[Pytanie]Jak sprawdzić czy argument to int ?

[MarcinCraftTV]

Cześć, tak jak w temacie proszę o pomoc.

Dziękuje  ­

[TheMolkaPL.]

try {

int i = args[numer argumentu];

} catch (NumberFormatException ex) {

// nie jest intem

}

[MarcinCraftTV]

@TheMolkaPL. Jak mam taki oto kod to gdzie mam to wkleić ? 

if(args.length == 1) {
    int ExpPlayer1 = Integer.parseInt(args[0]);
     p.giveExp(ExpPlayer1);
    
   }

­

[TheMolkaPL.]

if(args.length == 1) {

int exp = -1;

try {

exp = Integer.valueOf(args[0]); // parseInt(...) to jest to samo, ale valueOf używa większość programistów, różnica tylko taka, że valueOf zwraca Integer (obiekt), a parseInt int (prymitywny)

} catch (NumberFormatException ex) {

throw new CommandException(args[0] + " nie jest liczba calkowita.");

}

p.giveExp(exp);

}

[MarcinCraftTV]

@TheMolkaPL. Wywala mi taki błąd że coś jest nullem 

[11:21:27 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'exp'
in plugin KcTools v1.0
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[cra
ftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:17
5) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at org.bukkit.craftbukkit.v1_7_R1.CraftServer.dispatchCommand(CraftServe
r.java:683) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.PlayerConnection.handleCommand(PlayerCon
nection.java:952) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java
:814) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.PacketPlayInChat.a(PacketPlayInChat.java
:28) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.PacketPlayInChat.handle(PacketPlayInChat
.java:47) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:146
) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134) [craf
tbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:6
55) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:2
50) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:5
45) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java
:457) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:6
17) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
Caused by: org.bukkit.command.CommandException: s
        at net.MarcinCraftTV.KcTools.Command.ExpCommand.onCommand(ExpCommand.jav
a:34) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[cra
ftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        ... 13 more

­

[TheMolkaPL.]

zamiast

 

throw new CommandException(args[0] + " nie jest liczba calkowita.");

 

używaj coś co zatrzyma kod (return) i wyśle błąd do gracza.

[MarcinCraftTV]

@TheMolkaPL. Działa, dziękuje za naukę

[Zarax]

Zamykam na prośbę autora.