Classes and objects, methods and encapsulation

Use of variable length parameters ： Note that the list of formal parameters of a method can use at most one variable length parameter , And the parameter is placed at the end ;

void setName(String...args){
    for(int i = 0;i<args.length();i++){
        System.out.println(args[]);
    }
}

Parameter passing ：

Parameter is the parameter of method declaration , Arguments are parameters of method calls ;

Construction method ： When there is no constructor in the class , It will call the parameterless constructor by default , But when there is a constructor in a class , Cannot call default parameterless constructor ;

heavy load ： The number of parameter types is different , Independent of return value and parameter name ;

this： Represent the object being constructed in the construction method , Represent the variable being called in the member method ; Accessing member variables in constructor and member methods , The compiler will add... By default this keyword ;

When the local variable name is the same as the member variable name , Local variables are preferred , If you want to use member variables , Should be added before the member variable this. Prefix , Make sure that the variable is a member variable ;

Encapsulate how to implement ： Set the property to private, And write the corresponding get、set Method , stay set Method to implement restrictions on attributes , Note that public Of , Implement encapsulation of attributes ;