$ javac BellmanFord.java RunBellmanFord.java
$ java RunBellmanFord <bfroute01.txt
6.0
$ java RunBellmanFord <bfroute02.txt
+infinite
$ java RunBellmanFord <bfroute03.txt
-infinite
$ java RunBellmanFord <bfroute04.txt
1.0