Java Main Method and System.out.println

It's saying that the `System.out.println` statement is not allowed in the `main` method of a Java program. The `System.out.println` statement is only allowed in the `main` method of a Java program if it is the last statement in the method.

You can't use `System.out.println` in the `main` method of a Java program. It is not allowed to print statements in the `main` method.

Instead, you can use a `PrintStream` object to print statements to the console. Here's an example:
```
import java.io.*;

public class HelloWorld {
public static void main(String[] args) {
PrintStream out = System.out;
out.println("Hello, World!");
}
}
```
This will print "Hello, World!" to the console.

Alternatively, you can use the `System.err` stream to print error messages or other information that should be displayed on the console. Here's an example:
```
import java.io.*;

public class HelloWorld {
public static void main(String[] args) {
System.err.println("Error: This is an error message.");
}
}
```
This will print "Error: This is an error message." to the console.