method override java

class BaseClass {
    private void notOverride() // private methods are not overridden
    {        System.out.println("From parent m1()"); }
  
    public void methodToOverride()
    {
        System.out.println("From the base class");
    }
}
  
class DerivedClass extends BaseClass {
    @Override // overriding method
    public void methodToOverride()
    {
        System.out.println("From the derived class");
    }
}
  
class Main {
    public static void main(String[] args)
    {
        var obj1 = new BaseClass();
        obj1.methodToOverride(); // the base class method
        var obj2 = new DerivedClass();
        obj2.methodToOverride(); // the overriden derived class method
    }
}// A Simple Java program to demonstrate
// Overriding and Access-Modifiers
  
class Parent {
    // private methods are not overridden
    private void m1()
    {
        System.out.println("From parent m1()");
    }
  
    protected void m2()
    {
        System.out.println("From parent m2()");
    }
}
  
class Child extends Parent {
    // new m1() method
    // unique to Child class
    private void m1()
    {
        System.out.println("From child m1()");
    }
  
    // overriding method
    // with more accessibility
    @Override
    public void m2()
    {
        System.out.println("From child m2()");
    }
}
  
// Driver class
class Main {
    public static void main(String[] args)
    {
        Parent obj1 = new Parent();
        obj1.m2();
        Parent obj2 = new Child();
        obj2.m2();
    }
}class Animal {
   public void displayInfo() {
      System.out.println("I am an animal.");
   }
}

class Dog extends Animal {
   @Override
   public void displayInfo() {
      System.out.println("I am a dog.");
   }
}

class Main {
   public static void main(String[] args) {
      Dog d1 = new Dog();
      d1.displayInfo();
   }
}// A Simple Java program to demonstrate
// Overriding and Access-Modifiers
  
class Parent {
    // private methods are not overridden
    private void m1()
    {
        System.out.println("From parent m1()");
    }
  
    protected void m2()
    {
        System.out.println("From parent m2()");
    }
}
  
class Child extends Parent {
    // new m1() method
    // unique to Child class
    private void m1()
    {
        System.out.println("From child m1()");
    }
  
    // overriding method
    // with more accessibility
    @Override
    public void m2()
    {
        System.out.println("From child m2()");
    }
}
  
// Driver class
class Main {
    public static void main(String[] args)
    {
        Parent obj1 = new Parent();
        obj1.m2();
        Parent obj2 = new Child();
        obj2.m2();
    }
}// A Simple Java program to demonstrate
// method overriding in java
  
// Base Class
class Parent {
    void show()
    {
        System.out.println("Parent's show()");
    }
}
  
// Inherited class
class Child extends Parent {
    // This method overrides show() of Parent
    @Override
    void show()
    {
        System.out.println("Child's show()");
    }
}
  
// Driver class
class Main {
    public static void main(String[] args)
    {
        // If a Parent type reference refers
        // to a Parent object, then Parent's
        // show is called
        Parent obj1 = new Parent();
        obj1.show();
  
        // If a Parent type reference refers
        // to a Child object Child's show()
        // is called. This is called RUN TIME
        // POLYMORPHISM.
        Parent obj2 = new Child();
        obj2.show();
    }
}using method-override in your index.js
1. npm install method-override --save
2. var methodOverride = require("method-override");
3. app.use(methodOverride("_method"));
//'_method' is what methodOverride will look for
method override in your UPDATE route: 
* <form action = "/campgrounds/<%=campground._id%>/edit?_method=PUT" 
	method = "POST">
and EDIT routes: 
public class Multi{ //Super class
public void multi(){
………………
}
}
 
Public class Multiplication extends Multi(){
Public void multi(){
………..
}
Public static void main(String args[]){
Multi multiplication = new Multiplication(); //Polimorphism is applied
multiplication.multi(); // It calls the Sub class add() method
}
}Overriding means same method name and same parameter, 
occur in different class that has 
inheritance relationship. 
we use method overriding to implement 
specific functionality to the method. Method Overloading: 
Access modifier can be same or different, 
Return-Type can be same or different, 
Parameters MUST be different, Method name MUST be same, 
any method can be overloaded

Method Overriding:
After a method is inherited it is possible to change 
the implantation of the method in the child class. 
This concept is called overriding. 
Method name, Parameter, and Return-Type MUST be same
access modifier MUST be same or more visible, 
MUST happen in the sub class, 
ONLY the instance methods can be overridden
@Override annotation MUST be applicable. 
Static and Constructor cannot be override.
We can use the @Override annotation before the method 
to declare the overriding.
EXAMPLE: get method WebDriver driver = new ChromeDriver(); 
driver.get("URL") ==> opens the url from chrome