Java Note 14 private

Private
1 is a permission modifier
2 You can modify member variables and member methods
Members that are modified by them can only be accessed in this class

1 classDemo {2     //int num = ten;3     //Decorate with private4     Private intnum = 10;5     6      Public voidShow () {7 System.out.println (num);8     }9     Ten     Private voidmethod () { OneSystem.out.println ("Method"); A     } -      -      Public voidfunction () { the method (); -     } - } -  + classPrivatedemo { -      Public Static voidMain (string[] args) { +Demo d =NewDemo (); A         //cannot method private member variable at         //System.out.println (d.num); - d.show (); -         //the private member method cannot be accessed -         //D.method (); - d.function (); -     } in}

Applications for encapsulation and private:
A: Modify the member variable with private
B: Improve the corresponding getxxx () and setxxx () methods

1 classStudent {2     //name3     PrivateString name;4     //Age5     Private intAge ;6     7     //Name Get value8      PublicString GetName () {9         returnname;Ten     } One      A     //Name Setting Value -      Public voidSetName (String N) { -Name =N; the     } -      -     //Age Get Value -      Public intGetage () { +         returnAge ; -     } +      A     //age-assigned value at      Public voidSetage (inta) { -Age =A; -     } - } -  - //Test Class in classStudenttest { -      Public Static voidMain (string[] args) { to         //Create student Objects +Student s =NewStudent (); -          the         //using member variables *         //Error: The private decoration, the outside world can not directly access the $         //System.out.println (s.name+ "---" +s.age);Panax NotoginsengSystem.out.println (S.getname () + "---" +s.getage ()); -          the         //Assigning a value to a member variable +         //s.name = "Brigitte"; A         //s.age =; the         //assigning values by method +S.setname ("Brigitte"); -S.setage (27); $System.out.println (S.getname () + "---" +s.getage ()); $     } -}

Java Note 14 private