Write a program to Overriding in java?

Here I am taking class A:

package com.oops;

class A{
void msg(){
System.out.println("Hello");
}
}

Here I am taking class B:

class B extends A{
void msg(){
System.out.println("Welcome");
}
 
 public static void main(String args[]){
 A a=new A();
         B b=new B();
        A obj=new B();
     
        System.out.println(a.msg());   //   Hello
        System.out.println(obj.msg());  // Welcome
        System.out.println(b.msg());   //Welcome
}
}



Output:
Hello
Welcome
Welcome