import net.minecraft.block.BlockObsidian; //导入依赖的package包/类
@Override
public void notifyBlockUpdate(World worldIn, BlockPos pos, IBlockState oldState, IBlockState currentState, int flags) {
	if (currentState.getBlock() == Blocks.FIRE && !(worldIn.getBlockState(pos.down()).getBlock() instanceof BlockObsidian) && !(worldIn.getBlockState(pos.down()).getBlock() instanceof BlockBush) && !(worldIn.getBlockState(pos.down()).getBlock() instanceof BlockTallGrass)) {
		IBlockState newStateBlock = BlockRegistry.specialfire.getDefaultState().withProperty(BlockSpecialFire.AGE, currentState.getValue(BlockFire.AGE)).withProperty(BlockSpecialFire.NORTH, currentState.getValue(BlockFire.NORTH)).withProperty(BlockSpecialFire.EAST, currentState.getValue(BlockFire.EAST)).withProperty(BlockSpecialFire.SOUTH, currentState.getValue(BlockFire.SOUTH)).withProperty(BlockSpecialFire.WEST, currentState.getValue(BlockFire.WEST)).withProperty(BlockSpecialFire.UPPER, currentState.getValue(BlockFire.UPPER));
		worldIn.setBlockState(pos, newStateBlock, flags);
	}
}
 

import net.minecraft.block.BlockObsidian; //导入依赖的package包/类
@SubscribeEvent
public void on(BlockEvent.HarvestDropsEvent e) {
    if (e.block instanceof BlockObsidian) {
        e.drops.clear();
        Random rand = new Random();
        ItemStack stack = new ItemStack(ModItems.obsidianChunk, rand.nextInt(4) + 1);
        e.drops.add(stack);
    }
}