Creating a block with a plugin.

Sorry for the mistakes used by google translator. I just started creating plugins, so this question can be silly. I can talk for a long time about what I'm trying to do, or describe a specific situation, but I won’t.
I have a coordinate and I need to put a block on it.
I tried this setBlock (loc, Material.STONE); - does not work.

 

Thank you, but it didn’t work for me, so I’ll say what I’m doing specifically. I am making a plugin similar to WorldGuard, here is the code:

Code:

package Klaster.main;
import org.bukkit.Location;
import org.bukkit.ChatColor;
import org.bukkit.block.Block;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.BlockBreakEvent;
import org.bukkit.event.player.PlayerJoinEvent;
import  org.bukkit.Material;
public class Handler implements Listener{
    int x1 = 1;
    int y1 = 1;
    int z1 = 1;
    int x2 = 10;
    int y2 = 10;
    int z2 = 10;
    @EventHandler
    public void join(PlayerJoinEvent e) {
        Player p = e.getPlayer();
        p.sendMessage(p.getName());
       
    }
    @EventHandler
    public void block(BlockBreakEvent e) {
         Player p = e.getPlayer();
         Block b = e.getBlock();
         p.sendMessage(ChatColor.AQUA + "Ты сломал "+ b.getX() + " "+ b.getY() + " "+ b.getZ()+ " "+ b.getType());
         if(b.getX() >= x1 && b.getY() >= y1 && 
         b.getZ() >= z1 && b.getX() <= x2 &&
         b.getY() <= y2 &&b.getZ() <= z2) {
        //If a person broke a block between coordinates 1 1 1 and 10 10 10, then this block must be put back
         Location loc = b.getLocation();
         p.sendMessage("Privated!");
         loc.getBlock().setType(Material.STONE);
         
         }
    }
   
}

 

Perhaps we did not understand each other a little. Yes, the action in the “if” takes place when the block is destroyed, and in this case, in place of this block, which is broken, and which is already air, I need to put this block again.

 

Thanks, but how? Still, I would like to know why loc.getBlock (). SetType does not work.

 

Thanks.