import java.io.FileReader;
import java.io.IOException;

/**
 * Reasonable exception handling, which is about all you can do in 
 * this short a program. Again, doo can throw an IOException
 * Main uses a try-catch to handle the exception possibility. 
 * If an exception occurs, print an error message and exit.
 * 
 * Created: Jan 2022
 * @author gtowell
 */
public class ExGood {
    /**
     * A function that opens a FileReader -- for no real reason
     * @param filename the name of the file to try to open
     * @throws IOException
     */
    public void doo(String filename) throws IOException {
        FileReader bb = new FileReader(filename);
    }
    public static void main(String[] args) throws IOException {
        ExGood ex = new ExGood();
        try {
            ex.doo("20");
        } catch (IOException ioe) {
            System.err.println("Problem calling doo with arg 20" + ioe);
            return;
        }
    }
}