Main2.java

class Main2{
    public static void main(String args[]){
        base obj = new der();
        obj.myMethod();
        obj.myNewMethod();
    }
}

class base{
    public void myMethod(){
        System.out.println("Method from Base");
    }
}

class der extends base{
    public void myNewMethod(){
        System.out.println("Method from Der");
    }
}


/*
///////////////////////////////
D:\inp>javac Main2.java
Main2.java:5: error: cannot find symbol
        obj.myNewMethod();
           ^
  symbol:   method myNewMethod()
  location: variable obj of type base
1 error
////////////////////////////////////
*/