Need help on Explosion Class

[yuckyh]

Spoiler

public void doExplosionA() {
    Set<BlockPos> set = Sets.newHashSet();
    int i = true;

    int k;
    int l;
    for(int j = 0; j < 16; ++j) {
        for(k = 0; k < 16; ++k) {
            for(l = 0; l < 16; ++l) {
                if (j == 0 || j == 15 || k == 0 || k == 15 || l == 0 || l == 15) {
                    double d0 = (double)((float)j / 15.0F * 2.0F - 1.0F);
                    double d1 = (double)((float)k / 15.0F * 2.0F - 1.0F);
                    double d2 = (double)((float)l / 15.0F * 2.0F - 1.0F);
                    double d3 = Math.sqrt(d0 * d0 + d1 * d1 + d2 * d2);
                    d0 /= d3;
                    d1 /= d3;
                    d2 /= d3;
                    float f = this.size * (0.7F + this.world.rand.nextFloat() * 0.6F);
                    double d4 = this.x;
                    double d6 = this.y;
                    double d8 = this.z;

                    for(float var21 = 0.3F; f > 0.0F; f -= 0.22500001F) {
                        BlockPos blockpos = new BlockPos(d4, d6, d8);
                        IBlockState iblockstate = this.world.getBlockState(blockpos);
                        IFluidState ifluidstate = this.world.getFluidState(blockpos);
                        if (!iblockstate.isAir(this.world, blockpos) || !ifluidstate.isEmpty()) {
                            float f2 = Math.max(iblockstate.getExplosionResistance(this.world, blockpos, this.exploder, this), ifluidstate.getExplosionResistance(this.world, blockpos, this.exploder, this));
                            if (this.exploder != null) {
                                f2 = this.exploder.getExplosionResistance(this, this.world, blockpos, iblockstate, ifluidstate, f2);
                            }

                            f -= (f2 + 0.3F) * 0.3F;
                        }

                        if (f > 0.0F && (this.exploder == null || this.exploder.canExplosionDestroyBlock(this, this.world, blockpos, iblockstate, f))) {
                            set.add(blockpos);
                        }

                        d4 += d0 * 0.30000001192092896D;
                        d6 += d1 * 0.30000001192092896D;
                        d8 += d2 * 0.30000001192092896D;
                    }
                }
            }
        }
    }

    this.affectedBlockPositions.addAll(set);
    float f3 = this.size * 2.0F;
    k = MathHelper.floor(this.x - (double)f3 - 1.0D);
    l = MathHelper.floor(this.x + (double)f3 + 1.0D);
    int i2 = MathHelper.floor(this.y - (double)f3 - 1.0D);
    int i1 = MathHelper.floor(this.y + (double)f3 + 1.0D);
    int j2 = MathHelper.floor(this.z - (double)f3 - 1.0D);
    int j1 = MathHelper.floor(this.z + (double)f3 + 1.0D);
    List<Entity> list = this.world.getEntitiesWithinAABBExcludingEntity(this.exploder, new AxisAlignedBB((double)k, (double)i2, (double)j2, (double)l, (double)i1, (double)j1));
    ForgeEventFactory.onExplosionDetonate(this.world, this, list, (double)f3);
    Vec3d vec3d = new Vec3d(this.x, this.y, this.z);

    for(int k2 = 0; k2 < list.size(); ++k2) {
        Entity entity = (Entity)list.get(k2);
        if (!entity.isImmuneToExplosions()) {
            double d12 = entity.getDistance(this.x, this.y, this.z) / (double)f3;
            if (d12 <= 1.0D) {
                double d5 = entity.posX - this.x;
                double d7 = entity.posY + (double)entity.getEyeHeight() - this.y;
                double d9 = entity.posZ - this.z;
                double d13 = (double)MathHelper.sqrt(d5 * d5 + d7 * d7 + d9 * d9);
                if (d13 != 0.0D) {
                    d5 /= d13;
                    d7 /= d13;
                    d9 /= d13;
                    double d14 = (double)this.world.getBlockDensity(vec3d, entity.getBoundingBox());
                    double d10 = (1.0D - d12) * d14;
                    entity.attackEntityFrom(this.getDamageSource(), (float)((int)((d10 * d10 + d10) / 2.0D * 7.0D * (double)f3 + 1.0D)));
                    double d11 = d10;
                    if (entity instanceof EntityLivingBase) {
                        d11 = EnchantmentProtection.getBlastDamageReduction((EntityLivingBase)entity, d10);
                    }

                    entity.motionX += d5 * d11;
                    entity.motionY += d7 * d11;
                    entity.motionZ += d9 * d11;
                    if (entity instanceof EntityPlayer) {
                        EntityPlayer entityplayer = (EntityPlayer)entity;
                        if (!entityplayer.isSpectator() && (!entityplayer.isCreative() || !entityplayer.abilities.isFlying)) {
                            this.playerKnockbackMap.put(entityplayer, new Vec3d(d5 * d10, d7 * d10, d9 * d10));
                        }
                    }
                }
            }
        }
    }

}

public void doExplosionB(boolean p_77279_1_) {
    this.world.playSound((EntityPlayer)null, this.x, this.y, this.z, SoundEvents.ENTITY_GENERIC_EXPLODE, SoundCategory.BLOCKS, 4.0F, (1.0F + (this.world.rand.nextFloat() - this.world.rand.nextFloat()) * 0.2F) * 0.7F);
    if (this.size >= 2.0F && this.damagesTerrain) {
        this.world.spawnParticle(Particles.EXPLOSION_EMITTER, this.x, this.y, this.z, 1.0D, 0.0D, 0.0D);
    } else {
        this.world.spawnParticle(Particles.EXPLOSION, this.x, this.y, this.z, 1.0D, 0.0D, 0.0D);
    }

    Iterator var2;
    BlockPos blockpos;
    if (this.damagesTerrain) {
        var2 = this.affectedBlockPositions.iterator();

        while(var2.hasNext()) {
            blockpos = (BlockPos)var2.next();
            IBlockState iblockstate = this.world.getBlockState(blockpos);
            Block block = iblockstate.getBlock();
            if (p_77279_1_) {
                double d0 = (double)((float)blockpos.getX() + this.world.rand.nextFloat());
                double d1 = (double)((float)blockpos.getY() + this.world.rand.nextFloat());
                double d2 = (double)((float)blockpos.getZ() + this.world.rand.nextFloat());
                double d3 = d0 - this.x;
                double d4 = d1 - this.y;
                double d5 = d2 - this.z;
                double d6 = (double)MathHelper.sqrt(d3 * d3 + d4 * d4 + d5 * d5);
                d3 /= d6;
                d4 /= d6;
                d5 /= d6;
                double d7 = 0.5D / (d6 / (double)this.size + 0.1D);
                d7 *= (double)(this.world.rand.nextFloat() * this.world.rand.nextFloat() + 0.3F);
                d3 *= d7;
                d4 *= d7;
                d5 *= d7;
                this.world.spawnParticle(Particles.POOF, (d0 + this.x) / 2.0D, (d1 + this.y) / 2.0D, (d2 + this.z) / 2.0D, d3, d4, d5);
                this.world.spawnParticle(Particles.SMOKE, d0, d1, d2, d3, d4, d5);
            }

            if (!iblockstate.isAir(this.world, blockpos)) {
                if (block.canDropFromExplosion(this)) {
                    iblockstate.dropBlockAsItemWithChance(this.world, blockpos, 1.0F / this.size, 0);
                }

                iblockstate.onBlockExploded(this.world, blockpos, this);
            }
        }
    }

    if (this.causesFire) {
        var2 = this.affectedBlockPositions.iterator();

        while(var2.hasNext()) {
            blockpos = (BlockPos)var2.next();
            if (this.world.getBlockState(blockpos).isAir(this.world, blockpos) && this.world.getBlockState(blockpos.down()).isOpaqueCube(this.world, blockpos.down()) && this.random.nextInt(3) == 0) {
                this.world.setBlockState(blockpos, Blocks.FIRE.getDefaultState());
            }
        }
    }

}

Can someone give me an explained version of this code as comments because I want to create a custom explosion thing