Prac4_Wk4_Fri8

PracticalFour.java

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Random;
public class PracticalFour {

    /**
     * Throw an exception of the given 'type' in the arguments list,
     * or print "No problems" if 'NONE'
     *
     * Work on this until: 8:21
     *
     * @param type The type of error to throw (or NONE)
     */
    private static void makeException(ExceptionEnum type)
            throws FileNotFoundException, UnknownException {

        switch (type) {
            case NONE:
                System.out.println("No problems");
                break;
            case NULL:
                throw new NullPointerException();
            case BOUNDS:
                throw new ArrayIndexOutOfBoundsException();
            case MISSING:
                throw new FileNotFoundException();
            case UNKNOWN:
                throw (new UnknownException());
                /* throw <object> */
        }
    }

    private static void f() {

        try {
            try {
                makeException(ExceptionEnum.NULL);
            } catch (NullPointerException e) {
                System.out.println("Null was squashed");
                // Squash
            }

            makeException(ExceptionEnum.NONE);
            makeException(ExceptionEnum.MISSING);
            makeException(ExceptionEnum.NONE);
        } catch (Exception e) { // BAD!
            System.out.println(e.toString());
        }
    }

    // Work on h() until 9:02
    private static void h(Random random) throws UnknownException {
        try {
            g(random);
        } catch (FileNotFoundException e) {
            System.out.println(e);
        } finally {
            System.out.println("Reached here!");
        }
    }

    private static void g(Random random) throws FileNotFoundException, UnknownException {

        int x = random.nextInt(ExceptionEnum.values().length);
        int y = random.nextInt(ExceptionEnum.values().length);

        try {
            makeException(ExceptionEnum.values()[x]);
            System.out.println("x = " + x);
            makeException(ExceptionEnum.values()[y]);
            System.out.println("y = " + y);
        } catch (NullPointerException | ArrayIndexOutOfBoundsException e) {
            System.out.println(e);
        }
    }

    public static void main(String[] args) {
        f();

        Random random = new Random();
        for (int i = 0; i < 5; i++) {
            try {
                h(random);
            } catch (UnknownException e) {
                System.out.println(e);
            }
        }
    }
}