what is the public

Answer 1

public keyword is a access modifier
when you declare a method property or variable public then it can be accessed outside it otherwise they will be accessed through the class only

Answer 2

Please describe your question more detailed.

Answer 3

what is the public ? define of

Answer 4

If you mean public in a method such as:
public void methodName (){}
Then public is simply a modifier that dictates which parts of your program can access that method, class, or whatever else public is "attached" to.

Answer 5

everyone can access ur variable/methods... , it is like free :D