Map<Integer, Integer> map = new HashMap<Integer, Integer>();
Scanner sc = new Scanner(System.in);
int num = 0;
while (true) {
    System.out.printf("please input a number([0] to exit): "); 
    try {
        num = Integer.parseInt(sc.nextLine());
        if (num == 0) break;
    } catch (Exception e) {
        System.out.println("error input, input again.");
        continue;
    }
    if (map.containsKey(num)) {
        map.put(num, map.get(num)+1);
    } else {
        map.put(num, 1);
    }
}
List<Entry<Integer, Integer>> list = new ArrayList<Entry<Integer, Integer>>(map.entrySet());
Collections.sort(list, new Comparator<Entery<Integer, Integer>>() {
    compare(Entry<Integer, Integer> e1, Entry<Integer, Integer> e2) {
        return e2.getValue().compareTo(e1.getValue());
    }
});
int max = list.get(0).getValue();
for (EntrySet<Integer, Integer> e : list) {
    if (e.getValue() == max) {
        System.out.printf("num=%d, times=%d\n", e.getKey(), e.getValue());
    }
}