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In this lecture we are discussing:
#1 method overriding
#2 Necessary condition for method overriding
What is method Overriding?
It is way to override the parent class method in child class .
class Parent{
int a;
public void show{System.out.println("this is parent");}
}
class Child extends Parents{
int a=10; //override a
public void show(){System.out.println("this is child method");} //method override by child class
}
class Main{
public static void main(String []args){
Child c=new Child();
c.show(); //call the child class override method
}
}
-- method overriding is run time polymorphism
-- it is use to increase the reusability of code
#2
for a method to be overridden, the following conditions must be met:
-- The method in the subclass must have the same signature (name, number and type of parameters) as the method in the superclass.
-- The method in the subclass must have the same return type (or a subtype) as the method in the superclass.
-- The method in the subclass must have the same access level (public, protected, or private) as the method in the superclass.
-- The method in the subclass must not be static, while the method in the superclass must be marked as non-final.
-- The overridden method must be visible from the subclass it means you can change access modifiers but there is condition for
-- you need to increase visibility but you cannot reduced it , you can do it using access modifiers.
-- you can change access modifiers in this manner
private -default -protected -public (in upcoming lecture access modifiers has been discussed)
for knowing about access modifiers wait for access modifiers lecture in this playlist
class A{
void show(){ // -- by default access modifier is default
System.out.println("A");
}
int a=5;
}
class B extends A{
protected void show(){ //-- access modifier is protected --we can increase visibilty
System.out.println("B");
}
}
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