java List<Item> its=new ArrayList<Item>(); Map按value中的某字段排序
public List<Item> getAllItem(){
Map<Long, Item> itemDic = new HashMap<Long, Item>();
List<Map.Entry<Long, Item>> entryList = new ArrayList<Map.Entry<Long, Item>>(itemDic.entrySet());
if(entryList.size()>0){
List<Item> its=new ArrayList<Item>();
Collections.sort(entryList, new Comparator<Map.Entry<Long, Item>>() {
public int compare(Map.Entry<Long, Item> it1, Map.Entry<Long, Item> it2) {
return (it1.getValue().getType() - it2.getValue().getType());//根据value排序
}
});
for (int i = 0; i < entryList.size(); i++) {
its.add(itemDic.get(entryList.get(i).getKey()));
}
System.out.println("按类型排序:>>>>>00"+its);
return its;
}
return null;
}