I got error from ArrayList

I used it before on JDK 1.7. It was OK. After move it to new laptop with JDK 1.8. I got Syntax error from "ArrayList array = new ArrayList()" line. Someone know what happen it in here.

Syntax error, annotations are only available if source level is 1.5 or greater FileWriter.java

    public static String[] fileToArray(String filename) throws IOException
        {
            FileReader file = new FileReader();
  error >>  ArrayList<String> array = new ArrayList<String>();
            String line;

            file.open(filename);

            while((line = file.readLine()) != null)
            {
                if (line.length() > 0)
                    array.add(line);
            }

            return (String[])array.toArray(new String[array.size()]);
        }
    }