What's the difference between the following two Java lines?

I was given two of these line of code. What are the differences between two of these and which one is better for simple program.

public static < E > void swap(List< E > list, int i, int j);

vs

public static void swap(List<?> list, int i, int j);

>Solution :

public static < E > void swap(List< E > list, int i, int j);

Depends on generic class, sample

public class Test<E> {

  public <E> swap(List<E> list, int i, int j) {
    // your code
  }
}

public class ExtendTest<Person> {

  public Person swap(List<Person> list, int i, int j) {
    // your code
  }
}

public static void swap(List<?> list, int i, int j);

Can use with non-generic class, sample:

public class Test {

  public List<?> swap(List<?> list, int i, int j) {
    // your code
  }
}