insert list values

 I am making an api call as shown in the code.

public class my_callout
{
   public String Output{get;set;}
   public List<WrapText> wrap{get;set;}
   public class WrapText
   {
      public Integer UserID{get;set;}
      public Integer ID{get;set;}
      public String Title{get;set;}
      public String Body{get;set;}  
      public WrapText(Integer u, Integer i,String t, String b)
      {
         UserID=u;
         ID=i;
         Title=t;
         Body=b;
      }
   }
   public void makeCall()  //making a request to the remote site and get an response.
   {
      HttpRequest req=new HttpRequest();
      req.setEndpoint('http://jsonplaceholder.typicode.com/posts');    //url of the request
      req.setMethod('GET'); 
      Http h = new Http();
      HttpResponse res=h.send(req);
      Output=res.getBody();  //will contain complete json body
       //now deserialize it
       wrap=(List<WrapText>)JSON.Deserialize(res.getBody(),List<WrapText>.class);
   }
}