This is a set of Minecraft Java mods that we have built in ModderDojo, which is part of CoderDojo Athenry. Contact us on Twitter at @coderdojoathenr. All of these mods require Forge 1.7.2 or higher.

To install a mod, download the Jar file from here, then go to your %APPDATA% folder, then open the .minecraft folder, and place the Jar file in the Mods folder.

More Ways To Minecraft by Ruaidhri:

New items: blue, red and green lightsabers and a ruby. New recipes to create lightsabers.

Download: https://www.dropbox.com/s/sn5cxkobjsfmlix/more%20ways%20to%20minecraft-1.0.jar

Money Mod by Luke:

New items: multiple coins and notes and a credit card. New recipes to create one type from another.

Download: https://www.dropbox.com/s/8lhhj5rnjiy2agp/Money%20mod-1.0.jar

More coming!

As discussed at this week’s session, we will be awarding belts on Saturday 12 April. In advance of that, Modders should work on developing as good a mod as possible, in either Java or JavaScript. I can help you publish your mod to the CoderDojo Athenry website, so  get in touch with me (Michael) by email if you have questions.

Here are the notes in PDF format about how to earn a belt: Modding-PrepareForBelts.

Overview

Here is all of the code for our mods to define our first item, first block, and first recipe. In addition to 3 Java files, there is 1 language resource file (en_US.lang) and also 2 PNG files that are not included below: one for the block texture and one for the item texture.

Refer to the image below and to earlier posts in this series to see how these files should be arranged in a package.

MyFirstItem.java

// Michael Madden Feb 2014.
// Ref: http://www.minecraftforge.net/wiki/Basic_Items 
// And: https://cdathenry.wordpress.com/2014/02/15/modderdojo-java-modding-8-a-simple-item-mod/ 

package modderdojo.firstitem;

import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.item.Item;

public class MyFirstItem extends Item 
{
 public MyFirstItem() 
 {
 // This is the constructor for our new item. Set basic properties in it.
 setMaxStackSize(64);
 setCreativeTab(CreativeTabs.tabTransport);
 setUnlocalizedName("MichaelFirstItem"); 
 }
}

MyFirstBlock.java

// Michael Madden March 2014.

// Ref: http://www.minecraftforge.net/wiki/Basic_Items
// And: https://cdathenry.wordpress.com/2014/03/29/modderdojo-java-modding-12-creating-our-first-block/

// Thanks to Ailish and Eli in CoderDojo Athenry who figured this out originally. 

package modderdojo.firstitem;

import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraft.creativetab.CreativeTabs;

public class MyFirstBlock extends Block 
{
 public MyFirstBlock() 
 {
 // This is the constructor for our new item. Set basic properties in it.
 super(Material.iron); // Copy the properties of iron
 
 setCreativeTab(CreativeTabs.tabBlock);
 setBlockName("MichaelFirstBlock"); // This is the internal name, not display name
 }
}

MyFirstMod.java

// Michael Madden, March 2014.
// Registers an Item mod and a Block mod and creates a recipe.
// Ref: https://cdathenry.wordpress.com/2014/01/19/modderdojo-java-modding-6-creating-our-first-mod-adding-a-crafting-recipe/
// And: https://cdathenry.wordpress.com/category/modderdojo/

package modderdojo.firstitem;

import net.minecraft.init.Blocks;
import net.minecraft.init.Items;
import net.minecraft.item.Item;

import net.minecraft.item.ItemStack;
import cpw.mods.fml.common.Mod;
import cpw.mods.fml.common.Mod.EventHandler;
import cpw.mods.fml.common.event.FMLPreInitializationEvent;
import cpw.mods.fml.common.registry.GameRegistry;

@Mod(modid = "firstitem", name = "First Mod from ModderDojo by Michael", version = "1.0")
public class MyFirstMod
{
 @EventHandler
 public void preInit(FMLPreInitializationEvent event) 
 {
 // Register my item and set its texture
 MyFirstItem first = new MyFirstItem();
 first.setTextureName("modderdojo:md2");
 GameRegistry.registerItem(first, "MichaelFirstItem"); // This name doesn't have to be same as unlocalised name, but no harm in them being the same
 
 // Register my block and set its texture
 MyFirstBlock b = new MyFirstBlock();
 b.setBlockTextureName("modderdojo:mmblock"); // requires .png file with this name
 GameRegistry.registerBlock(b, "MichaelFirstBlock");
 
 // Add recipe to turn 2 of my items into diamond
 ItemStack myStack = new ItemStack(first);
 ItemStack diamond = new ItemStack(Items.diamond, 1);
 
 GameRegistry.addRecipe(diamond, 
 "x ", // 2x2 recipe
 " x", 
 'x', first);
 }
}

en_US.lang

item.MichaelFirstItem.name=Nice Name For Michael's First Item
tile.MichaelFirstBlock.name=Michael's First Block Display Name

Getting Started

IMPORTANT: For this block mod code to work, you need at least release 1024 of Forge 1.7.2. It will not work with releases 999 that we downloaded before. (Explanation: Forge works by decompiling the Minecraft code, which gives fields and methods automatic names like func_149739_a(). The Forge people have to translate these into meaningful names, like getUnlocalizedName(). They had not done this for the Material fields in earlier releases.)

You can download the source here: http://files.minecraftforge.net/maven/net/minecraftforge/forge/1.7.2-10.12.0.1024/forge-1.7.2-10.12.0.1024-src.zip

You will need to unzip it and run the two gradlew commands – see Post 2.

Thanks to Eli and Ailish who between them were the first to get this working.

Files Needed

Very similarly to creating an Item mod (see Post 8) you need at least 4 things to create a new Block mod:

1. A new block class that extends the standard Block class
2. A mod class where you add it to the game registry (you can just add some lines to one you have already)
3. A language file where you specify its name
4. A texture file to control its appearance

I am keeping this code in the same package I already used for our item mod, modderdojo.firstitem.

The Block Class

Create a Java file in this package called MyFirstBlock with this code:

// Michael Madden March 2014.
// Ref: http://www.minecraftforge.net/wiki/Basic_Items
// Thanks to Ailish and Eli in CoderDojo Athenry who figured this out originally. 

package modderdojo.firstitem;

import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraft.creativetab.CreativeTabs;

public class MyFirstBlock extends Block
{
 public MyFirstBlock()
 {
 // This is the constructor for our new item. Set basic properties in it.
 super(Material.iron); // Copy the properties of iron

 setCreativeTab(CreativeTabs.tabBlock);
 setBlockName("MichaelFirstBlock"); // This is the internal name, not display name
 }
}

Adding It to the Registry

Add this code to the preInit method in your main mod class (in my case called MyFirstMod):

 // Register my block and set its texture
 MyFirstBlock b = new MyFirstBlock();
 b.setBlockTextureName("modderdojo:mmblock"); // requires .png file with this name
 GameRegistry.registerBlock(b, "MichaelFirstBlock");

Appearance

For this step, you need to create a texture that will be used on all sides of the block.

Using a graphics package such as Paint.NET, create an image of size 32 x 32 (other sizes that are powers of 2 are also OK). Save it in PNG format.

In the src/main/resources folder, create a new package called assets.modderdojo.textures.blocks (just like the one you did for your first item, but with blocks instead of items in its name). Put the PNG file in it. In my case, the file is called mmblock.png.

In your main mod class preInit method, add/update this line:

b.setBlockTextureName("modderdojo:mmblock");

The name you set is based on where you put it “assets.modderdojo.textures.blocks” followed by a colon “:” followed by the name of the PNG file put without “.png”: mmblock.png.

Name

If you run your code now (and it’s a good idea to keep running after every step, to test what you have done), you will see that your block has the name tile.MichaelFirstBlock.name. To give it a better name, add a line to the language file, en_US.lang:

tile.MichaelFirstBlock.name=Michael's First Block Display Name