angabe ue09

uebung09/src/collection/SetFactory.java

@@ -0,0 +1,41 @@
+package collection;
+
+public class SetFactory {
+
+    private SetFactory() { /* don't instantiate */ }
+
+    /**
+     * Returns the empty set.
+     *
+     * @param <T> the element type of the returned set.
+     * @return the empty set.
+     */
+    static <T> Set<T> create() {
+        // TODO implement
+        return null;
+    }
+
+    /**
+     * Returns the singleton set containing the specified element.
+     *
+     * @param element an element (must not be null)
+     * @param <T>     the element type of the returned set.
+     * @return the singleton set containing the specified element.
+     */
+    static <T> Set<T> create(T element) {
+        // TODO implement
+        return null;
+    }
+
+    /**
+     * Returns a set containing the specified elements. The specified elements may contain equal elements.
+     *
+     * @param elems elements of the returned set (may contain equal elements)
+     * @param <T>   the element type of the returned set.
+     * @return a set containing the specified elements.
+     */
+    static <T> Set<T> create(T... elems) {
+        // TODO implement
+        return null;
+    }
+}