example:2:inheritance

  class college{

    String name;

    public college(String name){

        this.name=name;

    }

    public void student(){

        System.out.println("student learn in college");

    }

}

//child class

class Cr extends college{

    public Cr(String name){

        super(name);

    }

    public void student(){

        System.out.println(name + " is student of college");

    }

}

class teacher extends college {

    public teacher(String name) {

        super(name);

    }

    @Override

    public void student() {

        System.out.println(name + " is class teacher of saket college");

    }

}

public class firstprogramm {

    public static void main(String[] args) {

        Cr cr = new Cr("kuldeep");

        cr.student();

        teacher teacher= new teacher("shneha mam");

        teacher.student();

    }

}