java读取数据并创建对象

要求是：
java从txt文件中提取字符串的数据
然后根据特征分成两个类并且各自创建多个对象
提供的txt文档根据字母y或者n分为两类。
y类有6个属性 n类有9个属性
他们在同一个txt文档中且无法更改。

public static void main(String[] args) throws Exception{
    File file1 = new File("C:\\Users\\ASUS\\Desktop\\WEB\\Week1\\test1.txt");
    File file2 = new File("C:\\Users\\ASUS\\Desktop\\WEB\\Week1\\test2.txt");
    BufferedReader br1 = new BufferedReader(new FileReader(file1));
    BufferedReader br2 = new BufferedReader(new FileReader(file2));
    String s1 = null;
    String s2 = null;
    ArrayList<ArtPiece> Collection1 = new ArrayList<>();
    ArrayList<ArtPieceOnSale> Collection2 = new ArrayList<>();
    s1 = br1.readLine();
    s2 = br2.readLine();
    while ((s1 = br1.readLine()) != null) {
        if (s1.equals("n") || s1 != "y") {
            ArtPiece AP1 = new ArtPiece(s1 = br1.readLine(), s1 = br1.readLine(), s1 = br1.readLine(), s1 = br1.readLine(), transformtoInt(s1 = br1.readLine()));
            Collection1.add(AP1);
            System.out.println(AP1.getAuthor());
        }

        
    else if (s1.equals("y") || s1 != "n") {
            ArtPieceOnSale sale1 = new ArtPieceOnSale(s1 = br1.readLine(), s1 = br1.readLine(), s1 = br1.readLine(), s1 = br1.readLine(), transformtoInt(s1 = br1.readLine()), transformtoDouble(s1 = br1.readLine()), transformtoBoolean(s1 = br1.readLine()), s1 = br1.readLine());
            Collection2.add(sale1);
            System.out.println(sale1.getCode());
            
    }
    
    }
    
    


}


    public static  int transformtoInt(String s1) {
        s1 = s1.trim();
        int foo = Integer.parseInt(s1);
        return foo;    
    }
    public static double transformtoDouble(String s1) {
        Double d = Double.parseDouble(s1);
        return d;
    }
    public static boolean transformtoBoolean(String s1) {
        if (s1 == "Y") {
            return true;
        }else {
            return false;
        }
        
    }

}

只能写到这步。不知道怎么将他们分开并创建对象。求解答

先定义好2个类，一个对应y，一个对应n，读出来的内容，直接实例化到对应的对象即可。