import net.minecraft.block.BlockGravel; //导入依赖的package包/类
private static boolean checkBlockAbove(World w, int x, int y, int z)
{
    Block b = w.getBlock(x, y, z);
    if (b instanceof BlockSand)
    {
        return true;
    }
    if (b instanceof BlockGravel)
    {
        return true;
    }
    return false;
}
 

import net.minecraft.block.BlockGravel; //导入依赖的package包/类
private static boolean checkBlockAbove( World pWorld, int pLocX, int pLocY, int pLocZ )
{
  Block tBlock = pWorld.getBlock( pLocX, pLocY, pLocZ );
  if(tBlock instanceof BlockSand)
  {
    return true;
  }
  if(tBlock instanceof BlockGravel)
  {
    return true;
  }
  return false;
}
 

import net.minecraft.block.BlockGravel; //导入依赖的package包/类
private boolean isDefered(StructureBlock sb) {
  Block block = GameRegistry.findBlock(sb.getModId(), sb.getBlockName());
  if(block == null) {
    return false;
  }
  
  return block instanceof BlockTorch || block instanceof BlockSand || block instanceof BlockGravel || block instanceof BlockAnvil 
      || block instanceof BlockTripWireHook || block instanceof  BlockTripWire|| block instanceof BlockRedstoneWire;
}