1.對于Collection的數(shù)據(jù)宪赶，可以使用Collections工具獲取最大值和最小值。最大值和最小值的下標可以通過List的indexOf方法獲取。
2.對于Map的數(shù)據(jù)山宾，可以先將Map的value轉(zhuǎn)成Collection，然后通過Collections工具獲取最大值和最小值鳍徽。至于最大值和最小值的下標只能通過遍歷來獲取资锰。
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);
}
