Writing an arraylist to a file. CHeck this out!

[carlos123]

Ok guys, check this out! Im getting an error "Error: Index: 0, Size: 0" not sure why.

 try{
    // Create file 
    FileWriter fstream = new FileWriter("database.txt");
        BufferedWriter out = new BufferedWriter(fstream);
 
        for( int i=0; i<firsta.size(); i++)
        {
 
    out.write("First Name: "+firsta.get(i));
    out.write("Last Name: "+lasta.get(i));
    out.write("Age: "+agea.get(i));
    out.write("Street Address: "+streeta.get(i));
    out.write("City Name: "+citya.get(i));
    out.write("State Name: "+statea.get(i));
    out.write("Year: "+yeara.get(i));
    out.write("Gender: "+gendera.get(i));
 
}
    //Close the output stream
    out.close();
    }catch (Exception e){//Catch exception if any
      System.out.println("Error: " + e.getMessage());
    }

[Ganon11]

Are you building firsta correctly? That error sounds like the program thinks there are no elements in firsta.

[carlos123]

does that look like the right way to add data to an arraylist?

firststring = first.getText();
            firsta.add(i,firststring);
            laststring = last.getText();
            lasta.add(i,laststring);
             try{
            agestring = age.getText();
            ageint = Integer.parseInt(agestring); 
             }catch (Exception e){//Catch exception if any
      System.out.println("Error: Numbers only....");
    }
            agea.add(i,ageint);
            streetstring = street.getText();
            streeta.add(i,streetstring);
            citystring = city.getText();
            citya.add(i,citystring);
            System.out.println(firsta.get(i));
            i++;
 

[dmjpro]

does that look like the right way to add data to an arraylist?

firststring = first.getText();
            firsta.add(i,firststring);
            laststring = last.getText();
            lasta.add(i,laststring);
             try{
            agestring = age.getText();
            ageint = Integer.parseInt(agestring); 
             }catch (Exception e){//Catch exception if any
      System.out.println("Error: Numbers only....");
    }
            agea.add(i,ageint);
            streetstring = street.getText();
            streeta.add(i,streetstring);
            citystring = city.getText();
            citya.add(i,citystring);
            System.out.println(firsta.get(i));
            i++;
 

You need not to have here index.
Because add simply add sequentially.
It seems your code is right.

Debasis Jana.

[dmjpro]

does that look like the right way to add data to an arraylist?

firststring = first.getText();
            firsta.add(i,firststring);
            laststring = last.getText();
            lasta.add(i,laststring);
             try{
            agestring = age.getText();
            ageint = Integer.parseInt(agestring); 
             }catch (Exception e){//Catch exception if any
      System.out.println("Error: Numbers only....");
    }
            agea.add(i,ageint);
            streetstring = street.getText();
            streeta.add(i,streetstring);
            citystring = city.getText();
            citya.add(i,citystring);
            System.out.println(firsta.get(i));
            i++;
 

And how do you write "ArrayList" in your "File"?
It seems something odd :-)
You can have a look at ObjectInutStrem and ObjectOutputStream
And if possible have a look after a Serializable

Enjoy your code.
Good Luck !

Debasis Jana

[JosAH]

Are you building firsta correctly? That error sounds like the program thinks there are no elements in firsta.

I think it's the other way around, i.e. firsta isn't empty while one of the other
array lists is empty.

kind regards,

Jos

[carlos123]

problem solved. thanks guys