OVERRIDING
whenever  method of parent class is implemented by  its child classes  used same type and argument that method called us overriden method and that process called overriding
example
  class Parent
{
   public void display()
 {
     System.out.println("display method is called");
  }
}
class Child
{
   // overriden method
public void display()
 {
     System.out.println("display method is called");

} 

NOTE
 1)modifier will change  with which have higher priorty  in overriden method 
like 
 
  class Parent
{
   protected void display()
 {
     System.out.println("display method is called");
  }
}
class Child
{
   // overriden method
public void display()
 {
     System.out.println("display method is called");

} 
 public> protected>default>private
 2) private type method is not overriden.
3) it is use runtime polymorphism .


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