import java.util.*;
public class LinkedListExplore5 {
    final static int m = 80000;
    public static void main(String[] args) {
        List<String> s = new LinkedList<String>();
        for (int i = 0; i < m; i++) {
            s.add(UUID.randomUUID().toString());
        }
        System.out.println("t0="+System.currentTimeMillis());
        // s.get(12000);
        for (int i = 0; i < m; i++) {
            s.get(i);
        }
        System.out.println("t1="+System.currentTimeMillis());
    }
}

import java.util.*;
public class LinkedListExplore5 {
    final static int m = 80000;
    public static void main(String[] args) {
        List<String> s = new LinkedList<String>();
        ListIterator<String> k = s.listIterator();
        for (int i = 0; i < m; i++) {
            s.add(UUID.randomUUID().toString());
        }
        System.out.println("t0="+System.currentTimeMillis());
        s.get(34567);
//        for (int i = 0; i < m; i++) {
//            s.get(i);
//        }
        System.out.println("t1="+System.currentTimeMillis());
    }
}

import java.util.*;
public class LinkedListExplore4 {
    public static void main(String[] args) {
        List<String> s = new LinkedList<String>();
        Iterator<String> si = s.iterator();
        s.add("Adam");
        s.add("Bob");
        s.add("Carl");

        //si = s.iterator();
        while (si.hasNext()) {
            si.next();
        }
        
        System.out.println(s);
    }
}

Exception in thread "main" java.util.ConcurrentModificationException
	at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:761)
	at java.util.LinkedList$ListItr.next(LinkedList.java:696)
	at LinkedListExplore4.main(LinkedListExplore4.java:12)
Java Result: 1