Arraylist变成JList问题

Question

I have trouble putting my arrayList into a Jlist . This is what I have:

Main Class:

  package domain;

 import java.util.ArrayList;

public static void main(String[] args) {
    ArrayList<String> purposeCategories = new ArrayList<String>();
    purposeCategories.add("Behavioral");
    purposeCategories.add("Structural");
    purposeCategories.add("Creational");
 }

I have put my list declaration in my Jframe class and I have the import domain.main; But it says that it doesn't recognize purposeCategories ...What am I forgetting?

 JList list_purpose = new JList(purposeCategories.toArray());
    list_purpose.setBounds(50, 121, 121, 63);
    contentPane.add(list_purpose);

Also sorry for my English and thank you for your time:D

Answer 1

The list is in a different scope. Do this in your Jframe class:

public MyFrame(List<String> data) {
//now put your code for the Jlist   here using the variable name "data" for your list
}