• There are two main differences from C#:
  1. In C#, you can use the relational operators (<, <=, > and >=):

     tDay1<=tDay2
     

     This is not possible in Java 5. Instead you could write:

     tDay1.compareTo(tDay2)<=0
     

  2. In C#, it is not possible to declare constructors, fields and methods in an enum declaration.