Dimension command

CommandDimension.java

package kaendfinger.ForgeCommander.Commands;

import net.minecraft.command.CommandBase;
import net.minecraft.command.ICommandSender;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.server.MinecraftServer;
import net.minecraft.world.World;

public class CommandDimension extends CommandBase
{
  public CommandDimension()
	{
	}
	
    public String getCommandName()
    {
        return "dimension";
    }
    public void processCommand(ICommandSender sender, String[] params)
    {
    	String username = sender.getCommandSenderName();
    	EntityPlayerMP p;
    	p = (EntityPlayerMP)getCommandSenderAsPlayer(sender);
        World cw = (World)MinecraftServer.getServer().worldServerForDimension(p.dimension);
        if (params[1] == "") {
    		if (p.dimension == 0) {
    			sender.sendChatToPlayer("Teleporting to Overworld");
    			World w = (World)MinecraftServer.getServer().worldServerForDimension(-1);
        	    p.setWorld(w);
        	    w.updateEntity(p);
        	    return;
    		} if (p.dimension == -1) {
    			sender.sendChatToPlayer("Teleporting to Nether");
    			World w = (World)MinecraftServer.getServer().worldServerForDimension(-1);
        	    p.setWorld(w);
        	    w.updateEntity(p);
        	    return;
    		}
    	}
    	if (params[1] == "nether") {
    		if (p.dimension == -1) {
    			sender.sendChatToPlayer("Already in Nether");
    			return;
    		}
    		sender.sendChatToPlayer("Teleporting to Nether");
    		World w = (World)MinecraftServer.getServer().worldServerForDimension(-1);
    	    p.setWorld(w);
    	    w.updateEntity(p);
    	    return;
    	}
    	if (params[1] == "overworld") {
    		if (p.dimension == 0) {
    			sender.sendChatToPlayer("Already in Overworld");
    			return;
    		}
    		sender.sendChatToPlayer("Teleporting to Overworld");
    		World w = (World)MinecraftServer.getServer().worldServerForDimension(0);
    	    p.setWorld(w);
    	    w.updateEntity(p);
    	    return;
    	}
    	sender.sendChatToPlayer("Error: OH SHIT SOMETHING HAPPENED KEN, GET YOUR ASS ON IT!");
    }
    
    public boolean canCommandSenderUseCommand(ICommandSender par1ICommandSender)
    {
        return true;
    }
}