public class Main extends AbstractScript {
    AnotherClass ac = new AnotherClass(this);
    public int onLoop() {
        ac.walk();
        return 100;
    }
}

public class AnotherClass {
    Main script;
    public AnotherClass(Main script) {
        this.script = script;
    }
    public void walk() {
        script.getWalking().walk(new Tile(0,0,0));
    }
}