package helloworld;
import java.*;
public class helloworld()
{
    public static void main(String[] args)
    {
        System.out.print("Hello World!");
    }
}

Exception in thread "main" java.lang.Error: Unresolved compilation problems:
Syntax error on token "void", @ expected
Syntax error on token "]", invalid (
Syntax error, insert "]" to complete ArrayAccess
Syntax error, insert ")" to complete SingleMemberAnnotation
Syntax error, insert "enum Identifier" to complete EnumHeader

at helloworld.main(helloworld.java:5)