Thread: Printing an arraylist of objects in JoptionPane?

Hello,

I'm writing a program to store my record collection. I'm struggling with a nice way to output the whole collection, however

relevant code, trying to use a stringbuilder:

	public static void printPlateSamling(){
		StringBuilder builder = new StringBuilder(platesamling.size());
		for(VinylPlate plate : platesamling){
			builder.append("\n");
		}
		//this doesn't work
		JOptionPane.showMessageDialog(null, builder.toString());
	}

Key: platesamling = arraylist of record objects
vinylplate = record object

Could anyone help me out with this?

Regards,
VikingCoder

Originally Posted by KevinWorkman

The only thing you ever append to the StringBuilder is a bunch of new lines. What did you expect to happen?

Hah, well, since I didn't exactly know what I was doing I was hoping for a miracle.

That's why I posted the question here. So, do you have a suggestion as to a way to print an arraylist of objects (containing strings, if this is relevant) with JOptionPane? (or a similarly nice-looking output)

Regards,
VikingCoder

when you are appending the builder variable, i notice you only apend the "\n" newline and nothing else. You need to append the record to the builder variable:
i.ei.
builder.append(plate."something");
builder.append("\n");
now I don't know how your record class is define, but if you want to append String, you need to have a string variable in your record class such as (String name)?

Originally Posted by retsameht

when you are appending the builder variable, i notice you only apend the "\n" newline and nothing else. You need to append the record to the builder variable:
i.ei.
builder.append(plate."something");
builder.append("\n");
now I don't know how your record class is define, but if you want to append String, you need to have a string variable in your record class such as (String name)?

thanks for your help brother i got it with this

new code:

	public static void printPlateSamling(){
 
		StringBuilder builder = new StringBuilder(platesamling.size());
		for(VinylPlate plate : platesamling){
			builder.append(plate.fullnavn + "\n");
		}
		//this now works :D
		JOptionPane.showMessageDialog(null, builder.toString());
 
	}

also this is my VinylPlate object

public class VinylPlate {
 
	public String artist;
	public String tittel;
	public String fullnavn;
 
	public String toString(){
		return this.fullnavn;
	}
 
}

I should have posted that earlier. Well, thanks for your help guys!

Kind regards,
VikingCoder