectingActors.isEmpty()) {
    for (Actor actor : intersectingActors) {
        actor.setRotation(directionToTurnTo(actor.getX(), actor.getY()));
    this.setRotation(directionToTurnTo(actor.getX(), actor.getY()) + 180);
    }
}

//also you need this methods:
    public int directionToTurnTo(int x, int y) {
        return direction(x - getX(), y - getY());
    }
    
    public int direction(int deltaX, int deltaY) {
        int direction;
        if(deltaX == 0 && deltaY == 0) {
            direction = 0;
        }
        else if(deltaX == 0 && deltaY < 0) {
            direction = -90;
        }
        else if(deltaX == 0 && deltaY > 0) {
            direction = 90;
        }
        else if(deltaX > 0 && deltaY == 0) {
            direction = 0;
        }
        else if(deltaX < 0 && deltaY == 0) {
            direction = 180;
        }
        else {
            int w = (int) Math.toDegrees(Math.atan((double)deltaY / (double)deltaX));
            if(deltaX > 0) {
                direction = w;
            }
            else {
                direction = 180 + w;
            }
        }
        return direction;
    }

List<Actor> intersectingActors = getObjectsInRange(getImage().getWidth()*2, Actor.class);