Quiz Archive

Archie.java

public class Archie {
 
        public static void main(String[] args) {
                Pattern p = Pattern.compile(args[0]);
                Matcher m = p.matcher(args[1]);
                int count = 0;
                while (m.find()) count++;
                System.out.println(count);
        }
}

Bottom.java

class Top {
        public Top(String s) {
                System.out.println("B");
        }
}
class Bottom extends Top {
        public Bottom(String s) {
                System.out.println("D");
        }
        public static void main(String[] args) {
                new Bottom("C");
                System.out.println(" ");
        }
}

ComparaisonNumerique.java

public class ComparaisonNumerique {
    public static void main(String[] args) {
        int i = 4;
        float f = 4.3;
        double d = 1.8;
        int c = 0;
        if (i == f)
            c++;
        if (((int) (f + d)) == ((int) f + (int) d))
            c += 2;
        System.out.println(c);
    }
}

EtBenOui.java

public class EtBenOui {
    static int value;

    static boolean a() {
    return value++ > 1;
    }

    static boolean b() {
    return value++ > 1;
    }

    static boolean c() {
    return value++ > 1;
    }

    public static void main(String[] args) {
    if (a() & b()) {
        c();
    }
    else{
        System.out.println("Bim");
    }
    System.out.println(value);
    }
}

Exception.java

public class Foo 
{  
    public static void main(String[] args) 
    {
        try 
        { 
            System.exit(-1); 
        } 
        finally 
        {
            System.out.println( "Finally" ); 
        } 
    } 
}

Finally.java

public static void main (String[] args)
{
    try
    {
        System.out.print ("A");
        int value = Integer.parseInt ("8A");
        System.out.print ("B");
    }
    catch (NumberFormatException exception)
    {
        System.out.print ("C");
        return;
    }
    finally
    {
        System.out.print ("D");
    }
    System.out.print ("E");
}

GC.java

class Bar { } 
class Test 
{  
    Bar doBar() 
    {
        Bar b = new Bar(); /* Line 6 */
        return b; /* Line 7 */
    } 
    public static void main (String args[]) 
    { 
        Test t = new Test();  /* Line 11 */
        Bar newBar = t.doBar();  /* Line 12 */
        System.out.println("newBar"); 
        newBar = new Bar(); /* Line 14 */
        System.out.println("finishing"); /* Line 15 */
    } 
}

IfElse.java

int x = 5; 
double y = 3.5; 
if (x > 5 && y > x || x + 3 < y + 1) 
   System.out.println ("A"); 
else if (x < y + 1 && x + y <= 12) 
   System.out.println ("B"); 
else System.out.println ("C");

Leader.java

public class Leader implements Runnable {
        public static void main(String[] args) throws InterruptedException {
                Thread t = new Thread(new Leader());
                t.start();
                System.out.print(" m1");
                t.join();
                System.out.print(" m2");
        }
        public void run() {
                System.out.print(" r1");
                System.out.print(" r2");
        }
}

Mixer.java

class Mixer {
        Mixer m1;
        Mixer() {}
        Mixer(Mixer m) {m1 = m;}
        public static void main(String[] args) {
                Mixer m2 = new Mixer();
                Mixer m3 = new Mixer(m2);       m3.go();
                Mixer m4 = m3.m1;               m4.go();
                Mixer m5 = m2.m1;               m5.go();
 
        }
        private void go() { System.out.println("hi "); }
}

Operator.java

public static void main(String[] args) {
    for (int i = 0; i < 10; i++) {
        i -= i++ - --i;
        System.out.println("Hello world!") ;
    }
}

Pattern1.java

public abstract class AbstractRegister {

    private Connection getDatabase(){
        // return Connection
    }

    //Different for User, Admin, SuperBoss
    public abstract String getTable();

    private String writeQuery(){
        return "INSERT INTO "+getTable()+ " BLABLABLA;";
    }

    private void tweetThatStuff(){/* tweet stuff*/}

    public void execute(){
        getDatabase().write(writeQuery());
        tweetThatStuff();
    }
}

Pattern2.java

public class TopicPattern {
    Topic s;

    public TopicPattern addComment(Comment comment){
        // add a comment to the topic
        return this;
    }
    public TopicPattern addFlag(Comment c, User u, String reason){
        //flag the topic with bad comment
        return this;
    }
}

class StarrableSubjectPattern extends  TopicPattern{

    public TopicPattern addStar(Star star){
        // user says this comment rocks
        return this;
    }
}

Priority.java

PriorityQueue<String> pq = new PriorityQueue<>();
pq.add("2");
pq.add("4");
System.out.print(pq.peek() + " ");
pq.add("3");
pq.remove("1");
System.out.print(pq.poll() + " ");
if (pq.remove("2")) System.out.println(pq.poll() + " ");
System.out.println(pq.poll() + " " + pq.peek());

Quiz2.java

public class Quiz2 {
    private static class MonRunnable implements Runnable {
        public void run() {
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // Pas bien !
            }
            System.out.println("Bonjour");
        }
    }
    
    public static void main(String[] args) {
        Thread t = new Thread(new MonRunnable());
        t.run();
        System.out.println("Au revoir");
    }
}

Scanner.java

String input = "1 2 a 3 45 6";
try (Scanner sc = new Scanner(input)) {
        int x = 0;
        do {
                x = sc.nextInt();
                System.out.print(x + " ");
        } while (sc.hasNextInt());
}

SustainableDev.java

public class SustainableDev {
        public static void main(String[] args) {
              int a = 8; int b = 2;
               
              a = a ^ b;
              b = a ^ b;
              a = a ^ b;
               
              System.out.println("a = " + a + "; b = " + b);
        }
}

TestInners.java

class A { void m() { System.out.println("outer"); } }
public class TestInners {
        public static void main(String[] args) {
                new TestInners().go();
        }
        void go() {
                new A().m();
                class A { void m() { System.out.println("inner"); } }
        }
        class A { void m() { System.out.println("middle"); } }
}

Travel.java

class Business{}
class Hotel extends Business {}
class Inn extends Hotel {}
class Travel {
        List<Hotel> go(){
                //insert code here
        }
}