testing

src/uebung09/collection/SingeltonSet.java

@@ -0,0 +1,77 @@
+package uebung09.collection;
+
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+
+class SingeltonSet<T> implements Set<T> {
+
+    private T item;
+
+    public SingeltonSet(T item) {
+        this.item = item;
+    }
+
+    @Override
+    public Iterator<T> iterator() {
+        return new Iterator<T>() {
+
+            boolean returned = false;
+
+            @Override
+            public boolean hasNext() {
+                return !returned;
+            }
+
+            @Override
+            public T next() {
+                if (!returned) {
+                    returned = true;
+                    return item;
+                } else {
+                    throw new NoSuchElementException();
+                }
+            }
+        };
+    }
+
+    @Override
+    public int size() {
+        return 1;
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return false;
+    }
+
+    @Override
+    public boolean contains(Object el) {
+        return el == item;
+    }
+
+    @Override
+    public Set<T> union(Set<T> other) {
+        //TODO
+        return null;
+    }
+
+    @Override
+    public Set<T> add(T element) {
+        if (element == item) {
+            return this;
+        } else {
+            return new BigSet<T>(item, new SingeltonSet<T>(element));
+        }
+    }
+
+    @Override
+    public Set<T> intersection(Set<T> other) {
+        // TODO Auto-generated method stub
+        throw new UnsupportedOperationException("Unimplemented method 'intersection'");
+    }
+
+    @Override
+    public boolean subsetOf(Set<?> other) {
+        throw new UnsupportedOperationException();
+    }
+}