Hashcode of an int

Question

What is the hashcode of a primitive type, such as int?

for example, let's say num was an interger.

int hasCode = 0;  if (num != 0) {   hasCode = hasCode + num.hashCode(); } 

Answer 1

Taken from the Integer.class source code:

/**  * Returns a hash code for this {@code Integer}.  *  * @return  a hash code value for this object, equal to the  *          primitive {@code int} value represented by this  *          {@code Integer} object.  */ public int hashCode() {     return value; } 

Where value is the value of the integer.

Answer 2

For the hashCode of an int the most natural choice is to use the int itself. A better question is what to use for the hashCode of a long since it doesn't fit into the int-sized hashcode. Your best source for that—and all hashCode-related questions—would be Effective Java.