What means the " E " in class Vector and " T " in class Class?

Hi world!
I was searching in the java docs and in the source code of Java and found a syntaxis that I don't know what mean. This:
public class Vector<E>
    extends AbstractList<E>
    implements List<E>, ...and this:
public Vector(Collection<? extends E> c)this too:
public final
    class Class<T> impleme...and that:
  public static Class<?> forName(String className) well you get the idea. If someone could give me where can I find information about the using of this.
Tanks

See the generics tutorial:
http://java.sun.com/j2se/1.5/pdf/generics-tutorial.pdf

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