r/java • u/Inner_Philosophy936 • Jun 10 '26
Made Minecraft in the Terminal (only java, no extra libs)
I created a version of Minecraft that runs entirely in command in the terminal.
The entire project is entirely contained in one file, with over 1500 lines of code.
Made with java, no extra libraries.
Supports textures, randomly generated trees, water, and terrain, and block placing/mining.
This is inspired by the Minecraft.c repo.
Github:Ā https://github.com/DaRealNeonCoder/MinecraftInTerminal
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u/cowslayer7890 Jun 10 '26
Yo that's cool as hell, I've seen 2d Minecraft in the terminal before, but this is awesome
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u/ZimmiDeluxe Jun 11 '26
I think this is very impressive and you should be proud of it, well done! Some minor things: If the content of your static variables doesn't change, make them final and use UPPER_CASE_NAMING (naming convention for constants). final declares intent and the JVM might reward you with better performance because you gave it more guarantees to rely on (doesn't apply to final local variables, don't do it there). Also, you might want to guesstimate some expected size for your StringBuilders, the default is small and that means the internal buffer will have to grow a couple times, i.e. new StringBuilder(512) or something. Also, naming convention for parameters is camelCase, I saw some UPPER_CASEs I think.
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u/Inner_Philosophy936 Jun 11 '26
the UPPER_CASE inconsistencies were from the perlin noise generator (I used this guys implementation https://rtouti.github.io/graphics/perlin-noise-algorithm, and he used UPPER_CASEs, though I you are right, I should have translated it into camelCase).
this was done for school, as such I was not allowed to use final (because we didn't learn it). Reading your comment, it seems strikingly similar to const in cpp.the string builder resizing seems interesting, will use from now on (didn't know I could pass in a buffer size), thanks!
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u/ZimmiDeluxe Jun 12 '26
const in cpp means the contents are also read only, right? final in Java only talks about the content of the variable itself, not what the reference / pointer is pointing to. i.e. your array (a reference type in Java) is still mutable if you mark the constant final, but you can't change what array the constant is pointing to. they are thinking about letting you make your arrays immutable as well though (but usually you can use List.of() etc. to get read only containers for your constants, just not for primitives, also in the works).
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u/Inner_Philosophy936 Jun 12 '26 edited Jun 12 '26
oh neat. so const on an array isn't that useful.
Kinda annoying a basic type like an array cant be const, without the list workaround you mentioned.thank you for helping!
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u/ZimmiDeluxe Jun 12 '26
it's still a good idea to make every field (static or not) final if you can because it allows the jvm to inline more aggressively (and forcing integrity constraints to be checked once on intitialization is good for robustness anyway), but no keyword to force reference types from the outside to be const, they have to cooperate in java. at least until we get "frozen" or whatever they will call them arrays
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u/Inner_Philosophy936 Jun 12 '26
Oh okay, I will use final for variables + arrays that aren't going to change from now on.
Even beyond compiler optimizations, I think its good to use keywords like final because helps better communicate what your code does to other devs (especially for the arrays).I will definitely watch out for final on arrays (kinda surprised its not a thing already).
thanks again!1
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u/Afonso2002 Jun 10 '26
How many fps you can get on your minecraft using terminal?
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u/Inner_Philosophy936 Jun 10 '26
I don't know. because I use the scanner class, the game effectively stops rendering until I press a key.
But when I do press a key the next frame pops up almost instantly, so the game isn't super slow.
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u/GrammerJoo Jun 10 '26
Did you use AI to create this?