It works

package com.example.examplemod;

import com.forgeessentials.core.ForgeEssentials;
import net.minecraft.block.Block;
import net.minecraft.block.BlockDirt;
import net.minecraft.world.World;
import com.sun.istack.internal.Nullable;
import net.minecraft.block.state.IBlockState;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.ItemStack;
import net.minecraft.util.EnumFacing;
import net.minecraft.util.EnumHand;
import net.minecraft.util.ITickable;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;
import net.minecraftforge.common.MinecraftForge;
import net.minecraftforge.event.AttachCapabilitiesEvent;
import net.minecraftforge.event.entity.player.PlayerInteractEvent;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.common.Mod.EventHandler;
import net.minecraftforge.fml.common.WorldAccessContainer;
import net.minecraftforge.fml.common.event.FMLInitializationEvent;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;

import java.util.EnumSet;

@Mod(modid = ExampleMod.MODID, version = ExampleMod.VERSION)
public class ExampleMod {
    public static final String MODID = "examplemod";
    public static final String VERSION = "1.0";

    @EventHandler
    public void init(FMLInitializationEvent event) {
        // some example code
        //System.out.println("DIRT BLOCK >> "+Blocks.DIRT.getUnlocalizedName());
        //MinecraftForge.EVENT_BUS.register(this);
        MinecraftForge.EVENT_BUS.register(this);
    }


    @SubscribeEvent
    public void leftClickBlock(PlayerInteractEvent.LeftClickBlock evt)
    {

        if (evt.getItemStack() != null) {
            System.out.println(evt.getItemStack().getDisplayName().toString());
        }

        if (evt.getItemStack() == null){
            System.out.println("You don't have anything in hand");
        }

        // When item use denied, the event will keep firing as long as the left click button is held.
        // This is due to how vanilla calls the left click handling methods to let people not lift their button when mining multiple blocks.
        // Note that when item use is denied, the cool down for the item does not occur. This is good!
    }

}