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

/**
 * Bad exception handling
 * 
 * Problem is that rather than handling the issue, the main method
 * simply throws it on, for someone else to handle.  Doing this allows
 * the program to compile.  BUT, there is no one to catch something
 * thrown by main (more or less by definition). Hence, the program
 * dies in an uncontrolled manner.   Unacceptable.
 * 
 * Created: Jan 2022
 * @author gtowell
 */
public class ExBad2 {
    /**
     * 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 {
        ExBad2 ex = new ExBad2();
        ex.doo("20");
    }
}