Linked list error

Question

Can anyone tell what's wrong with the following code?
It says arguments(int) is not supported, but I don't know what it means.
Thank you.
import java.util.*;
public class tester {
      * @param args
     public static void main(String[] args) {
          // TODO Auto-generated method stub
          LinkedList Customers = new LinkedList();
          for (int k=1;k<=5;k++)
               Customers.addLast(k);
          System.out.println(Customers);
          System.out.println(Customers.indexOf(3));
          Customers.removeFirst();
          System.out.println(Customers);
          System.out.println(Customers.indexOf(3));
          System.out.println(Math.random()*10);
}

Answer 1

What version of Java are you using? Collections can only hold objects, not primitives. In Java 5 (or was it 4) they introduced autoboxing which automatically "boxes" the primitive value into its wrapper class and then stores that in the Collection.