Implement LinkedList Java

import org.testng.annotations.Test;

class ListNode {
public int val;
public ListNode next;
public ListNode(int x) { val = x; }
}
public class LinkedList {
@Test
public void testInsert()
{

ListNode l1=new ListNode(2) ;
ListNode l2=new ListNode(1) ;
ListNode l3=new ListNode(3) ;
l1.next=l2;
l2.next=l3;
ListNode temp=l1;
while(temp!=null)
{
System.out.println(temp.val);
temp=temp.next;
}

}
}

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