Static in Java - A Simple Java program

/**
 * Static variable in java
 *
 * Since JDK 1.7, it is not possible to execute a java class without the main method.
 */
package com.cfed.tutorials;

/**
 * @author consumerfed
 *
 */
public class Student {

int rollNo =0;
String studentName;
static int counter = 0; 
int count=0;



public Student(int rollNo, String studentName){
this.rollNo = rollNo;
this.studentName = studentName;
counter ++;
count++;
}

/**
* The static method can not use non static data member or call non-static method directly.
*
* this and super cannot be used in static context.
*
*/
// public static void display() {
// System.out.println(" roll No :"+rollNo);
// print();
// }
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Student s1 = new Student(1, "sachin");
Student s2 = new Student(2, "dravid");
Student s3 = new Student(3, "saurav");
s3.print();
// Student.display();

}
public void print() {
// TODO Auto-generated method stub
System.out.println(" counter : "+counter);
System.out.println(" count : " + count);

}

}