Constructor Category:
Implicit constructor
When a class, not manually configured the preparation method , the system provides a default constructor with no arguments
Explicit Construction
When a class structure written in a manual method, the system does not provide a default constructor with no arguments
If the selected to delete, then there will be the following error: Because the constructor is not found
It is recommended that: When writing a manual configuration method, write your constructor with no arguments, then write the constructor needs
The case wrong reasons: the same number, the same type so in this case, when the number of the same type must be or else such as the one of the String class into other types
Overloaded constructor:
In the same class, the name must be the same method of construction, different parameter list (different numbers, different types, different order)