i have prob in java particularly in package. i m unable to compile my program.?

[Rahul R]

my program have 1 packge. in d package ,there r 4 classes.suppose A,B,C,D. Class A is main class. Now,class B & C are used in class D. Class C &D are used in class B.Class B & C are used in class A. And class A & B are used in class C like dat..So, my prob is dat.....i have to compile all the classes but..there is error.Help