Why can't i use static variable in java constructor?

Example:

class Student{

Student() {
static int i = 0;
System.out.println(i++); 
}
public static void main(String args[]){
Student s1 = new Student();
Student s2 = new Student();
Student s3 = new Student();
}
} 

Here, Why can't i use static variable in java constructor?

Ans:

If you want to declare static variable then declare it outside of the constructor, at class level like this -

public class Student{

private static int i;

}
You declaration of static occurred at your constructor which is a local variable and local variable can not be static. And that's why you are getting - illegal modifier for parameter i. And finally for initializing static variable you may use a static initialization block (though it's not mandatory) -

public class Student{

private static int i;

static {
i = 5;
}

}