calling parent class method from child class object in java

Question

I have a parent class which have a method  in child class i have override that parent class method   In a third class i make a object of child and by using that object i want call method of parent class Is it possible to call that parent class method   If yes then how   Please reply

User · Answer

Say the hierarchy is C- gt B- gt A with A being the base class   I think there s more to fixing this than renaming a method   That will work but is that a fix   One way is to refactor all the functionality common to B and C into D  and let B and C inherit from D    B C - gt D- gt A  Now the method in B that was hiding A s implementation from C is specific to B and stays there   This allows C to invoke the method in A without any hokery

User · Answer

Use the keyword super within the overridden method in the child class to use the parent class method  You can only use the keyword within the overridden method though  The example below will help   public class Parent       public int add int m  int n           return m n            public class Child extends Parent      public int add int m int n int o           return super add super add m  n  0              public class SimpleInheritanceTest       public static void main String   a           Child child   new Child            child add 10  11             The add method in the Child class calls super add to reuse the addition logic

User · Answer

NOTE calling parent method via super will only work on parent class  If your parent is interface  and wants to call the default methods then need to add interfaceName before super like IfscName super method     interface Vehicle         Non abstract method     public default void printVehicleTypeName       default keyword can be used only in interface          System out println  Vehicle              class FordFigo extends FordImpl implements Vehicle  Ford        Override     public void printVehicleTypeName              System out println  Figo            Vehicle super printVehicleTypeName              Interface name is needed because same default methods can be available in multiple interface name that this class extends  So explicit call to a method is required

User · Answer

If you override a parent method in its child  child objects will always use the overridden version  But  you can use the keyword super to call the parent method  inside the body of the child method   public class PolyTest      public static void main String args             new Child   foo             class Parent      public void foo            System out println  I m the parent              class Child extends Parent       Override     public void foo              super foo            System out println  I m the child               This would print      I m the child    Uncomment the commented line and it would print      I m the parent       I m the child    You should look for the concept of Polymorphism

User · Answer

First of all  it is a bad design  if you need something like that  it is good idea to refactor  e g  by renaming the method  Java allows calling of overriden method using the  super  keyword  but only one level up in the hierarchy  I am not sure  maybe Scala and some other JVM languages support it for any level

[java] calling parent class method from child class object in java

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