void main() {
    IO.println("Hello, World!");
}

import java.nio.file.*;

void main(String[] args) throws Exception {
    Path file = Path.of(args[0]);
    IO.println(Files.readString(file));
}

java Prog.java arg1 arg2

# [JEP 512](https://openjdk.org/jeps/512) examples

Source: https://openjdk.org/jeps/512

Compact source file with instance `main`:

```java
void main() {
    IO.println("Hello, World!");
}
```

Small script with imports and helpers:

```java
import java.nio.file.*;

void main(String[] args) throws Exception {
    Path file = Path.of(args[0]);
    IO.println(Files.readString(file));
}
```

[JEP 458](https://openjdk.org/jeps/458) still applies to multi-file source programs: invoke the entry file only.

```bash
java Prog.java arg1 arg2
```