How can we add elements to component at run time  through java

Hi,
In my project ,I am using JArrayList to collect urls and I need to add those to JScrollPane(JTextArea) and this to frame. This works fine but I need the process of how the elements added to ArrayList simultaneusly added to JTextArea.
pls suggest the way

arrayList.add( someObject );
textArea.append( someObject.toString() );

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