An ArrayList that reuses a single iterator

core/java/test/junit/net/i2p/util/CachedIteratorArrayListTest.java

@@ -0,0 +1,43 @@
+package net.i2p.util;
+
+import static org.junit.Assert.*;
+
+import java.util.Iterator;
+import java.util.List;
+
+import org.junit.Before;
+import org.junit.Test;
+
+public class CachedIteratorArrayListTest {
+
+    private List<Integer> l;
+    
+    @Before
+    public void setUp() {
+        l = new CachedIteratorArrayList<Integer>();
+        l.add(1);
+        l.add(2);
+        l.add(3);
+    }
+    
+    @Test
+    public void test() {
+        // test for-each worx
+        int total = 0;
+        for (int i : l)
+            total += i;
+        assertEquals(6, total);
+        for (int i : l)
+            total += i;
+        assertEquals(12, total);
+        
+    }
+    
+    @Test
+    public void testSameness() {
+        Iterator<Integer> two = l.iterator();
+        Iterator<Integer> one = l.iterator();
+        assertSame(one, two);
+    }
+
+}