1、普通的int或者double類型
public class ListMapSort {
public static void main(String[] args) {
List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
Map<String, Object> map1 = new HashMap<String, Object>();
map1.put("name", "張三");
map1.put("age", "18");
Map<String, Object> map2 = new HashMap<String, Object>();
map2.put("name", "李四");
map2.put("age", "20");
Map<String, Object> map3 = new HashMap<String, Object>();
map3.put("name", "王五");
map3.put("age", "5");
list.add(map1);
list.add(map3);
list.add(map2);
//排序前
for (Map<String, Object> map : list) {
System.out.println(map.get("age"));
}
Collections.sort(list, new Comparator<Map<String, Object>>() {
public int compare(Map<String, Object> o1, Map<String, Object> o2) {
Integer name1 = Integer.valueOf(o1.get("cj").toString()) ;
Integer name2 = Integer.valueOf(o2.get("cj").toString()) ;
return name1.compareTo(name2);
}
});
//排序后
System.out.println("-------------------");
System.out.println("-------------------");
System.out.println("-------------------");
for (Map<String, Object> map : list) {
System.out.println(map.get("age"));
}
}
}
坛梁！注：如果age的value是double類型的聋庵，在compare要使用double類型接收膘融。
2、中文字符串首字母排序
public static void main(String[] args) {
// TODO Auto-generated method stub
Comparator<Object> com=Collator.getInstance(java.util.Locale.CHINA);
String[] newArray={"三眼塘","沅江","益陽","回龍村","長沙","寧鄉(xiāng)","星沙","安沙","深圳","北京"};
List<String> list = Arrays.asList(newArray);
Collections.sort(list, com);
for(String i:list){
System.out.print(i+" ");
}
}
