Why is my if statement an error?

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Your problem if statement isn’t in a function, it’s just sitting in the class. You need to move it into one of your methods. Try combining your move function and your collision check. 

void move() {
    if (x + xa > 0)
        x = x + xa;
    if (y + ya > 0)
        y = y + ya;
    }
    if (collision()){

    }
}

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