Names like "A", "Z" don't really matter. The same goes for "src0" - "src50".
But if this is really what you want, in a typical Java project it might look like this:
.../Project0/
|
+----/src/com/meff/a/
| |
| +-Src0.java
| +-Src1.java
| .
| .
| .
| +-Src50.java
|
+----/src/com/meff/b/
+-Src0.java
+-Src1.java
.
.
.
+-Src50.java
Again, such a naming scheme would be absolutely terrible. I just put it there, because this example you used, and it can help you organize your first project ...
Therefore, you should use directories to represent your packages (and by convention they should be lowercase). Your "parts" "A" through "Z" [sic] become "packages" "a" through "z".
Java- ( ).
, ( , "meff.com", ).
, "src0" " A" [sic] Src0.java, .../Project0/src/com/meff/a/ :
package com.meff.a;
public class Src0 {
...
}
, src/. , , , src/ ..
, " A Z" "src0 src50" - :)