hi i have already got the code for the platform to move down but am not sure how to make it go up again... the code i already have is as follows:
public void act() 
    {
        setLocation(getX(), getY() + 4);
    }
   
   
            
private boolean down = true;
public void act() {
    if(getY() >= getWorld().getHeight()) {
        down = false;
    }
    else if(getY() <= 0) {
        down = true;
    }
    if(down) {
        setLocation(getX(), getY()+4);
    }
    else {
        setLocation (getX(), getY()-4);  
    }
}