ExceptionTraining.java

/**
 * @author Lukasz Piliszczuk <lukasz.pili AT gmail.com>
 */
public class ExceptionTraining {

    public static void main(String[] args) {

        int choice = 10;
        try {
            choice = Integer.valueOf("sdf");
            System.out.println("Foo");
        } catch (NumberFormatException e) {
            System.out.println(choice);
        } 
        
        // AFFICHE 10

        
        choice = 10;
        try {
            System.out.println("Foo");
            choice = Integer.valueOf("sdf");
            System.out.println("Bar");
        } catch (NumberFormatException e) {
            System.out.println(choice);
        }
        
        // AFFICHE Foo 10

        
        try {
            Integer.valueOf("sdf");
        } catch (NumberFormatException e) {
            System.out.println("Foo");
        } catch (Exception e) {
            System.out.println("Bar");
        }
        
        // AFFICHE Foo

        
        try {
            Integer.valueOf("sdf");
        } catch (Exception e) {
            System.out.println("Bar");
        } catch (NumberFormatException e) {
            System.out.println("Foo");
        }

        // Ne compile pas car Exception englobe NumberFormatException

        
        try {
            Integer.valueOf(null);
        } catch (NumberFormatException e) {
            System.out.println("Foo");
        } catch (NullPointerException e) {
            System.out.println("Bar");
        }
        
        // Affiche Foo

        
        try {
            Integer.valueOf("sdf");
        } catch (NullPointerException e) {
            System.out.println("Bar");
        }
        
        // Crash car l'exception NumberFormatException n'est pas catchée

        
        try {
            Integer.valueOf("sdf");
        } catch (Exception e) {
            System.out.println("Bar");
        }
        
        // Affiche Bar

        
        try {
            Integer.valueOf("sdf");
        } catch (Exception e) {
            System.out.println("Foo");
        } finally {
            System.out.println("Bar");
        }
        
        // Affiche Foo Bar

        
        try {
            Integer.valueOf("10");
        } catch (Exception e) {
            System.out.println("Foo");
        } finally {
            System.out.println("Bar");
        }
        
        // Affiche Bar

        
        try {
            return Integer.valueOf("10");
        } catch (Exception e) {
            return 0;
        } finally {
            System.out.println("Bar");
        }
        
        // Affiche Bar puis retourne 10

        
        try {
            return Integer.valueOf("10");
        } finally {
            System.out.println("Bar");
        }
        
        // Affiche Bar puis retourne 10

        
        try {
            return Integer.valueOf("sdf");
        } finally {
            System.out.println("Bar");
        }

        // Affiche Bar puis crash

        
        try {
            return Integer.valueOf("10");
        } catch (Exception e) {
            return 0;
        } finally {
            return 99;
        }

        // Retourne 99

        
        try {
            return Integer.valueOf("asd");
        } catch (Exception e) {
            return 0;
        } finally {
            return 99;
        }

        // Retourne 99
    }
}