ItemBoxingGlove.java

package com.team.kalstuff.item;

import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.init.MobEffects;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.potion.PotionEffect;
import net.minecraft.util.ActionResult;
import net.minecraft.util.DamageSource;
import net.minecraft.util.EnumHand;
import net.minecraft.util.EnumParticleTypes;
import net.minecraft.util.NonNullList;
import net.minecraft.world.World;
import net.minecraft.world.WorldServer;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;

public class ItemBoxingGlove extends Item {
	
	
	public ItemBoxingGlove() {
        this.setHasSubtypes(true);
	}
	
	@Override
	public boolean onLeftClickEntity(ItemStack stack, EntityPlayer player, Entity entity) {
		
		if (player.getEntityWorld().isRemote) return true;
		
		if (((EntityLivingBase) entity).getHealth() - 1.0 <= 0.0F) {

            ((WorldServer)player.getEntityWorld()).spawnParticle(EnumParticleTypes.CRIT, entity.posX, entity.posY + (double)entity.height * 0.5D, entity.posZ, 100, 0.0D, 0.0D, 0.0D, 0.5D, new int[0]);

			((EntityLivingBase) entity).addPotionEffect(new PotionEffect(MobEffects.BLINDNESS, 200, 0, true, true));
			((EntityLivingBase) entity).addPotionEffect(new PotionEffect(MobEffects.SLOWNESS, 200, 9, true, true));
			((EntityLivingBase) entity).addPotionEffect(new PotionEffect(MobEffects.JUMP_BOOST, 200, 128, true, true));

			return true;
		}
		
		return false;
	}
	
	@Override
	public ActionResult<ItemStack> onItemRightClick(World worldIn, EntityPlayer playerIn, EnumHand hand) {
		
		playerIn.swingArm(hand);
		
		return super.onItemRightClick(worldIn, playerIn, hand);
	}
	
	@Override
	public boolean itemInteractionForEntity(ItemStack stack, EntityPlayer playerIn, EntityLivingBase target, EnumHand hand) {
		
		if (playerIn.getEntityWorld().isRemote)	return super.itemInteractionForEntity(stack, playerIn, target, hand);
		
		playerIn.swingArm(hand);
		
		if (((EntityLivingBase) target).getHealth() - 1.0 <= 0.0F) {

            ((WorldServer)playerIn.getEntityWorld()).spawnParticle(EnumParticleTypes.CRIT, target.posX, target.posY + (double)target.height * 0.5D, target.posZ, 100, 0.0D, 0.0D, 0.0D, 0.5D, new int[0]);

			((EntityLivingBase) target).addPotionEffect(new PotionEffect(MobEffects.BLINDNESS, 200, 0, true, true));
			((EntityLivingBase) target).addPotionEffect(new PotionEffect(MobEffects.SLOWNESS, 200, 9, true, true));
			
			((EntityLivingBase) target).addPotionEffect(new PotionEffect(MobEffects.JUMP_BOOST, 200, 128, true, true));
			return super.itemInteractionForEntity(stack, playerIn, target, hand);
		}
		
		target.attackEntityFrom(DamageSource.causePlayerDamage(playerIn), 1.0F);
		
		return super.itemInteractionForEntity(stack, playerIn, target, hand);
	}
	
    /**
     * returns a list of items with the same ID, but different meta (eg: dye returns 16 items)
     */
    @SideOnly(Side.CLIENT)
    public void getSubItems(Item itemIn, CreativeTabs tab, NonNullList<ItemStack> subItems)
    {
        for (int i = 0; i < 16; ++i)
        {
            subItems.add(new ItemStack(itemIn, 1, i));
        }
    }
}