Question

I’ve got a problem with reading an object from file..

in main, I made eshop end call a method loadshop.

MyShop eshop = new MyShop();
eshop.loadShop("eshop.txt");

and also I’m getting the shop object from file.

@Override
public void loadShop(String filename) {

    try{
         ObjectInput out = new ObjectInputStream(new FileInputStream(filename));
         MyShop shop = (MyShop)out.readObject();
         out.close();

    } catch (Exception e) {
           e.printStackTrace();
    }
}

But I just can’t figure out how to assign “shop” to “eshop”

Thank you for any answer..:-) (Sorry for my English)

Answer 1

Just redesign, you don’t need to write

MyShop eshop = new MyShop();

Instead, write

MyShop eshop = MyShop.loadShop("eshop.txt");

and make the loadShop method static. And make it return the MyShop instance, if it isn’t already doing that.

If this is not an option, it is still better to get that instance through a hack than to write manual copying code:

public class MyShop {
  private MyShop readShop;

  public MyShop getReadShop() { return readShop; }

  public void loadShop(String fName) {
    try {
       ObjectInput out = new ObjectInputStream(new FileInputStream(filename));
       this.readShop = (MyShop)out.readObject();
       out.close();

    } catch (Exception e) {
      throw new RuntimeException(e);
    }
}

You’d use this like

MyShop tempShop = new MyShop();
tempShop.loadShop();
MyShop eshop = tempShop.getReadShop();