public class SetTestSelf {

    public static void main(String[] args) {
        java.util.Random gen = new java.util.Random();
//        java.util.LinkedList<String> fehler = new java.util.LinkedList<>();
        System.out.println("Vergleiche ob die Äquivalenz immer gilt");
        System.out.println("Block " + 0);
        Set<Integer> a = new Set();
        Set<Integer> b = new Set();
        Set<String> c = new Set();
        for (int i = 0; i < 20; i++) {
            Integer add = gen.nextInt(20);
            System.out.println("Add " + add);
            a = a.add(add);
//            if (!a.contains(add))
//                fehler.add("Nach dem Hinzufügen des Elements " + add + " sieht "
//                        + "das Set so aus a=" + a.toString() 
//                        + " und contains(" + add + ") liefert false.");
            System.out.println("a = " + a);
            b = b.add(add);
//            if (!b.equals(a) || !a.equals(b))
//                fehler.add("Nach dem Hinzufügen des Elements " + add + " in die "
//                        + "beiden äquivalenten Sets a="
//                    + a.toString() + " liefert contains(" + add + ") false.");
            c = c.add(add.toString());
        }
        System.out.println();
        
        System.out.println("a = " + a);
        System.out.println("b = " + b);
        System.out.println("c = " + c);
        System.out.println();
        
        System.out.println("Block " + 1);
        System.out.println("true == " + a.equals(a));
        System.out.println("false == " + a.equals(null) + " == " 
                        + a.equals(true) + " == " + c.equals("noway"));
        System.out.println();
        
        System.out.println("Block " + 2);
        System.out.println(a.size() + " == " + b.size());
        System.out.println("true == " + a.equals(b) + " == " + b.equals(a));
        System.out.println("false == " + a.equals(c) + " == " + c.equals(a)
                              + " == " + b.equals(c) + " == " + c.equals(b));
        System.out.println();
        
        Set<Integer> d = a;
        
        System.out.println("Block " + 3);
        System.out.println("true == " + a.equals(d) + " == " + d.equals(a));
        d.add(101);
        System.out.println("true == " + a.equals(d) + " == " + d.equals(a));
        d = d.add(101);
        System.out.println("false == " + (a == d) + " == " 
                                + a.equals(d) + " == " + d.equals(a));
        a = a.add(101);
        System.out.println("true == " + a.equals(d) + " == " + d.equals(a));
        System.out.println("false == " + (a == d));
        System.out.println();
        
        System.out.println("Block " + 4);
        d = d.remove(101);
        a.remove(101);
        System.out.println("false == " + a.equals(d) + " == " + d.equals(a));
        a = a.remove(101);
        System.out.println("true == " + a.equals(d) + " == " + d.equals(a));
        System.out.println();
        
        System.out.println("Block " + 5);
        a.add(99);
        System.out.println("true == " + a.equals(b) + " == " + b.equals(a));
        System.out.println(a.size() + " == " + b.size());
        System.out.println();
        
        System.out.println("Block " + 6);
        a = a.add(99);
        System.out.println("false == " + a.equals(b) + " == " + b.equals(a));
        System.out.println(a.size() + " == " + (b.size()+1));
        System.out.println();
        
        System.out.println("Block " + 7);
        a = a.remove(99);
        System.out.println("true == " + a.equals(b) + " == " + b.equals(a));
        System.out.println(a.size() + " == " + b.size());
        System.out.println();
        
        System.out.println("Block " + 8);
        a = a.remove(18293729);
        System.out.println("true == " + a.equals(b) + " == " + b.equals(a));
        System.out.println(a.size() + " == " + b.size());
        System.out.println();
        
        System.out.println("Block " + 9);
        try {
            a = a.remove(null);
        } catch (NullPointerException e) {
            System.out.println("Korrekte NullPointerException");
        } finally {
            System.out.println("Exception geworfen?");
        }
        System.out.println();
        
        System.out.println("Block " + 10);
        int size = a.size();
        for (int i = 0; i < 20; i++) {
            Integer rem = gen.nextInt(20);
            System.out.println("Remove " + rem);
            if (a.contains(rem))
                size --;
            a = a.remove(rem);
            System.out.println("Set = " + a);
            if (!(size == a.size()))
                System.out.println("FEHLER!");
            b = b.remove(rem);
        }
        System.out.println("true == " + a.equals(b));
        
        // Iterator-Test:
        if (a instanceof Iterable) {
            System.out.println("\nIterator-Test:");
            Iterable<Integer> aClone = (Iterable<Integer>) a;  // falls implementiert, dann unnötig, nur zur Sicherheit
            java.util.Iterator<Integer> it = aClone.iterator();
            while (it.hasNext()) {
                System.out.println("next(): " + it.next());
            }
        } else {
            System.out.println("\nIterator nicht implementiert.");
        }
    }
}