First of all you are not creating a JList. It should be JList jlist001; while you declare a variable not with new. While you have no variable JLIST001 in your Code you can not instance a new object from it. Before you would have to declare like I wrote and after it you could do an instancing:
package com.company;
import javax.swing.*;
public class Main {
public static void main(String[] args) {
JList jlist001;
jlist001 = new JList();
}
}
In this Form you would have an Object jlist001 which is a new Object instance.