Access Specifiers Public Private Protected and Static ,Non static member function and member variable in Java

import java.io.*;

class student {

    static int count;//Does not Require initialization.
    int count1 = 0;//Non Static Member Variable must to be initialized

    student() {
        acc_details();//Accessed only within the class
    }

    public static void stu_details()//static method can be called without the object
    {
        System.out.println("Name:XXXX");
        System.out.println("Roll No:123456");
        count++;
        //count1++;here it cannot be used because non static member could not be used in the static function
    }

    private void acc_details()//non static method can be called only with the object
    {
        System.out.println("Entered into Private Access Specifiers");
        System.out.println("Password:*******");
        count++;
        count1++;
    }

    protected void att_details()//non static method can be called only with the object
    {
        System.out.println("Attendance Details");
        count++;
        count1++;

    }
}

class staff extends student {

    protected static void sta_details()//static method can be called without the object
    {
        count++;
        //count1++;here it cannot be used because non static member could not be used in the static function
        System.out.println("Name:YYYY");

    }
}

class hod extends staff {

    protected static void hod_details()//static method can be called without the object
    {
        count++;

        //count1++;here it cannot be used because non static member could not be used in the static function

        System.out.println("Name:ZZZ");

    }
}

class college extends hod {

    public static void main(String a[]) {


        stu_details();//College can view the student details because it is in public mode 
        /*
         * static method can be called without the object .If you didnt specify
         * as static during the declaration of this function you will get an
         * error message during the calling of this function
         */

        sta_details();//College can view the staff details because it is in public mode
        /*
         * static method can be called without the object .If you didnt specify
         * as static during the declaration of this function you will get an
         * error message during the calling of this function
         */

        hod_details();//College can view the hod details because it is in public mode
        /*
         * static method can be called without the object .If you didnt specify
         * as static during the declaration of this function you will get an
         * error message during the calling of this function
         */


        staff s1 = new staff();
        s1.stu_details();//staff can also view the student details because it is in public mode


        hod s2 = new hod();
        s2.stu_details();//hod can also view the student details because it is in public mode

        s1.att_details();//staff can also view the student attendance details because it is inherited so it has an access over protected details.


        s2.att_details();//staff can also view the student attendance details because it is inherited so it has an access over protected details.


        //acc_details() cannot not be viewed by any of the classes like staff,hod and college becuase it is in private mode.
        student s = new student();
        //s.acc_details(); it cannot be called because private mode function only accessed within the function.
        s.stu_details();
        s.att_details();

        System.out.println("Count value without object:" + count);//count variable can be called without an object
        //System.out.println("Count1 Value:" + count1); count1 variable cannot be called without an object because it is non-static
        System.out.println("Count value with object of class student:" + s.count);
        System.out.println("Count value with object of class staff:" + s1.count);
        System.out.println("Count value with object of class hod:" + s2.count);
        System.out.println("Count1 value with object of class student:" + s.count1);
        System.out.println("Count1 value with object of class staff:" + s1.count1);
        System.out.println("Count1 value with object of class hod:" + s2.count1);
    }
}