java范型集合中的成员排序

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https://www.baiydu.com

范型集合中的类是JsonObject,不是自定义类，如果是自定义类就直接取要比较的字段值。

   ArrayList<JSONObject> TList = new ArrayList<JSONObject>();
 
                for(int i=0;i<10000;i++)
                 {
                     JSONObject object=new JSONObject();
                     Random rand = new Random();
                     int randNum = rand.nextInt(2000000)+5;
                     String Value=String.valueOf(randNum);
                     try {
                         object.put("value", Value);
                         object.put("name", "liaohang");
                     } catch (JSONException e) {
                         // TODO Auto-generated catch block
                         e.printStackTrace();
                     }
                     TList.add(object) ;
 
                 }
 
                  Collections.sort( TList, new Comparator<JSONObject>() {
                      //You can change "Name" with "ID" if you want to sort by ID
                      private static final String KEY_NAME = "value";
 
                      @Override
                      public int compare(JSONObject a, JSONObject b) {
                          int valA =0;
                          int valB =0;
 
                          try {
                              valA = Integer.parseInt((String) a.get(KEY_NAME));
                              valB = Integer.parseInt((String) b.get(KEY_NAME));
                          }
                          catch (JSONException e) {
                              //do something
                          }
                         return valA > valB ? 1 : -1;
 
                        //  return valA.compareTo(valB);
                          //if you want to change the sort order, simply use the following:
                          //return -valA.compareTo(valB);
                      }
                  });
 
                //打印排序后的结果
               String  printValue=null;
                 for(int i=0;i<TList.size();i++)
                 {
                   JSONObject obect=TList.get(i)  ;
                   try {
                        printValue=obect.getString("value");
                 } catch (JSONException e) {
                     // TODO Auto-generated catch block
                     e.printStackTrace();
                 }
 
                   System.out.println(printValue);
 
                 }