Backward Hierarchy:
java.lang.Object -> Boo Foo

Backward References:
Boo in Foo occurrences = 1
Boo.m(0) in Foo occurrences = 1
Foo in Foo occurrences = 1
Foo.m(0) in Foo occurrences = 1
java.util.Collections in Foo occurrences = 3
java.util.Collections.emptyList(0) in Foo occurrences = 1
java.util.Collections.emptySet(0) in Foo occurrences = 1

Class Definitions:
Boo in Foo
Foo in Foo

Members Signatures: