总结：Collections可以对List进行排序；如果想对Map进行排序，可以将Map转化成List，进行排序；
public static void hashMapSortTest()
{
Map<String,
Integer> maps = new HashMap<String,
Integer>();
maps.put("boy",
8);
maps.put("cat",
7);
maps.put("dog",
1);
maps.put("apple",
5);
Iterator
i = maps.entrySet().iterator();
while (i.hasNext())
{
Map.Entry<String,
Integer> entry1 = (Map.Entry<String, Integer>) i.next();
}
List<Map.Entry<String,
Integer>> info = new ArrayList<Map.Entry<String,
Integer>>(maps.entrySet());
Collections.sort(info,
new Comparator<Map.Entry<String,
Integer>>() {
public int compare(Map.Entry<String,
Integer> obj1, Map.Entry<String, Integer> obj2) {
return obj1.getValue().compareTo(obj2.getValue());
}
});
}
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