how to change the spawner type?

this is my code:
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.player.PlayerInteractEvent;

public class ChangeSpawnerType {

@SuppressWarnings("deprecation")
@EventHandler
public void onClick(PlayerInteractEvent event)
{
Player p = event.getPlayer();
if (p.getTargetBlock(null, 5).getType() == Material.MOB_SPAWNER);
{
if (p.getItemInHand().getType() == Material.MONSTER_EGG);
{
int spawnnegg_type = p.getItemInHand().getDurability();
if (spawnegg_type=90) {
//change the spawner type
}

}}}}
i don't know how to change the spawner type
any help?

 

provide valid code with nullchecks and debug trace.

 

oh srry
spawnegg_type cannot be resolved to a variable

at line: if (spawnegg_type=90)
(there is a red line under spawnegg_type)

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

You probably need to change the following: if(spawnegg_type == 90)
And I'm not sure if durability is an int either, can't check atm.

If you want to compare something, use == and not =