Development Assistance use voids from other class

in my signlistener class i want to run voids from both of my other classes, main and spleef.
the main one works but spleef doesnt...
my code to implement:

private Main main;
private Spleef spleef;


public SignListener(Main main,Spleef spleef) {
super();
this.main = main;
this.spleef = spleef;
}

bumpedy bump

EDIT by Moderator: merged posts, please use the edit button instead of double posting.