Java support for Roblox [JBlox]

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#1

Hi, so im working on JBlox which is just an interpreter for java in roblox.
Yeah so you can code in Java basically.

heres an example code:

local JBlox = require(script.Parent.JBlox)

JBlox.JRun([[
import roblox.*;

public class SpawnPart {
    public static void main(String[] args) {
        String myString = new String("Hello");
        int myInt = new int(42);
        char myChar = new char("A");
        double myDouble = new double(3.14);
        Color3 myColor = new Color3("Bright blue");
        BrickColor myBrickColor = new BrickColor("Bright red");
        Vector3 myVector = new Vector3(10, 10, 5);
        
        Instance myPart = new Instance("Part");
        myPart.Anchored = true;
        myPart.Size = myVector;
        myPart.BrickColor = myBrickColor;
        myPart.Parent = workspace;
    }
}
]])

heres the early version module with lots of errors:

JBlox.lua (3.3 KB)

18 Likes
#2

Curious, is this for like a project ? IF you want access to types and such, why not use use typed Luau?

I am not saying what you have done is not cool, just curious as to what is gained by doing it this way?

2 Likes
#3

i thought it may be easier for java/C# devs to maybe transfer to roblox by using the java syntax

2 Likes
#4

Check out MiddleClass on github. I came from C# and it made working won’t lua like 1000x easier to me. I rave that its the perfect OOP language, and it even comes with self checking like an instance to registered classes in the core module.

It has just the right sugar, and robust implementation to not be too much overhead for class definition but enough to be readable and informative.

But again, I applaud the practice its always cool to see things like that. =-)

2 Likes
#5

Awesome! Get this on Github. I’ll contribute something to it.

2 Likes
#6

OMG I LIKE PROGRAMMING IN JAVA AND SUFFER BY 192891919 EXCEPTIONS
IMA USE THIS VERY 10/10 THING

complete sentence

2 Likes
#7

I recommend using Lux for the grammar

3 Likes
#8

seriously java in roblox?, reply “…” if you are kidnaped

10 Likes
#9

creating a massive compatibility layer for a language everyone hates is wild

4 Likes
#10

you should make a transpiler to convert java to lua code, instead of interpreting the java code during runtime, here’s why:

  • performance is going to be a lot better since the interpreting is already done beforehand
  • there will be no need for loadstring to be enabled (security risk & performance is going to further suffer)
  • type annotations & plugins can be used because the java code can be written in an actual IDE instead of a string

you should take a look at roblox-ts because it’s a similar project to yours

2 Likes
#11

especially for minecraft mod makers who are using roblox (random situation)

1 Like
#12

but then it’s not gonna be like actual java!

Question, why do you use a .LUA file if you can only import RBXL and RBXM

2 Likes
#13

I appreciate how you’re encouraging more developers to join the Roblox platform by allowing them to continue coding in their preferred languages. Hopefully, many developers from other platforms will see this and be inspired to join.

1 Like
#14

but then it’s not gonna be like actual java!

i am not sure what you mean by this, please regard my last point

  • type annotations & plugins can be used because the java code can be written in an actual IDE instead of a string

by using a transpiler, you will be able to write actual java code with a java ide, instead of blindly writing it in a string

additionally, there will be no performance losses because the transpiler should output luau code

1 Like
#15

They were referring to poor performance

2 Likes
#16

Then make a C++ compiler :upside_down_face:

1 Like
#17

I was making a joke.

why thirty lol

1 Like
#18

thats not how it works sir, i think you forgor about the translation part

1 Like
#19

i wasn’t wrong about anything, please look at roblox-ts because it’s exactly i’ve just described

2 Likes
#20

??? roblox-ts does not do real time compilation