Main:

package me.William.TigerTPS;

import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.plugin.java.JavaPlugin;

public class Main extends JavaPlugin {

    @Override
    public void onEnable() {
        this.getCommand("ttps").setExecutor(new TpsCommand());
        this.getCommand("tpup").setExecutor(new TpupCommand());
        getServer().getPluginManager().registerEvents(new LoginListener(), this);
        getServer().getPluginManager().registerEvents(new BreakBlockListener(), this);
        Bukkit.getServer().getScheduler().scheduleSyncRepeatingTask(this, new Lag(), 100L, 1L);
    }

    @Override
    public void onDisable() {
        getServer().getScheduler().cancelTasks(this);
    }
}


TpsCommand:

package me.William.TigerTPS;

import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;

public class TpsCommand implements CommandExecutor {
    @Override
    public boolean onCommand(CommandSender commandSender, Command command, String s, String[] strings) {
        if (command.getName().equalsIgnoreCase("ttps")) {
            commandSender.sendMessage(ChatColor.AQUA + "TPS: " + ChatColor.GOLD + Lag.getTPS() );
            return true;
        }
        return false;
    }
}

TpupCommand:

package me.William.TigerTPS;

import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;

public class TpsCommand implements CommandExecutor {
    @Override
    public boolean onCommand(CommandSender commandSender, Command command, String s, String[] strings) {
        if (command.getName().equalsIgnoreCase("ttps")) {
            commandSender.sendMessage(ChatColor.AQUA + "TPS: " + ChatColor.GOLD + Lag.getTPS() );
            return true;
        }
        return false;
    }
}

Lag:

package me.William.TigerTPS;

public class Lag
        implements Runnable
{
    public static int TICK_COUNT= 0;
    public static long[] TICKS= new long[600];
    public static long LAST_TICK= 0L;

    public static double getTPS()
    {
        return getTPS(100);
    }

    public static double getTPS(int ticks)
    {
        if (TICK_COUNT< ticks) {
            return 20.0D;
        }
        int target = (TICK_COUNT- 1 - ticks) % TICKS.length;
        long elapsed = System.currentTimeMillis() - TICKS[target];

        return ticks / (elapsed / 1000.0D);
    }

    public static long getElapsed(int tickID)
    {
        if (TICK_COUNT- tickID >= TICKS.length)
        {
        }

        long time = TICKS[(tickID % TICKS.length)];
        return System.currentTimeMillis() - time;
    }

    public void run()
    {
        TICKS[(TICK_COUNT% TICKS.length)] = System.currentTimeMillis();

        TICK_COUNT+= 1;
    }
}

plugin.yml:

name: TigerTPS
main: me.William.TigerTPS.Main
version: 1.0.0
authors:
    - Taogrin
    - William
commands:
    ttps:
        description: a
    tpup:
        description: a

LoginListener:

package me.William.TigerTPS;

import org.bukkit.ChatColor;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.event.player.PlayerQuitEvent;

public class LoginListener implements Listener {
    @EventHandler
    public void onJoin(PlayerJoinEvent event) {
        String  message = ChatColor.DARK_GRAY + "Player " + ChatColor.RED + event.getPlayer().getName() + ChatColor.DARK_GRAY + " is joined whe server :)";
        event.setJoinMessage(message);
    }
    @EventHandler
    public void onQuit(PlayerQuitEvent event) {
        String  message = ChatColor.DARK_GRAY + "Player " + ChatColor.RED + event.getPlayer().getName() + ChatColor.DARK_GRAY + " left the server :(";
        event.setQuitMessage(message);
    }

}

breakBlockEventListener:

package me.William.TigerTPS;

import org.bukkit.ChatColor;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.BlockBreakEvent;

public class BreakBlockListener implements Listener {
    @EventHandler
    public void onBlockBreak(BlockBreakEvent event){
        if (!event.getPlayer().hasPermission("test")) {
            event.setCancelled(true);
            event.getPlayer().sendMessage(ChatColor.RED + "You dont have permissions to break block's!!!");
        }
    }
}