Java reflection - Get values from class instance field

Question

I am trying to create an some cheat for Minecraft. For this I decided to use reflection and agents. At the first stage, a question arose. I have Minecraft.class class. This class has getMinecraft() method that returns the instance of Minecraft. And this instance has player field. From this field, i need to get posX variable. I think I did not explain very clearly, so here is an example code of what I want to do:

final net.minecraft.client.Minecraft mc = net.minecraft.client.Minecraft.getMinecraft();
System.out.println(mc.player.posX);

And now, is it possible to somehow implement this through reflection?

Answer 1

You use the following reflection methods:

• Class.forName(String className)

  • getMethod(String name, Class<?>... parameterTypes)

    • invoke(Object obj, Object... args)

  • getField(String name)

    • get(Object obj)

Class<?> minecraftClass = Class.forName("net.minecraft.client.Minecraft");
Object mc = minecraftClass.getMethod("getMinecraft")
                          .invoke(null);
Object player = mc.getClass().getField("player")
                  .get(mc);
Object posX = player.getClass().getField("posX")
                    .get(player);
System.out.println(posX);