How to change vanilla mobs drops

[Lufe]

Hey guys, I'm starting to learn Minecraft modding. Can you tell me why the pig keeps dropping just 1 diamons? It doesn't make sense

 

import net.minecraft.item.Items;
import net.minecraft.world.World;
import net.minecraftforge.event.entity.EntityJoinWorldEvent;
import net.minecraftforge.event.entity.living.LivingDeathEvent;
import net.minecraftforge.event.entity.living.LivingDropsEvent;
import net.minecraftforge.eventbus.api.SubscribeEvent;
import net.minecraftforge.fml.common.Mod;
import java.util.Random;

@Mod.EventBusSubscriber(modid = tutorialmod.MODID, bus = Mod.EventBusSubscriber.Bus.FORGE)
public class entities {

    @SubscribeEvent
    public static void pigsDroppingDiam(LivingDropsEvent event) {
        if (!(event.getEntity() instanceof PigEntity)) {
            return;
        }

        int diam = new Random().nextInt(3)+1;
        float diam1 = Float.parseFloat(String.valueOf(diam));
        System.out.println(diam);

        if (!event.getEntity().world.isRemote) {
            event.getEntityLiving().entityDropItem(new ItemStack(Items.DIAMOND), diam1);
        }
    }

 

Main:

 

package mod.stardev.mod1;

import net.minecraftforge.fml.common.Mod;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

@Mod(tutorialmod.MODID)
public final class tutorialmod {
    public static final String MODID = "tutorialmod";

    public static final Logger LOGGER = LogManager.getLogger(MODID);

    public tutorialmod() {
        LOGGER.debug("Hello from TutorialMod.");
    }
}

[Draco18s]

Specifically, you should want to use the Global Loot Modifier system which is a direct comparable (if more involved) system to LivingDropsEvent.