Chnage Item Code

public void changeItem() {
		int heat = this.getSlot(0).getStack().getItemDamage();
		if(this.buttonPressed != -1) {
	        if(this.inputSlot.getStackInSlot(0).isItemEqualIgnoreDurability(new ItemStack(ItemInit.HOT_TOOL_HEAD))) {
	        	int weapon = this.buttonPressed;
	        	if(weapon == 1) {
	        		ItemStack stack = new ItemStack(ItemInit.DAGGER_HOT_TOOL_HEAD);
	        		stack.setItemDamage(heat);
	        		this.inputSlot.decrStackSize(0, 1);
        			player.addItemStackToInventory(stack);
	        		//this.outputSlot.setInventorySlotContents(1, stack);
	        		//this.outputSlot.getStackInSlot(1).setItemDamage(heat);
	        	}else if(weapon == 2) {
	        		ItemStack stack = new ItemStack(ItemInit.KABUTOWARI_HOT_TOOL_HEAD);
	        		stack.setItemDamage(heat);
	        		this.inputSlot.decrStackSize(0, 1);
        			player.addItemStackToInventory(stack);
	        	}else if(weapon == 3) {
	        		ItemStack stack = new ItemStack(ItemInit.TALWAR_HOT_TOOL_HEAD);
	        		stack.setItemDamage(heat);
	        		this.inputSlot.decrStackSize(0, 1);
        			player.addItemStackToInventory(stack);
	        	}else if(weapon == 4) {
	        		ItemStack stack = new ItemStack(ItemInit.RAPIER_HOT_TOOL_HEAD);
	        		stack.setItemDamage(heat);
	        		this.inputSlot.decrStackSize(0, 1);
        			player.addItemStackToInventory(stack);
	        	}else {
	        		ItemStack result = AnvilRecipes.getInstance().getForgingResult(this.inputSlot.getStackInSlot(0));
	        		this.outputStack = result;
	        		System.out.print("RESULT IS: " + result.getDisplayName());
	        		this.inputSlot.clear();
	        		this.outputSlot.setInventorySlotContents(1, result);
	        	}
	        	this.buttonPressed = -1;
	        }
		}
	}