Write a program that used to override the superclass called add () method in Addition to this method without substantial
Operation, the output only one message, the add () method in NumberAddition class two integer addition,
While in TextConcatenation type connecting two String String, create two subclasses of the main class test
The add () method,

CodePudding user response:

Go baidu,,,

CodePudding user response:

Why have this kind of operation, the feeling is not clear,