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How to write for loop: The for Statement (The Java™ Tutorials > Learning the Java Language > Language Basics)

Getting an element from an arraylist: Read the API doc for the ArrayList class to see...

What do you need help with?
the loop
getting an element from the arraylist
adding something to the textarea

Read the API doc for the JTextArea class to see how to use its constructors.

If you want to add the contents of an ArrayList to a text area, write a loop that gets the items from the arraylist...