The operator is undefined

Question

I just tried to make a simple class that lets me figure out the length of a file:

public class Size {

    long s = 0;
    int a;

    public static void mai         


        

Answer 1

Primitive types in Java cannot be null. If you want to check for 0, do a != 0.

Answer 2

Put a into an Integer object, which can be compared to null:

Integer value = new Integer(a);

while (value != null)
{
    // Do stuff
}

Answer 3

you should assign (or) check NULL values only for a pointer. For integer values, initialise it to any number ,like a flag and check for that condition. NULL can be assigned or checked only with a pointer variable