Java subclass inherits the shadowing of the parent class member variable, overriding the Implementation method

The hiding of member variables and the overriding of methods

Goods.java

 Public class Goods {    publicdouble  weight;      Public void oldsetweight (double  w) {       Weight=W;       System.out.println ("double type weight=" +weight);    }      Public Double Oldgetprice () {        double price = Weight*10;         return Price ;    }}

Cheapgoods.java

 public  class  cheapgoods extends   Goods { public     int   weight;  public  void  newsetweight (int   W) {weight  =W;    SYSTEM.OUT.PRINTLN ( "int weight=" +weight);  public  double   Newgetprice () { double  price = Weight*10;     return   price; }}

Example5_3.java

 Public classExample5_3 { Public Static voidMain (String args[]) {cheapgoods cheapgoods=NewCheapgoods (); //cheapgoods.weight=198.98 is illegal because the weight of the subclass object is already an int typeCheapgoods.newsetweight (198); System.out.println (The value of the weight of the object Cheapgoods is: "+cheapgoods.weight); System.out.println ("Cheapgoods to calculate the price with a subclass of the new offer method:" +Cheapgoods.newgetprice ()); Cheapgoods.oldsetweight (198.987);//The subclass object calls the inherited method operation to hide the double type variable weightSystem.out.println ("Cheapgoods uses inherited methods (no offers) to calculate price:" +Cheapgoods.oldgetprice ()); }  }

Subclass overrides for inheriting a parent class method

University.java

 Public class University {    void enterrule ( double math,double中文版, double Chinese) {        double total=math+english+Chinese;         if (total>=180)            System.out.println ("scores" +total+ "to reach the university's lowest admission line");         Else            System.out.println ("scores" +total+ "not meet the minimum admission line of the University");}    }

Importantuniversity.java

 Public class extends university{    void enterrule (double math,double中文版, double Chinese) {        double total=math+english+Chinese;         if (total>=220)             System.out.println ("scores" +total+ "to reach the key university admission Line");         Else            System.out.println ("scores" +total+ "failed to reach the key university admissions line");}    }

Example5_4.java

 Public classExample5_4 { Public Static voidMain (String args[]) {Doublemath=64,english=76.5,chinese=66; Importantuniversity Univer=Newimportantuniversity (); Univer.enterrule (Math,english,chinese); //calling the overridden methodmath=89; 中文版=80; Chinese=86; Univer=Newimportantuniversity (); Univer.enterrule (Math,english,chinese); //calling the overridden method    }}

Java subclass inherits the shadowing of the parent class member variable, overriding the Implementation method