Iterator<Object> iterator = set.iterator();
    while (iterator.hasNext()) {
        Object str = (Object)iterator.next();
        System.out.print(str+"\t");
    }

for (Object object : set) {
            System.out.print(object+"\t");
        }

        for (Object object : set) {
            if(object instanceof Integer) {
                int i = (Integer)object;
//              System.out.print(i+"\t");
            }else if(object instanceof String) {
                String str = (String)object;
                System.out.print(str+"\t");
            }
        }