frog$ cat -n T.java
     1 class A {
     2 private class T {};
     3 static T[] a = null;
     4 }
     5
     6 class B {
     7 int n = A.a.length;
     8 }
frog$ javac1.4 T.java
+ /usr/local/java/jdk1.4.0/solsparc/bin/javac T.java
T.java:7: length in Array is not defined in a public class or interface; cannot be accessed from outside package
    int n = A.a.length;
               ^
1 error
frog$