迭代器遍历

src/chapter6/Example3.java

@@ -1,4 +1,22 @@
 package chapter6;
 
+import java.util.ArrayList;
+import java.util.Iterator;
+
 public class Example3 {
+    public static void main(String[] args) {
+        ArrayList<String> list = new ArrayList();
+        list.add("A");
+        list.add("B");
+        list.add("C");
+        list.add("D");
+
+        Iterator<String> iterator = list.iterator();
+        // Iterator> iterator = list.iterator();
+        while (iterator.hasNext()) {
+            String item =  iterator.next();
+            // String item =  (String) iterator.next();
+            System.out.println(item);
+        }
+    }
 }