As "Stephan van Hulst" said Default Constructor existence is not a Compulsion for any Class.
If you don't have a Don't have a default Constructor in the Super class and you forget to insert a super(<with appropriate parameters>) inside every subclass you create then the compiler will Complain .
The following code will result in a Compiler Error :
"Implicit super Constructor A() undefined will be the error"
KARTHICK.C , SCJP6-93%
(Born to Win)
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