public class Main {
    public static void main(String[] args) {
        Action delete = new Action("delete", 12);
        Action changeFont = new Action("changeFont", 0);
        Action bold  = new Action("bold", 1);

        ActionHistory actionHistory = new ActionHistory();
        System.out.println(actionHistory.isEmpty());
        actionHistory.push(delete);
        actionHistory.push(changeFont);
        System.out.println("+ 2 Items pushed");
        
        System.out.println(actionHistory.isEmpty());
        System.out.println(actionHistory.pop());
        System.out.println(actionHistory.pop());
        System.out.println("- 2 Items poped");
        actionHistory.pop();
        
        actionHistory.push(bold);
        System.out.println("+ 1 Item pushed");
        
        System.out.println(actionHistory.isEmpty());
        System.out.println("Action top: " + actionHistory.top());
        System.out.println(actionHistory.pop());
        System.out.println("- 1 Item poped");
        System.out.println(actionHistory.isEmpty());
        System.out.println("Action top: " + actionHistory.top());
    }
}