Why am I getting java.util.ConcurrentModificationException?

Question

As I run the following code :

    import java.util.LinkedList;

    class Tester {
      public static void main(String args[]) {
        LinkedList

        

Answer 1

Because you are concurrently (simultaneously) modifying and iterating through a collection. Java doesn't like this

Since you don't actually use s, you can use a standard for loop

for(int i=0; i< list.size(); i++) {
      list.add(0,"art");
      list.remove(6);
      System.out.println(list);
}