从JSONObject获取Vector对象(Get Vector object from JSONObject)

 我想知道是否有办法从JSONObject中获取Vector。 假设我有这个： 
 
public class Foo
    private JSONObject json;
    public Foo(){
        try{ 
            json=new JSONObject();
            Vector<,F> v=new Vector<,F>(); // pretend like the comma isn't there please 
            json.put("blah", v); ...} catch (JSONException e){...}
    } 
    .
    .
    .
    public void addBlahs(,F goo){
         try{
            Object o=json.get("blah");
            // Since json.get("blah") should be a Vector of .F's, I thought I could do something like this...
            Vector<,F> v=(Vector <,F>) o;
            v.add(goo);} catch (JSONException{ ...}
    }
 
 Eclipse给出了一个警告，说明未经检查的类型转换。 是否可以从JSONObject获取某种类型的对象，然后能够使用该对象？ 我想在该Vector中添加“goo”，但不确定如何正确访问它并添加到它。 
 
 我是初学者，所以对我很轻松:) 

I am wondering if there is a way to get a Vector from out of a JSONObject. Let's say I have this :
 
public class Foo
    private JSONObject json;
    public Foo(){
        try{ 
            json=new JSONObject();
            Vector<,F> v=new Vector<,F>(); // pretend like the comma isn't there please 
            json.put("blah", v); ...} catch (JSONException e){...}
    } 
    .
    .
    .
    public void addBlahs(,F goo){
         try{
            Object o=json.get("blah");
            // Since json.get("blah") should be a Vector of .F's, I thought I could do something like this...
            Vector<,F> v=(Vector <,F>) o;
            v.add(goo);} catch (JSONException{ ...}
    }
 
Eclipse gives me a warning saying unchecked type cast. Is it possible to get a certain type of object from a JSONObject and then be able to use that object? I want to add "goo"s to that Vector, but not sure how to properly access it and add to it.
 
I'm a beginner so go easy on me :)

原文：https://stackoverflow.com/questions/12608472