'for' function not working?

Code:

Code:java

for (String credit : credits) {
    if (credit.startsWith(player.getName() + ":")) {
        amm = credit.replace(player.getName() + ":", "");
        credits.remove(credit);
    }
}

Error:

Code:

2013-02-17 12:23:47 [INFO] SoS_Dylan issued server command: /buy
2013-02-17 12:23:47 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'buy' in plugin PvP v1.0
>      at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
>      at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:186)
>      at org.bukkit.craftbukkit.v1_4_6.CraftServer.dispatchCommand(CraftServer.java:514)
>      at net.minecraft.server.v1_4_6.PlayerConnection.handleCommand(PlayerConnection.java:979)
>      at net.minecraft.server.v1_4_6.PlayerConnection.chat(PlayerConnection.java:897)
>      at net.minecraft.server.v1_4_6.PlayerConnection.a(PlayerConnection.java:852)
>      at net.minecraft.server.v1_4_6.Packet3Chat.handle(Packet3Chat.java:44)
>      at net.minecraft.server.v1_4_6.NetworkManager.b(NetworkManager.java:290)
>      at net.minecraft.server.v1_4_6.PlayerConnection.d(PlayerConnection.java:112)
>      at net.minecraft.server.v1_4_6.ServerConnection.b(SourceFile:39)
>      at net.minecraft.server.v1_4_6.DedicatedServerConnection.b(SourceFile:30)
>      at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:598)
>      at net.minecraft.server.v1_4_6.DedicatedServer.r(DedicatedServer.java:224)
>      at net.minecraft.server.v1_4_6.MinecraftServer.q(MinecraftServer.java:494)
>      at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:427)
>      at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
Caused by: java.util.ConcurrentModificationException
>      at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
>      at java.util.AbstractList$Itr.next(AbstractList.java:343)
>      at me.SoSDylan.PvP.Main.onCommand(Main.java:352)
>      at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
>      ... 15 more
>

 

You're getting a ConcurrentModificationException. What is on line 352?

 

You're removing from the list while iterating through it.

 

You can use an Iterator to remove elements while looping....

Code:

Iterator<String> iterator = credits.iterator();
String credit;

while(iterator.hasNext())
{
    credit = iterator.next(); // get next element and store it ! because every time you call .next() it will give you the next one.

    if( ... whatever)
        iterator.remove(); // remove current element
}