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System.out.println("Hello world!");
ModLoader.getMinecraftInstance.thePlayer.addChatMessage("Hello world!");
http://www.minecraftforum.net/topic/1142517-125more-tools-and-weapons/
System.out.println("Hello world!");Or if you want to output to the chat window (this does use ModLoader) do:
ModLoader.getMinecraftInstance.thePlayer.addChatMessage("Hello world!");