The following two files form a very 
simple format representing the Java Compile Time Dependency Graph.
It was generated using the JDK 1.4.2 source and contains
only references to nodes inside the java.* packages,
in particular classes in javax.* are excluded.
The files are

* Nodes: 
     List of Classes explored and used for a set of Java core packages
* Edges: 
     Compile Time Dependencies between Classes.   
     No edges for dependencies outside the given Node list.
     Format: A -> B