import java.text.SimpleDateFormat;
import java.util.Date;

public class SimpleLogger {
    private final String program_name;
    private final SimpleDateFormat date_format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS Z");

    public SimpleLogger(String program_name) {
        this.program_name = program_name;
    }

    public void log(String message) {
        Date now = new Date();
        String formatted_date = date_format.format(now);
        String line = program_name + " " + formatted_date + ": " + message;
        System.out.println(line);
    }
} // class SimpleLogger