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docs: update iterator
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Ilkka Seppälä
+88
-8
@@ -111,20 +111,100 @@ public interface Iterator<T> {
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}
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```
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In the following example, we iterate through the ring-type items found in the chest.
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In the following example, we demonstrate different kinds of iterators.
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```java
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var itemIterator = TREASURE_CHEST.iterator(ItemType.RING);
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while (itemIterator.hasNext()) {
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LOGGER.info(itemIterator.next().toString());
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@Slf4j
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public class App {
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private static final TreasureChest TREASURE_CHEST = new TreasureChest();
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private static void demonstrateTreasureChestIteratorForType(ItemType itemType) {
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LOGGER.info("------------------------");
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LOGGER.info("Item Iterator for ItemType " + itemType + ": ");
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var itemIterator = TREASURE_CHEST.iterator(itemType);
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while (itemIterator.hasNext()) {
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LOGGER.info(itemIterator.next().toString());
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}
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}
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private static void demonstrateBstIterator() {
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LOGGER.info("------------------------");
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LOGGER.info("BST Iterator: ");
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var root = buildIntegerBst();
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var bstIterator = new BstIterator<>(root);
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while (bstIterator.hasNext()) {
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LOGGER.info("Next node: " + bstIterator.next().getVal());
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}
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}
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private static TreeNode<Integer> buildIntegerBst() {
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var root = new TreeNode<>(8);
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root.insert(3);
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root.insert(10);
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root.insert(1);
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root.insert(6);
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root.insert(14);
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root.insert(4);
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root.insert(7);
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root.insert(13);
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return root;
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}
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public static void main(String[] args) {
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demonstrateTreasureChestIteratorForType(RING);
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demonstrateTreasureChestIteratorForType(POTION);
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demonstrateTreasureChestIteratorForType(WEAPON);
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demonstrateTreasureChestIteratorForType(ANY);
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demonstrateBstIterator();
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}
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}
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```
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Program output:
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```java
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Ring of shadows
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Ring of armor
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```
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13:36:37.087 [main] INFO com.iluwatar.iterator.App -- ------------------------
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Item Iterator for ItemType RING:
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Ring of shadows
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Ring of armor
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- ------------------------
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Item Iterator for ItemType POTION:
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Potion of courage
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Potion of wisdom
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Potion of blood
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Potion of rust
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Potion of healing
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- ------------------------
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Item Iterator for ItemType WEAPON:
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Sword of silver +1
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Steel halberd
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Dagger of poison
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- ------------------------
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Item Iterator for ItemType ANY:
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Potion of courage
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Ring of shadows
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Potion of wisdom
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Potion of blood
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Sword of silver +1
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Potion of rust
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Potion of healing
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Ring of armor
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13:36:37.089 [main] INFO com.iluwatar.iterator.App -- Steel halberd
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13:36:37.090 [main] INFO com.iluwatar.iterator.App -- Dagger of poison
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13:36:37.090 [main] INFO com.iluwatar.iterator.App -- ------------------------
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13:36:37.090 [main] INFO com.iluwatar.iterator.App -- BST Iterator:
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13:36:37.090 [main] INFO com.iluwatar.iterator.App -- Next node: 1
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13:36:37.090 [main] INFO com.iluwatar.iterator.App -- Next node: 3
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13:36:37.090 [main] INFO com.iluwatar.iterator.App -- Next node: 4
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13:36:37.090 [main] INFO com.iluwatar.iterator.App -- Next node: 6
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13:36:37.090 [main] INFO com.iluwatar.iterator.App -- Next node: 7
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13:36:37.090 [main] INFO com.iluwatar.iterator.App -- Next node: 8
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13:36:37.090 [main] INFO com.iluwatar.iterator.App -- Next node: 10
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13:36:37.090 [main] INFO com.iluwatar.iterator.App -- Next node: 13
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13:36:37.090 [main] INFO com.iluwatar.iterator.App -- Next node: 14
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```
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## Class diagram
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@@ -141,7 +221,7 @@ Use the Iterator pattern
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## Tutorials
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* [How to Use Iterator?](http://www.tutorialspoint.com/java/java_using_iterator.htm)
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* [Java - How to Use Iterator? (TutorialsPoint)](http://www.tutorialspoint.com/java/java_using_iterator.htm)
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## Known uses
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