Need help with checking args length

I cant seem to get my plugin to alert the user when they use too many or too little arguments. Here is my code:

import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;

public final class Flame extends JavaPlugin {
public void onEnable() {
getLogger().info("Test plugin has been enabled!");
}
public void onDisable() {
getLogger().info("Test plugin has been disabled!");
}
public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args){
if(cmd.getName().equalsIgnoreCase("ignite")){
Player s = (Player)sender;
Player target = s.getServer().getPlayer(args[0]);
target.setFireTicks(10000);
if(args.length < 1) {
sender.sendMessage("Not enough args!");
return false;
}
}
return false;
}
}

i've looked for the answer on other threads, but i cant seem to find anything. I'm very new to coding, so im still getting the hang of it. Any help would be greatly appreciated. thanks.

 

u should first test the length of args before u search the player. if args.length == 0 theres a nullpointerexception or a arrayindexoutofbounds exception

Code:

if(cmd.getName().equalsIgnoreCase("ignite"){
if(args.length == 1){
Player target = this.getServer().getPlayer(args[0]);
target.setFireTicks(1000);
}else{
if(sender instanceof Player){
Player player = (Player) sender;
player.sendMessage("usage: /ignite <playername>");
}else
getLogger().info("usage: /ignite <playername>");
}