1.)
public class MainClass extends JavaPlugin implements CommandExecutor {

	@Override
    public void onEnable() {
		getCommand("live").setExecutor(this);
        System.out.println("[LivePlugin] De plugin staat AAN.");

    }

    @Override
    public void onDisable() {

        System.out.println("[LivePlugin] De plugin staat UIT.");
    }

    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String s, String[] args) {

        if (cmd.getName().equalsIgnoreCase("live")) {
	        if (!sender.hasPermission("OP.modify")) {
	        	sender.sendMessage(ChatColor.RED + "Je hebt niet genoeg rechten om /live uit te voeren.");
	            return false;
            }

	        if(args.length == 0) {
	            showHelp(sender);
	            return true;
	        }

	        Player target = Bukkit.getPlayer(args[0]);

	        if(target == null) {
	        	sender.sendMessage(ChatColor.RED + "De spelersnaam " + ChatColor.RED + ChatColor.BOLD +  args[0] + ChatColor.RED + " is niet gevonden.");
	            return true;
	        }

	        if(args.length == 3) {
	        	for (Player onlinePlayer: getServer().getOnlinePlayers()) {
		            onlinePlayer.sendMessage("");
		            onlinePlayer.sendMessage(ChatColor.RED + "" + ChatColor.BOLD + "Er is iemand LIVE!");
		            onlinePlayer.sendMessage(ChatColor.AQUA + args[0] + ChatColor.GRAY +
		                    " is Live op het kanaal " + ChatColor.AQUA + args[1] + ChatColor.GRAY + ". ");
		            onlinePlayer.sendMessage( ChatColor.GRAY + "" + ChatColor.BOLD +  "Link: " + ChatColor.AQUA + args[2] +
		                    ChatColor.GRAY + ".");
		            onlinePlayer.sendMessage("");
	        	}
	        } else {
	            showHelp(sender);
	            return true;

	        }
        }
        return true;
    }


    public void showHelp(CommandSender player) {
        player.sendMessage(ChatColor.DARK_GRAY + "" + ChatColor.BOLD + "➜ " + ChatColor.AQUA + "/live <speler> <kanaal> <link>");
    }


}



2.)
public class MainClass extends JavaPlugin {

    @Override
    public void onEnable() {
    	saveDefaultConfig();
        new BukkitRunnable() {

            @Override
            public void run() {
            	for (Player onlinePlayer: getServer().getOnlinePlayers()) {
                ArrayList<String> messages = (ArrayList<String>) getConfig().getStringList("messages");
                Random random = new Random();
                int index = random.nextInt(messages.size());

                onlinePlayer.sendMessage(messages.get(index).replace("&", "§"));
            	}
            }
        }.runTaskTimer(this, 60, 100);

    }

}


3.)
public class MainClass extends JavaPlugin implements Listener {

	public void onEnable() {

        System.out.println(ChatColor.GREEN + "[joinMessage]: De plugin is ingeschakeld.");
        Bukkit.getServer().getPluginManager().registerEvents(this, this);
    }

    public void onDisable() {

        System.out.println(ChatColor.RED + "[joinMessage]: De plugin is uitgeschakeld.");
    }

    @EventHandler
    public void onPlayerJoin(PlayerJoinEvent e) {

            Player p = e.getPlayer();

            p.sendMessage("");
            p.sendMessage("§fWelkom §f§l" + p.getName() + " §fop §2BattleGroundsMC");
            p.sendMessage("");
            p.sendMessage("§6§lTwitter §8§l>>  §fhttps://twitter.com/BGMCZakelijk?lang=nl");
            p.sendMessage("§6§lDiscord §8§l>>  §fhttps://discord.gg/YzHeSc2");
            p.sendMessage("§6§lYouTube §8§l>>  §fhttps://www.youtube.com/channel/UCRXMEvzxeM1lJpGGdkkDQqQ?disable_polymer=true");
            p.sendMessage("§6§lWebsite §8§l>>  §fhttps://www.battlegroundsmc.nl/");
            p.sendMessage("§6§lShop §8§l>>  §fhttps://www.battlegroundsmc.nl/store/");
            p.sendMessage("");
    }
}




4.)
public class MainClass extends JavaPlugin implements Listener {

	public String afboording = "§e§l------------------------";

	 public void onEnable() {

         System.out.println(ChatColor.GREEN + "[joinEvent]: De plugin is ingeschakeld.");
         Bukkit.getServer().getPluginManager().registerEvents(this, this);
     }

     public void onDisable() {

         System.out.println(ChatColor.RED + "[joinEvent]: De plugin is uitgeschakeld.");
     }

     @EventHandler
     public void onPlayerJoin1(PlayerJoinEvent e) {
             Player p = e.getPlayer();
             if (p.hasPermission("joinmessage.donator")) {
            	 if (!p.hasPermission("OP.modify")) {

            		 for (Player onlinePlayer: getServer().getOnlinePlayers()) {

            		 onlinePlayer.sendMessage(afboording);
            onlinePlayer.sendMessage("§a§lDONATOR §f§l" + p.getName());
            onlinePlayer.sendMessage("§2is nu online op §2§lSkyBlock§2.");
            onlinePlayer.sendMessage(afboording);
}
}
}
}
     @EventHandler
     public void onPlayerJoin2(PlayerJoinEvent e) {
             Player p = e.getPlayer();
             if (p.hasPermission("joinmessage.staff")) {
            	 if (!p.hasPermission("OP.modify")) {

            		 for (Player onlinePlayer: getServer().getOnlinePlayers()) {


             onlinePlayer.sendMessage(afboording);
             onlinePlayer.sendMessage("§4§lSTAFFLID §f§l" + p.getName());
             onlinePlayer.sendMessage("§2is nu online op §2§lSkyBlock§2.");
             onlinePlayer.sendMessage(afboording);
}
}
}
}
     @EventHandler
     public void onPlayerJoin3(PlayerJoinEvent e) {
             Player p = e.getPlayer();
             if (p.hasPermission("OP.modify")) {

            	    for (Player onlinePlayer: getServer().getOnlinePlayers()) {

            onlinePlayer.sendMessage(afboording);
            onlinePlayer.sendMessage("§5§lMANAGEMENT §f§l" + p.getName());
            onlinePlayer.sendMessage("§2is nu online op §2§lSkyBlock§2.");
            onlinePlayer.sendMessage(afboording);
}
}
}

     @EventHandler
     public void onPlayerJoin4(PlayerJoinEvent e) {
             Player p = e.getPlayer();
             if (p.hasPermission("joinmessage.youtube")) {
            	 if (!p.hasPermission("OP.modify")) {

            		 for (Player onlinePlayer: getServer().getOnlinePlayers()) {

            		 onlinePlayer.sendMessage(afboording);
            onlinePlayer.sendMessage("§f&lYou&4&lTuber §f§l" + p.getName());
            onlinePlayer.sendMessage("§2is nu online op §2§lSkyBlock§2.");
            onlinePlayer.sendMessage(afboording);
}
}
}
}
}



5.)
public class MainClass extends JavaPlugin implements Listener {

	@Override
    public void onEnable() {

        System.out.println("[AntiEscape] De plugin staat AAN.");
        Bukkit.getPluginManager().registerEvents(this, this);
    }

    @Override
    public void onDisable() {

        System.out.println("[AntiEscape] De plugin staat UIT.");
    }
    @EventHandler
    public void onBreak(BlockBreakEvent e) {
    	Player p = e.getPlayer();
    	if (!p.hasPermission("AntiEscape.break")) {
    		e.setCancelled(true);
    	}
    	if (e.getBlock().getType() == Material.GLASS) {
    		e.setCancelled(false);
	    }
}
}