Alright, so I have made many posts about how I could make a new ability on a pickaxe, and I found it!

but the problem is that I do not know how to check what item is in your hand! Please tell me what I need to have for me to be able to access that command, and where I should put it: load() method, or another method that I would have to make?

I think you need to put it in a class which mplements ITickHandler.

http://www.minecraftforge.net/wiki/Tutorials/Upgrading_To_Forge_for_1.3.1#Ticking

this should explain how to make a client ticker.

then all you need to do is add a new method to the clientTicker.

public Item getCurrentItemEquipped(EntityPlayer entityplayer) throws NullPointerException{
        return entityplayer.inventory.getCurrentItem().getItem();    
    }

and add this to the onTickInGame method:

EntityClientPlayerMP player = Minecraft.getMinecraft().thePlayer;
Item item = getCurrentItemEquipped(player);
if(item != null){
        if(item.shiftedIndex == "Your Item ID"){
                //Perfom Action
        }
}

alright, so I did that and now when I do it I added a method for the ability and one for the item, so the Console says Using item with ability ability

ERROR MESSAGE

 

2012-10-17 15:50:56 [iNFO] [sTDOUT] MinecraftForge v4.0.0.200 Initialized

Using item.AdvBloodstonePickaxe With Flame

2012-10-17 15:50:57 [iNFO] [sTDERR] java.lang.NullPointerException

2012-10-17 15:50:57 [iNFO] [sTDERR] at net.minecraft.src.RenderItem.doRenderItem(RenderItem.java:101)

2012-10-17 15:50:57 [iNFO] [sTDERR] at net.minecraft.src.RenderItem.doRender(RenderItem.java:415)

2012-10-17 15:50:57 [iNFO] [sTDERR] at net.minecraft.src.RenderManager.renderEntityWithPosYaw(RenderManager.java:188)

2012-10-17 15:50:57 [iNFO] [sTDERR] at net.minecraft.src.RenderManager.renderEntity(RenderManager.java:175)

2012-10-17 15:50:57 [iNFO] [sTDERR] at net.minecraft.src.RenderGlobal.renderEntities(RenderGlobal.java:434)

2012-10-17 15:50:57 [iNFO] [sTDERR] at net.minecraft.src.EntityRenderer.renderWorld(EntityRenderer.java:1037)

2012-10-17 15:50:57 [iNFO] [sTDERR] at net.minecraft.src.EntityRenderer.updateCameraAndRender(EntityRenderer.java:898)

2012-10-17 15:50:57 [iNFO] [sTDERR] at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:868)

2012-10-17 15:50:57 [iNFO] [sTDERR] at net.minecraft.client.Minecraft.run(Minecraft.java:761)

2012-10-17 15:50:57 [iNFO] [sTDERR] at java.lang.Thread.run(Unknown Source)

2012-10-17 15:51:07 [iNFO] [sTDOUT] Stopping!

2012-10-17 15:51:07 [iNFO] [sTDOUT] SoundSystem shutting down...

2012-10-17 15:51:07 [iNFO] [sTDOUT]    Author: Paul Lamb, www.paulscode.com

2012-10-17 15:51:19 [iNFO] [sTDERR] Someone is closing me!

 

 

Alright, so the code I have is:

package korcraft;

import net.minecraft.src.Block;
import net.minecraft.src.EntityItem;
import net.minecraft.src.EntityPlayer;
import net.minecraft.src.EnumToolMaterial;
import net.minecraft.src.InventoryPlayer;
import net.minecraft.src.Item;
import net.minecraft.src.ItemStack;
import net.minecraft.src.ItemTool;
import net.minecraft.src.Material;

public class ItemPickaxe extends ItemTool {

public static final Block[] blocksEffectiveAgainst = new Block[] {Block.cobblestone, Block.stoneDoubleSlab, Block.stoneSingleSlab, Block.stone, Block.sandStone, Block.cobblestoneMossy, Block.oreIron, Block.blockSteel, Block.oreCoal, Block.blockGold, Block.oreGold, Block.oreDiamond, Block.blockDiamond, Block.ice, Block.netherrack, Block.oreLapis, Block.blockLapis, Block.oreRedstone, Block.oreRedstoneGlowing, Block.rail, Block.railDetector, Block.railPowered};

public boolean canHarvestBlock(Block par1Block){
        return par1Block == Block.obsidian ? this.toolMaterial.getHarvestLevel() == 3 : (par1Block != Block.blockDiamond && par1Block != Block.oreDiamond ? (par1Block == Block.oreEmerald ? this.toolMaterial.getHarvestLevel() >= 2 : (par1Block != Block.blockGold && par1Block != Block.oreGold ? (par1Block != Block.blockSteel && par1Block != Block.oreIron ? (par1Block != Block.blockLapis && par1Block != Block.oreLapis ? (par1Block != Block.oreRedstone && par1Block != Block.oreRedstoneGlowing ? (par1Block.blockMaterial == Material.rock ? true : par1Block.blockMaterial == Material.iron) : this.toolMaterial.getHarvestLevel() >= 2) : this.toolMaterial.getHarvestLevel() >= 1) : this.toolMaterial.getHarvestLevel() >= 1) : this.toolMaterial.getHarvestLevel() >= 2)) : this.toolMaterial.getHarvestLevel() >= 2);
    }

public ItemPickaxe(int par1, EnumToolMaterial par2EnumToolMaterial){
        super(par1, 2, par2EnumToolMaterial, blocksEffectiveAgainst);
    }

public float getStrVsBlock(ItemStack par1ItemStack, Block par2Block){
        return par2Block != null && (par2Block.blockMaterial == Material.iron || par2Block.blockMaterial == Material.rock) ? this.efficiencyOnProperMaterial : super.getStrVsBlock(par1ItemStack, par2Block);
}
public String getTextureFile() {
	return "/KorCraftTextures/Items.png";
}
static String pickaxeAbility = "";
public void test(){
	System.out.println("Working");
}
/**
 * Ability Finder based on current item in inventory
 */
public static String getPickaxeAbility(EntityPlayer entityplayer){
	if(entityplayer.inventory.getCurrentItem().getItem()==KorCraftBase.AdvBloodstonePick){
		return "Flame";
	}else if(entityplayer.inventory.getCurrentItem().getItem()==KorCraftBase.AdvDiopsidePick){
		return "Speed";
	}else if(entityplayer.inventory.getCurrentItem().getItem()==KorCraftBase.AdvKyanitePick){
		return "Silktouch";
	}else if(entityplayer.inventory.getCurrentItem().getItem()==KorCraftBase.AdvSapphirePick){
		return "Fortune";
	}
	return "";
}
public boolean onBlockStartBreak(ItemStack itemstack, int x, int y, int z, EntityPlayer entityplayer)
 {
	String currentItem = entityplayer.inventory.getCurrentItem().getItemName();
	String currentAbility = ItemPickaxe.getPickaxeAbility(entityplayer);
  System.out.println("Using " + currentItem + "\twith ability " + currentAbility);
	int getID = entityplayer.worldObj.getBlockId(x,y,z);	  //Finding block
	if(currentAbility == "Flame")
	{
	  if (getID == Block.oreIron.blockID || getID == Block.oreGold.blockID || getID == Block.stone.blockID || getID == Block.wood.blockID)
	  {
		  EntityItem flamed = new EntityItem(null);
		  if(getID == Block.oreIron.blockID)
		  {
			  flamed = new EntityItem(entityplayer.worldObj, x, y, z, new ItemStack(Item.ingotIron, 1, entityplayer.worldObj.getBlockMetadata(x, y, z)));
			  flamed.delayBeforeCanPickup = 10;
			  entityplayer.worldObj.spawnEntityInWorld(flamed);
		  }else if(getID == Block.oreGold.blockID)
		  {
			  flamed = new EntityItem(entityplayer.worldObj, x, y, z, new ItemStack(Item.ingotGold, 1, entityplayer.worldObj.getBlockMetadata(x, y, z)));
			  flamed.delayBeforeCanPickup = 10;
			  entityplayer.worldObj.spawnEntityInWorld(flamed);
		  }else if(getID == Block.stone.blockID)
		  {
			  flamed = new EntityItem(entityplayer.worldObj, x, y, z, new ItemStack(Block.stone, 1, entityplayer.worldObj.getBlockMetadata(x, y, z)));
			  flamed.delayBeforeCanPickup = 10;
			  entityplayer.worldObj.spawnEntityInWorld(flamed);
		  }else if(getID == Block.wood.blockID)
		  {
			  flamed = new EntityItem(entityplayer.worldObj, x, y, z, new ItemStack(Item.coal.getMetadata(1), 1, entityplayer.worldObj.getBlockMetadata(x, y, z)));
			  flamed.delayBeforeCanPickup = 10;
			  entityplayer.worldObj.spawnEntityInWorld(flamed);
		  }
	  }
   return true;
  }
  return false;
 }
}