Thanks guys, for all the support, the thread got stickyed
Introduction
Hey there, So your here at MPGH and want to learn how to MOD eh? Well let me tell you just an easy thing

. It took me several tutorials in different areas to finally pull off my first mod the “Cow Diamond Hunter” Were the cow drops diamond instead of leather, simple but effective. The link will be added later

.
What you will need
> Java SDK
Java SE Downloads [Download the one that says “JAVA SE[Standard Edition] 6 Update 24”
>MCP-Minecraft Coders Pack
MCP Releases - Minecraft Coder Pack
>NotePad ++
Notepad++ 5.9 Release | 5.9
Setting up
>Install Java SDK
>Make a new folder in C:/ and call it “MCP” and put the contence of the *** Rar into the folder
>install notepad++
>Go to Start>Find computer and right click the text>Go to properties>Advanced System Settings(right)>Variables>New, Name: Path Location: C:\Program Files\Java\jdk1.6.0_24\bin or if you installed it somewere else.
Heres a video for Path setting.
>7ZIP
7-Zip
Starting the process
Now you have done all that Go into your *** folder and then locate your .minecraft folder.
Copy the bin folder and the recourses folder into the *** folder called “jar” or “jar files”
Now you have doen this run the decompiler. Let it do its thing. Then go to the sources folder/minecraft/net/minecraft/src and then open EntityCow.java with notepad++.
Now scroll down to the bottom and find
Code:
protected int getDropItemId()
{
return Item.leather.shiftedIndex;
}
No change the “leather” to anything like “diamond”. We will be replacing with diamond, so this is the code now:
Code:
protected int getDropItemId()
{
return Item.diamond.shiftedIndex;
}
Now save it as EntityCow.java (just click save)
Now open the recompliler and recompile it. There should be no errors, if you do get one PM me or comment with it.
Now open the conf folder in *** and edit client_obfuscation.txt. replace it with the name of the thing your editing! We edited EntityCow so replace everything with that, if we edited EntityCow and EntitySheep we would add another line with EntitySheep.
Save it and then run reobf, once its finished go to the final_out folder and then minecraft, youll see one or 2 class files in it, go into your .minecraft folder then bin then find minecraft.jar and right click and then with 7zip open achive. Youll see folders.
DELTE THE META-IF FODLER and then drag the class files in to the 7zip of minecraft.jar it warm you you are replacing files just ignor it and click yes.
Now just run your minecraft.exe normally and go kill a cow.
This is what you should have got: