Hi fellow modders,

me and my friend Dautor are making a mod,

and it needs to include a custom furnace with 2,3 and 4 outputs.

All different ones to be clear. We have made the code

for the basic 1 output furnace, and have experimented

with the 2. output slot but could not get it to work.

The 1 output works great!

Container

package core.base.container;

import core.base.ElectrolyzerRecipes;
import core.base.TileEntityElectrolyzer;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.player.InventoryPlayer;
import net.minecraft.inventory.Container;
import net.minecraft.inventory.ICrafting;
import net.minecraft.inventory.Slot;
import net.minecraft.inventory.SlotElectrolyzer;
import net.minecraft.item.ItemStack;
import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;

public class ContainerElectrolyzer extends Container
{
    private TileEntityElectrolyzer furnace;
    private int lastCookTime;
    private int lastBurnTime;
    private int lastItemBurnTime;

    public ContainerElectrolyzer(InventoryPlayer par1InventoryPlayer, TileEntityElectrolyzer par2TileEntityElectrolyzer)
    {
        this.furnace = par2TileEntityElectrolyzer;
        this.addSlotToContainer(new Slot(par2TileEntityElectrolyzer, 0, 56, 17));
        this.addSlotToContainer(new Slot(par2TileEntityElectrolyzer, 1, 56, 53));
        this.addSlotToContainer(new SlotElectrolyzer(par1InventoryPlayer.player, par2TileEntityElectrolyzer, 2, 116, 35));
        int i;

        for (i = 0; i < 3; ++i)
        {
            for (int j = 0; j < 9; ++j)
            {
                this.addSlotToContainer(new Slot(par1InventoryPlayer, j + i * 9 + 9, 8 + j * 18, 84 + i * 18));
            }
        }

        for (i = 0; i < 9; ++i)
        {
            this.addSlotToContainer(new Slot(par1InventoryPlayer, i, 8 + i * 18, 142));
        }
    }

    public void addCraftingToCrafters(ICrafting par1ICrafting)
    {
        super.addCraftingToCrafters(par1ICrafting);
        par1ICrafting.sendProgressBarUpdate(this, 0, this.furnace.furnaceCookTime);
        par1ICrafting.sendProgressBarUpdate(this, 1, this.furnace.furnaceBurnTime);
        par1ICrafting.sendProgressBarUpdate(this, 2, this.furnace.currentItemBurnTime);
    }

    /**
     * Looks for changes made in the container, sends them to every listener.
     */
    public void detectAndSendChanges()
    {
        super.detectAndSendChanges();

        for (int i = 0; i < this.crafters.size(); ++i)
        {
            ICrafting icrafting = (ICrafting)this.crafters.get(i);

            if (this.lastCookTime != this.furnace.furnaceCookTime)
            {
                icrafting.sendProgressBarUpdate(this, 0, this.furnace.furnaceCookTime);
            }

            if (this.lastBurnTime != this.furnace.furnaceBurnTime)
            {
                icrafting.sendProgressBarUpdate(this, 1, this.furnace.furnaceBurnTime);
            }

            if (this.lastItemBurnTime != this.furnace.currentItemBurnTime)
            {
                icrafting.sendProgressBarUpdate(this, 2, this.furnace.currentItemBurnTime);
            }
        }

        this.lastCookTime = this.furnace.furnaceCookTime;
        this.lastBurnTime = this.furnace.furnaceBurnTime;
        this.lastItemBurnTime = this.furnace.currentItemBurnTime;
    }

    @SideOnly(Side.CLIENT)
    public void updateProgressBar(int par1, int par2)
    {
        if (par1 == 0)
        {
            this.furnace.furnaceCookTime = par2;
        }

        if (par1 == 1)
        {
            this.furnace.furnaceBurnTime = par2;
        }

        if (par1 == 2)
        {
            this.furnace.currentItemBurnTime = par2;
        }
    }

    public boolean canInteractWith(EntityPlayer par1EntityPlayer)
    {
        return this.furnace.isUseableByPlayer(par1EntityPlayer);
    }

    /**
     * Called when a player shift-clicks on a slot. You must override this or you will crash when someone does that.
     */
    public ItemStack transferStackInSlot(EntityPlayer par1EntityPlayer, int par2)
    {
        ItemStack itemstack = null;
        Slot slot = (Slot)this.inventorySlots.get(par2);

        if (slot != null && slot.getHasStack())
        {
            ItemStack itemstack1 = slot.getStack();
            itemstack = itemstack1.copy();

            if (par2 == 2)
            {
                if (!this.mergeItemStack(itemstack1, 3, 39, true))
                {
                    return null;
                }

                slot.onSlotChange(itemstack1, itemstack);
            }
            else if (par2 != 1 && par2 != 0)
            {
                if (ElectrolyzerRecipes.smelting().getSmeltingResult(itemstack1) != null)
                {
                    if (!this.mergeItemStack(itemstack1, 0, 1, false))
                    {
                        return null;
                    }
                }
                else if (TileEntityElectrolyzer.isItemFuel(itemstack1))
                {
                    if (!this.mergeItemStack(itemstack1, 1, 2, false))
                    {
                        return null;
                    }
                }
                else if (par2 >= 3 && par2 < 30)
                {
                    if (!this.mergeItemStack(itemstack1, 30, 39, false))
                    {
                        return null;
                    }
                }
                else if (par2 >= 30 && par2 < 39 && !this.mergeItemStack(itemstack1, 3, 30, false))
                {
                    return null;
                }
            }
            else if (!this.mergeItemStack(itemstack1, 3, 39, false))
            {
                return null;
            }

            if (itemstack1.stackSize == 0)
            {
                slot.putStack((ItemStack)null);
            }
            else
            {
                slot.onSlotChanged();
            }

            if (itemstack1.stackSize == itemstack.stackSize)
            {
                return null;
            }

            slot.onPickupFromSlot(par1EntityPlayer, itemstack1);
        }

        return itemstack;
    }
}

TileEntity

package core.base;

import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.inventory.ISidedInventory;
import net.minecraft.item.Item;
import net.minecraft.item.ItemBlock;
import net.minecraft.item.ItemHoe;
import net.minecraft.item.ItemStack;
import net.minecraft.item.ItemSword;
import net.minecraft.item.ItemTool;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.nbt.NBTTagList;
import net.minecraft.tileentity.TileEntity;
import cpw.mods.fml.common.registry.GameRegistry;
import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;

public class TileEntityElectrolyzer extends TileEntity implements ISidedInventory
{
    private static final int[] slots_top = new int[] {0};
    private static final int[] slots_bottom = new int[] {2, 1};
    private static final int[] slots_sides = new int[] {1};

    /**
     * The ItemStacks that hold the items currently being used in the furnace
     */
    private ItemStack[] furnaceItemStacks = new ItemStack[3];

    /** The number of ticks that the furnace will keep burning */
    public int furnaceBurnTime;

    /**
     * The number of ticks that a fresh copy of the currently-burning item would keep the furnace burning for
     */
    public int currentItemBurnTime;

    /** The number of ticks that the current item has been cooking for */
    public int furnaceCookTime;
    private String field_94130_e;

    /**
     * Returns the number of slots in the inventory.
     */
    public int getSizeInventory()
    {
        return this.furnaceItemStacks.length;
    }

    /**
     * Returns the stack in slot i
     */
    public ItemStack getStackInSlot(int par1)
    {
        return this.furnaceItemStacks[par1];
    }

    /**
     * Removes from an inventory slot (first arg) up to a specified number (second arg) of items and returns them in a
     * new stack.
     */
    public ItemStack decrStackSize(int par1, int par2)
    {
        if (this.furnaceItemStacks[par1] != null)
        {
            ItemStack itemstack;

            if (this.furnaceItemStacks[par1].stackSize <= par2)
            {
                itemstack = this.furnaceItemStacks[par1];
                this.furnaceItemStacks[par1] = null;
                return itemstack;
            }
            else
            {
                itemstack = this.furnaceItemStacks[par1].splitStack(par2);

                if (this.furnaceItemStacks[par1].stackSize == 0)
                {
                    this.furnaceItemStacks[par1] = null;
                }

                return itemstack;
            }
        }
        else
        {
            return null;
        }
    }

    /**
     * When some containers are closed they call this on each slot, then drop whatever it returns as an EntityItem -
     * like when you close a workbench GUI.
     */
    public ItemStack getStackInSlotOnClosing(int par1)
    {
        if (this.furnaceItemStacks[par1] != null)
        {
            ItemStack itemstack = this.furnaceItemStacks[par1];
            this.furnaceItemStacks[par1] = null;
            return itemstack;
        }
        else
        {
            return null;
        }
    }

    /**
     * Sets the given item stack to the specified slot in the inventory (can be crafting or armor sections).
     */
    public void setInventorySlotContents(int par1, ItemStack par2ItemStack)
    {
        this.furnaceItemStacks[par1] = par2ItemStack;

        if (par2ItemStack != null && par2ItemStack.stackSize > this.getInventoryStackLimit())
        {
            par2ItemStack.stackSize = this.getInventoryStackLimit();
        }
    }

    /**
     * Returns the name of the inventory.
     */
    public String getInvName()
    {
        return this.isInvNameLocalized() ? this.field_94130_e : "container.furnace";
    }

    /**
     * If this returns false, the inventory name will be used as an unlocalized name, and translated into the player's
     * language. Otherwise it will be used directly.
     */
    public boolean isInvNameLocalized()
    {
        return this.field_94130_e != null && this.field_94130_e.length() > 0;
    }

    /**
     * Sets the custom display name to use when opening a GUI linked to this tile entity.
     */
    public void setGuiDisplayName(String par1Str)
    {
        this.field_94130_e = par1Str;
    }

    /**
     * Reads a tile entity from NBT.
     */
    public void readFromNBT(NBTTagCompound par1NBTTagCompound)
    {
        super.readFromNBT(par1NBTTagCompound);
        NBTTagList nbttaglist = par1NBTTagCompound.getTagList("Items");
        this.furnaceItemStacks = new ItemStack[this.getSizeInventory()];

        for (int i = 0; i < nbttaglist.tagCount(); ++i)
        {
            NBTTagCompound nbttagcompound1 = (NBTTagCompound)nbttaglist.tagAt(i);
            byte b0 = nbttagcompound1.getByte("Slot");

            if (b0 >= 0 && b0 < this.furnaceItemStacks.length)
            {
                this.furnaceItemStacks[b0] = ItemStack.loadItemStackFromNBT(nbttagcompound1);
            }
        }

        this.furnaceBurnTime = par1NBTTagCompound.getShort("BurnTime");
        this.furnaceCookTime = par1NBTTagCompound.getShort("CookTime");
        this.currentItemBurnTime = getItemBurnTime(this.furnaceItemStacks[1]);

        if (par1NBTTagCompound.hasKey("CustomName"))
        {
            this.field_94130_e = par1NBTTagCompound.getString("CustomName");
        }
    }

    /**
     * Writes a tile entity to NBT.
     */
    public void writeToNBT(NBTTagCompound par1NBTTagCompound)
    {
        super.writeToNBT(par1NBTTagCompound);
        par1NBTTagCompound.setShort("BurnTime", (short)this.furnaceBurnTime);
        par1NBTTagCompound.setShort("CookTime", (short)this.furnaceCookTime);
        NBTTagList nbttaglist = new NBTTagList();

        for (int i = 0; i < this.furnaceItemStacks.length; ++i)
        {
            if (this.furnaceItemStacks[i] != null)
            {
                NBTTagCompound nbttagcompound1 = new NBTTagCompound();
                nbttagcompound1.setByte("Slot", (byte)i);
                this.furnaceItemStacks[i].writeToNBT(nbttagcompound1);
                nbttaglist.appendTag(nbttagcompound1);
            }
        }

        par1NBTTagCompound.setTag("Items", nbttaglist);

        if (this.isInvNameLocalized())
        {
            par1NBTTagCompound.setString("CustomName", this.field_94130_e);
        }
    }

    /**
     * Returns the maximum stack size for a inventory slot. Seems to always be 64, possibly will be extended. *Isn't
     * this more of a set than a get?*
     */
    public int getInventoryStackLimit()
    {
        return 64;
    }

    @SideOnly(Side.CLIENT)

    /**
     * Returns an integer between 0 and the passed value representing how close the current item is to being completely
     * cooked
     */
    public int getCookProgressScaled(int par1)
    {
        return this.furnaceCookTime * par1 / 200;
    }

    @SideOnly(Side.CLIENT)

    /**
     * Returns an integer between 0 and the passed value representing how much burn time is left on the current fuel
     * item, where 0 means that the item is exhausted and the passed value means that the item is fresh
     */
    public int getBurnTimeRemainingScaled(int par1)
    {
        if (this.currentItemBurnTime == 0)
        {
            this.currentItemBurnTime = 200;
        }

        return this.furnaceBurnTime * par1 / this.currentItemBurnTime;
    }

    /**
     * Returns true if the furnace is currently burning
     */
    public boolean isBurning()
    {
        return this.furnaceBurnTime > 0;
    }

    /**
     * Allows the entity to update its state. Overridden in most subclasses, e.g. the mob spawner uses this to count
     * ticks and creates a new spawn inside its implementation.
     */
    public void updateEntity()
    {
        boolean flag = this.furnaceBurnTime > 0;
        boolean flag1 = false;

        if (this.furnaceBurnTime > 0)
        {
            --this.furnaceBurnTime;
        }

        if (!this.worldObj.isRemote)
        {
            if (this.furnaceBurnTime == 0 && this.canSmelt())
            {
                this.currentItemBurnTime = this.furnaceBurnTime = getItemBurnTime(this.furnaceItemStacks[1]);

                if (this.furnaceBurnTime > 0)
                {
                    flag1 = true;

                    if (this.furnaceItemStacks[1] != null)
                    {
                        --this.furnaceItemStacks[1].stackSize;

                        if (this.furnaceItemStacks[1].stackSize == 0)
                        {
                            this.furnaceItemStacks[1] = this.furnaceItemStacks[1].getItem().getContainerItemStack(furnaceItemStacks[1]);
                        }
                    }
                }
            }

            if (this.isBurning() && this.canSmelt())
            {
                ++this.furnaceCookTime;

                if (this.furnaceCookTime == 200)
                {
                    this.furnaceCookTime = 0;
                    this.smeltItem();
                    flag1 = true;
                }
            }
            else
            {
                this.furnaceCookTime = 0;
            }

            if (flag != this.furnaceBurnTime > 0)
            {
                flag1 = true;
                BlockElectrolyzer.updateFurnaceBlockState(this.furnaceBurnTime > 0, this.worldObj, this.xCoord, this.yCoord, this.zCoord);
            }
        }

        if (flag1)
        {
            this.onInventoryChanged();
        }
    }

    /**
     * Returns true if the furnace can smelt an item, i.e. has a source item, destination stack isn't full, etc.
     */
    private boolean canSmelt()
    {
        if (this.furnaceItemStacks[0] == null)
        {
            return false;
        }
        else
        {
            ItemStack itemstack = ElectrolyzerRecipes.smelting().getSmeltingResult(this.furnaceItemStacks[0]);
            if (itemstack == null) return false;
            if (this.furnaceItemStacks[2] == null) return true;
            if (!this.furnaceItemStacks[2].isItemEqual(itemstack)) return false;
            int result = furnaceItemStacks[2].stackSize + itemstack.stackSize;
            return (result <= getInventoryStackLimit() && result <= itemstack.getMaxStackSize());
        }
    }

    /**
     * Turn one item from the furnace source stack into the appropriate smelted item in the furnace result stack
     */
    public void smeltItem()
    {
        if (this.canSmelt())
        {
            ItemStack itemstack = ElectrolyzerRecipes.smelting().getSmeltingResult(this.furnaceItemStacks[0]);

            if (this.furnaceItemStacks[2] == null)
            {
                this.furnaceItemStacks[2] = itemstack.copy();
            }
            else if (this.furnaceItemStacks[2].isItemEqual(itemstack))
            {
                furnaceItemStacks[2].stackSize += itemstack.stackSize;
            }

            --this.furnaceItemStacks[0].stackSize;

            if (this.furnaceItemStacks[0].stackSize <= 0)
            {
                this.furnaceItemStacks[0] = null;
            }
        }
    }

    /**
     * Returns the number of ticks that the supplied fuel item will keep the furnace burning, or 0 if the item isn't
     * fuel
     */
    public static int getItemBurnTime(ItemStack par0ItemStack)
    {
        if (par0ItemStack == null)
        {
            return 0;
        }
        else
        {
            int i = par0ItemStack.getItem().itemID;
            Item item = par0ItemStack.getItem();

            if (par0ItemStack.getItem() instanceof ItemBlock && Block.blocksList[i] != null)
            {
                Block block = Block.blocksList[i];

                if (block == Block.woodSingleSlab)
                {
                    return 150;
                }

                if (block.blockMaterial == Material.wood)
                {
                    return 300;
                }

                if (block == Block.coalBlock)
                {
                    return 16000;
                }
                
                if (block == Block.blockEmerald)
                {
                    return 3300000;
                }
            }

            if (item instanceof ItemTool && ((ItemTool) item).getToolMaterialName().equals("WOOD")) return 200;
            if (item instanceof ItemSword && ((ItemSword) item).getToolMaterialName().equals("WOOD")) return 200;
            if (item instanceof ItemHoe && ((ItemHoe) item).getMaterialName().equals("WOOD")) return 200;
            if (i == Item.stick.itemID) return 100;
            if (i == Item.coal.itemID) return 1600;
            if (i == Item.bucketLava.itemID) return 20000;
            if (i == Block.sapling.blockID) return 100;
            if (i == Item.blazeRod.itemID) return 2400;
            return GameRegistry.getFuelValue(par0ItemStack);
        }
    }

    /**
     * Return true if item is a fuel source (getItemBurnTime() > 0).
     */
    public static boolean isItemFuel(ItemStack par0ItemStack)
    {
        return getItemBurnTime(par0ItemStack) > 0;
    }

    /**
     * Do not make give this method the name canInteractWith because it clashes with Container
     */
    public boolean isUseableByPlayer(EntityPlayer par1EntityPlayer)
    {
        return this.worldObj.getBlockTileEntity(this.xCoord, this.yCoord, this.zCoord) != this ? false : par1EntityPlayer.getDistanceSq((double)this.xCoord + 0.5D, (double)this.yCoord + 0.5D, (double)this.zCoord + 0.5D) <= 64.0D;
    }

    public void openChest() {}

    public void closeChest() {}

    /**
     * Returns true if automation is allowed to insert the given stack (ignoring stack size) into the given slot.
     */
    public boolean isItemValidForSlot(int par1, ItemStack par2ItemStack)
    {
        return par1 == 2 ? false : (par1 == 1 ? isItemFuel(par2ItemStack) : true);
    }

    /**
     * Returns an array containing the indices of the slots that can be accessed by automation on the given side of this
     * block.
     */
    public int[] getAccessibleSlotsFromSide(int par1)
    {
        return par1 == 0 ? slots_bottom : (par1 == 1 ? slots_top : slots_sides);
    }

    /**
     * Returns true if automation can insert the given item in the given slot from the given side. Args: Slot, item,
     * side
     */
    public boolean canInsertItem(int par1, ItemStack par2ItemStack, int par3)
    {
        return this.isItemValidForSlot(par1, par2ItemStack);
    }

    /**
     * Returns true if automation can extract the given item in the given slot from the given side. Args: Slot, item,
     * side
     */
    public boolean canExtractItem(int par1, ItemStack par2ItemStack, int par3)
    {
        return par3 != 0 || par1 != 1 || par2ItemStack.itemID == Item.bucketEmpty.itemID;
    }
}

 

Thanks for reading this!(And if u help, for helping too OFC  )

Sincerely Dautor and Nicba1010

i've seen sth about dual hashmaps.

any1 know how that would go

Sry forgot the recipe code.

Recipe

package core.base;

import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import net.minecraft.block.Block;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;

public class ElectrolyzerRecipes
{
    private static final ElectrolyzerRecipes smeltingBase = new ElectrolyzerRecipes();

    /** The list of smelting results. */
    private Map smeltingList = new HashMap();
    private Map experienceList = new HashMap();
    private HashMap<List<Integer>, ItemStack> metaSmeltingList = new HashMap<List<Integer>, ItemStack>();
    private HashMap<List<Integer>, Float> metaExperience = new HashMap<List<Integer>, Float>();

    /**
     * Used to call methods addSmelting and getSmeltingResult.
     */
    public static final ElectrolyzerRecipes smelting()
    {
        return smeltingBase;
    }

    private ElectrolyzerRecipes()
    {
        this.addSmelting(Block.oreIron.blockID, new ItemStack(Item.diamond), 100F);    }

    /**
     * Adds a smelting recipe.
     */
    public void addSmelting(int par1, ItemStack par2ItemStack, float par3)
    {
        this.smeltingList.put(Integer.valueOf(par1), par2ItemStack);
        this.experienceList.put(Integer.valueOf(par2ItemStack.itemID), Float.valueOf(par3));
    }

    /**
     * Returns the smelting result of an item.
     * Deprecated in favor of a metadata sensitive version
     */
    @Deprecated
    public ItemStack getSmeltingResult(int par1)
    {
        return (ItemStack)this.smeltingList.get(Integer.valueOf(par1));
    }

    public Map getSmeltingList()
    {
        return this.smeltingList;
    }

    @Deprecated //In favor of ItemStack sensitive version
    public float getExperience(int par1)
    {
        return this.experienceList.containsKey(Integer.valueOf(par1)) ? ((Float)this.experienceList.get(Integer.valueOf(par1))).floatValue() : 0.0F;
    }

    /**
     * A metadata sensitive version of adding a furnace recipe.
     */
    public void addSmelting(int itemID, int metadata, ItemStack itemstack, float experience)
    {
        metaSmeltingList.put(Arrays.asList(itemID, metadata), itemstack);
        metaExperience.put(Arrays.asList(itemstack.itemID, itemstack.getItemDamage()), experience);
    }

    /**
     * Used to get the resulting ItemStack form a source ItemStack
     * @param item The Source ItemStack
     * @return The result ItemStack
     */
    public ItemStack getSmeltingResult(ItemStack item) 
    {
        if (item == null)
        {
            return null;
        }
        ItemStack ret = (ItemStack)metaSmeltingList.get(Arrays.asList(item.itemID, item.getItemDamage()));
        if (ret != null) 
        {
            return ret;
        }
        return (ItemStack)smeltingList.get(Integer.valueOf(item.itemID));
    }

    /**
     * Grabs the amount of base experience for this item to give when pulled from the furnace slot.
     */
    public float getExperience(ItemStack item)
    {
        if (item == null || item.getItem() == null)
        {
            return 0;
        }
        float ret = item.getItem().getSmeltingExperience(item);
        if (ret < 0 && metaExperience.containsKey(Arrays.asList(item.itemID, item.getItemDamage())))
        {
            ret = metaExperience.get(Arrays.asList(item.itemID, item.getItemDamage()));
        }
        if (ret < 0 && experienceList.containsKey(item.itemID))
        {
            ret = ((Float)experienceList.get(item.itemID)).floatValue();
        }
        return (ret < 0 ? 0 : ret);
    }

    public Map<List<Integer>, ItemStack> getMetaSmeltingList()
    {
        return metaSmeltingList;
    }
}

I solved it myself. I think I may gonna make a tutorial!