Java object-oriented basic three

1. Overloading of functions

2. Function of constructors

(constructors can be overloaded)

1. The function name must be the same as the class name

2. No return value

3. Use New to call the constructor

4. If there is no constructor in the class, the compiler will automatically help load a constructor with null argument and empty method body

5. If a constructor already exists in the class, the compiler will not be able to help generate the constructor.

Java object-oriented basic three