1.对于Collection的数据，可以使用Collections工具获取最大值和最小值。最大值和最小值的下标可以通过List的indexOf方法获取。
2.对于Map的数据，可以先将Map的value转成Collection，然后通过Collections工具获取最大值和最小值。至于最大值和最小值的下标只能通过遍历来获取。
private void getMaxAndMin()
{List<Integer> list = new ArrayList<>();list.add(1);list.add(2);list.add(3);list.add(4);list.add(5);Integer listMax = Collections.max(list);Integer listMin = Collections.min(list);Log.i("getMaxAndMin","listMax:"+listMax+" listMin:"+listMin);Log.i("getMaxAndMin","listMax index:"+list.indexOf(listMax)+" listMin index:"+list.indexOf(listMin));Map<Integer,Integer> map = new HashMap<>();map.put(0,1);map.put(1,2);map.put(2,3);map.put(3,4);map.put(4,5);Collection<Integer> collection = map.values();Integer mapMax = Collections.max(collection);Integer mapMin = Collections.min(collection);Log.i("getMaxAndMin","mapMax:"+mapMax+" mapMin:"+mapMin);Integer mapMaxIndex = null;Integer mapMinIndex = null;Set set = map.entrySet();Iterator iterator = set.iterator();while (iterator.hasNext()){Map.Entry entry = (Map.Entry) iterator.next();if (entry.getValue().equals(mapMax)) {mapMaxIndex = (Integer) entry.getKey();}if (entry.getValue().equals(mapMin)) {mapMinIndex = (Integer) entry.getKey();}}Log.i("getMaxAndMin","mapMaxIndex:"+mapMaxIndex+" mapMinIndex:"+mapMinIndex);
}