TNT.java

package com.drtshock.testplugin;

import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.block.Block;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerMoveEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.plugin.java.JavaPlugin;


public class TestPlugin extends JavaPlugin implements Listener {

    @Override
    public void onEnable() {
        getServer().getPluginManager().registerEvents(this, this);
    }

    @EventHandler
    public void walk(PlayerMoveEvent event) {
        Player player = event.getPlayer();
        Location location = player.getLocation().add(0, -1, 0);
        Block block = location.getBlock();

            block.setType(Material.TNT);


        location.getWorld().dropItemNaturally(location.add(0, 2, 0), new ItemStack(Material.DIAMOND_BLOCK));
    }

}