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Changing vanilla classes without editing them


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I need help, I want to change what iron and gold drops, but i dunno the event that is doing it so I can't hook it. The only way i managed to do it is editing the BlockOre vanilla class, but this may cause mod incompatibility. I also want to remove some vanilla recipes without editing vanilla classes or is it uneccesery?

 

NOTE: I started modding forge 2 days ago, without knowing the java or any other language.

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ASM or Reflections.

Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable.  If you think this is the case, JUST REPORT ME.  Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice.

 

Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked.

 

DO NOT PM ME WITH PROBLEMS. No help will be given.

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I'll tell you what I did to change the loot from killing a sheep, I think it is similar to changing the drops of a iron ore block.

 

I removed the spawning of sheep in my main mod file.

I added my the spawning of a sheep(my mod sheep).

Then I created the class of 'my mod sheep' and extended the vanilla Minecraft Sheep class.

 

I used a @Override command to override the code that defined the drops when sheep gets killed.

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