将在ArrayList中创建的对象传递给另一个类的另一个方法

Question

I have a class named AirMain where I took in inputs from the user of airline information. I have another class named Airline where constructors are created to store the user input as as Airline object which then store into ArrayList named "info".

I have another ArrayList named "query" storing objects from Airline class but different parameter from the "info" ArrayList.

When I tried to pass both of these ArrayList to another class method (named earliestDepart() in Airline class), I receive error "Cannot find symbol; location: class Object". It is quite a lengthy code, so please see below for a snapshot of the passing to other method of another class and the point where error happens.

Please advise me how do I pass Arraylist containing of objects to another class for process. Thanks in advance!

Code in AirMain Class

ArrayList <Airline> info = new ArrayList<Airline>();
ArrayList <Airline> query = new ArrayList<Airline>();
Airline createAirline = new Airline (fromCity, toCity, departTime, arriveTime, cost);
info.add(createAirline);
Airline createQuery = new Airline(type, fromCity, toCity);
query.add(createQuery);
if (query.get(i).getType() == 1) { query.get(i).earliestDepart(info);  }//end of if type 1

Code in Airline Class

public void earliestDepart(ArrayList info){
String retrieve = info.get(i).getFromCity();//error kicks into this statement 
}

Answer 1

You need to modify the info argument in your earliestDepart() method like this:

public void earliestDepart(List<Airline> info){
String retrieve = info.get(i).getFromCity();//error kicks into this statement 
}

Answer 2

将值传递给earliestDepart方法。

public void earliestDepart(List<Airline> infoList){...}