Changing vanilla classes without editing them

[Evgenit]

Title

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.

[Draco18s]

ASM or Reflections.

[Evgenit]

As I said i started proggraming 2 days ago. What is ASM/reflections?

[Musebo]

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.

[Akjosch]

DemoXin just published his "FortuneOres" mod which does exactly that and is open source, so you can check for yourself how he did that - or ask him:

 

http://www.minecraftforum.net/topic/2079807-fortuneores/

[Knux14]

By using a coremod: http://www.minecraftforum.net/topic/1854988-tutorial-162-changing-vanilla-without-editing-base-classes-coremods-and-events-very-advanced/

or

http://www.minecraftforge.net/wiki/Using_Access_Transformers

 

or By using reflexion: http://tutorials.jenkov.com/java-reflection/index.html

 

Coremod is the way to do because it's Forge based. But reflexion works too.

[Evgenit]

Omg, he was 1 day ahead, just about to make the same thing... Anyways thanks guys, good thing my mod has something more...