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It's basically the same in Java as in C++; just invoke the constructor of BlockPos. BlockPos pos = new BlockPos(x, y, z); Note that everything in Java apart from primitive values is a pointer. However, you should learn Java before making a mod, as the Forge API can be a bit confusing for new modders, and not knowing Java will greatly increase the difficulty of learning to mod. if(Minecraft.getInstance().gameSettings.keyBindSprint.isKeyDown()) { worldIn.setBlockState(pos, Blocks.NOTE_BLOCK.getDefaultState().with(NOTE, _new)); } else { worldIn.setBlockState(pos, ModBlocks.noteblock_low.getDefaultState().with(NOTE, _new)); } You are reaching across logical sides. This will crash on a dedicated server, as the Minecraft class only exists on the client, while all World interactions should be done on the server. You should send a packet to the server about the pressing of the key bind and set the BlockState on the server side.

The UnicornEntityModel class is unnecessary. Replace UnicornEntityModel in the first line of the render class with ModelUnicorn<UnicornEntity>. Switch LivingRenderer for MobRenderer. In your model class replace AbstractHorseEntity with LivingEntity.