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Thread: Printing an arraylist of objects in JoptionPane?

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    Default 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


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    Default Re: Printing an arraylist of objects in JoptionPane?

    The only thing you ever append to the StringBuilder is a bunch of new lines. What did you expect to happen?
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    Default Re: Printing an arraylist of objects in JoptionPane?

    Quote Originally Posted by KevinWorkman View Post
    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

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    Default Re: Printing an arraylist of objects in JoptionPane?

    I would start out by simply printing out what you want to the command line using System.out.println(). What do you want to print out? What is the String representation of a VinylPlate?
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    Default Re: Printing an arraylist of objects in JoptionPane?

    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)?

  6. The Following User Says Thank You to retsameht For This Useful Post:

    VikingCoder (November 15th, 2012)

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    Default Re: Printing an arraylist of objects in JoptionPane?

    Quote Originally Posted by retsameht View Post
    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

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