Just search Google for "how to install Minecraft Coder Pack" and there are probably hundreds of videos. I can't remember off the top of my head but I remember just having to run a script and it decompiled the Minecraft.jar and added some comments. I used it mostly for reference to see how methods worked though to help me with Bukkit plugins, though, and didn't actually make singleplayer mods.
When I installed MCP, I just downloaded it from their web site and followed the instructions in readme-mcp.txt (in the docs folder), although I just use Notepad to edit code (base classes). There is another readme file in that folder with instructions to install it for Eclipse:
To use eclipse with MCP, just do the following steps:
- Decompile the Minecraft sources
- Open Eclipse
- Select the "eclipse" folder in MCP as workspace
- Create a mod
- You can test the modified client and server in Eclipse, debug
settings are already prepared to start the game in the IDE
- Recompile and reobfuscate as usual
Yeah that...
TheMasterCaver's First World - possibly the most caved-out world in Minecraft history - includes world download.
TheMasterCaver's World - my own version of Minecraft largely based on my views of how the game should have evolved since 1.6.4.
Why do I still play in 1.6.4?