this post was submitted on 13 Nov 2024
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Anon tries programming in Java (lemmy.world)
submitted 1 day ago by LiamTheBox@lemmy.world to c/greentext@sh.itjust.works
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[–] JackbyDev@programming.dev 5 points 9 hours ago (2 children)

This is getting a little better nowadays.

> cat Hello.java
void main() {
    System.out.println("Hello, World!");
}
> java --enable-preview Hello.java
Hello, World!

Things to notice:

  1. No compilation step.
  2. No class declaration.
  3. Main method is not public static
  4. No String[] args.

This still uses preview features though. However, like you demonstrated already, compilation is no longer a required step for simplistic programs like this.

[–] PanArab@lemm.ee 1 points 1 hour ago* (last edited 1 hour ago) (1 children)

Main method is not public static

It must be somewhere under the hood. Otherwise, it wont be callable and it would require an instance of an object to call. Unless the object here is the Java environment?

No String[] args

They are just optional I'm sure, like C and C++. You still need them to read command line arguments.

All in all, these syntax improvements are welcome. I already moved on to Kotlin for Android development though.

[–] JackbyDev@programming.dev 1 points 31 minutes ago* (last edited 31 minutes ago)

Main method is not public static

It must be somewhere under the hood. Otherwise, it wont be callable and it would require an instance of an object to call. Unless the object here is the Java environment?

No. From JEP-445:

If an unnamed class has an instance main method rather than a static main method then launching it is equivalent to the following, which employs the existing anonymous class declaration construct:

new Object() {
    // the unnamed class's body
}.main();

No String[] args

They are just optional I'm sure, like C and C++. You still need them to read command line arguments.

Without the preview feature enabled, it is not an optional part of the method signature. It specifically looks for a main(String[]) signature.

[–] cashew@lemmy.world 4 points 6 hours ago* (last edited 6 hours ago) (1 children)

Microsoft Java is a one-liner these days.

> cat program.cs
Console.WriteLine("Hello, World!");
> dotnet run
Hello, World!