containers

Author: viktorvoltz

Containers/Trial.java

@@ -0,0 +1,38 @@
+import java.util.*;
+
+interface Generator<T> {
+    T next();
+}
+
+class CollectionData<T> extends ArrayList<T> {
+    public CollectionData(Generator<T> gen, int quantity) {
+        for (int i = 0; i < quantity; i++)
+            add(gen.next());
+    }
+
+    // A generic convenience method:
+    public static <T> CollectionData<T> list(Generator<T> gen, int quantity) {
+        return new CollectionData<T>(gen, quantity);
+    }
+}
+
+class Government implements Generator<String> {
+    String[] foundation = ("strange women lying in ponds " +
+            "distributing swords is no basis for a system of " +
+            "government").split(" ");
+    private int index;
+
+    public String next() {
+        return foundation[index++];
+    }
+}
+
+class CollectionDataTest {
+    public static void main(String[] args) {
+        Set<String> set = new LinkedHashSet<String>(
+                new CollectionData<String>(new Government(), 15));
+        // Using the convenience method:
+        set.addAll(CollectionData.list(new Government(), 15));
+        System.out.println(set);
+    }
+}