DouKaku?

bash.exe -c "diff -u old/Count13Friday.java Count13Friday.java"
--- old/Count13Friday.java      2008-08-06 18:51:31.343750000 +0900
+++ Count13Friday.java  2008-08-06 18:49:00.625000000 +0900
@@ -22,6 +22,7 @@
             current.add(MONTH, 1);
         }
         System.out.println("Fridays = " + fridays);
+        System.out.println("Fridays count = " + fridays.size());
     }

 }