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);
                  
                }