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Java Hello World, LLVM Edition

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200 points ingve | 3 comments | 07 Dec 25 11:51 UTC | HN request time: 0s | source
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troymc ◴[07 Dec 25 14:01 UTC] No.46181738[source]▶
I made a poster showing how one might write a Hello World program in 39 different programming languages, and even different versions of some common languages like Java:

https://troymcconaghy.blog/2025/01/13/39-hello-world-program...

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pron ◴[07 Dec 25 14:34 UTC] No.46181936[source]▶
Nice, but as of JDK 25 (the preview JEP 445 has become the permanent JEP 512), the canonical Hello World in Java is:

    void main() {
        IO.println("Hello World");
    }
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1. prmoustache ◴[07 Dec 25 19:02 UTC] No.46184122[source]▶
Not a java developer but why the void? Shouldn't your main function and program return an integer?
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2. tadfisher ◴[07 Dec 25 19:34 UTC] No.46184384[source]▶
I believe that is a C-ism, where the C runtime calls your main() and exits the process with the return value. The Java equivalent is System.exit(int status).
3. gavinray ◴[07 Dec 25 20:09 UTC] No.46184677[source]▶
The return type of a Java main is the JVM platform return type

Sending system signals is external to the JVM platform