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Here's how I suggest going about it. This is how I figure things out. So your original question was how to "scan" the entities in the world. So I would go to the World class and look at what fields and methods are available, literally scroll through them to see if anything looks interesting. In Eclipse you can use the Type Hierarchy for the World class (and generally a good idea to enable all inherited stuff with little button at top of the list of methods). If you scroll through that you will see there is a field called loadedEntityList. If you right click and pick "Declaration" you can go to where it is declared in the code. There you will see that it is public scope meaning that it is available for you to use in your classes -- cool. Sometimes in modding the names of the fields and methods don't match what you expect, so it is a good idea to confirm this is what you want by looking at the Call Hierarchy for that field. If you do you'll see how it is used by Minecraft and in this case it looks like a useful thing. Now the type of field is a simple Java List<Entity>. So basically you can do everything you would want to do with a List. If you don't know Java well you should look it up, but Lists can be iterated in a loop so you can just loop through and find all the entries that are instanceof EntityDog (or whatever you're looking for) and so on. That is how you "scan the entire world for a specific entity"...

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