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Figure 8-2 E-R diagram special cases. In Fig. 8-2, the Dependents table is an id-dependent weak entity. The identifier for that table includes the key for the related strong entity Faculty, plus the name of the dependent (spouse s name, child s name, etc.). The FacultyDegrees entity represents a multivalued attribute. A single faculty member may have multiple degrees from multiple institutions, and this entity allows us to represent that fact. Finally, the Student entity shows two subcategories of students, grads and undergrads. An undergrad will have a faculty member serving as his or her Student Life Advisor, and a grad may (or may not) have a faculty member serving as the chair of his or her thesis committee.

} if (!queue.isEmpty()) { BinaryTree<E> tree = queue.remove(); if (tree.left != null) { queue.add(tree.left); } if (tree.right != null) { queue.add(tree.right); } return tree.root; } return null; } } }

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At line 64 we define an abstract inner class named BinaryTreeIterator. This serves as a base class for all four of the concrete iterator classes. It declares the same three fields (rootDone, rIt, and lIt) as the anonymous iterator class defined previously. The hasNext() and remove() methods are implemented (at lines 57 and 62) the same way the abstract Iterator class was done in the anonymous iterator class. But the next() method is declared abstract because each of the four traversal algorithms has a different implementation of it. The PreOrder class defines the lIt and rIt iterators to be PreOrder iterators in its constructor to ensure that the recursive traversal follows the preorder traversal algorithm. That algorithm (Algorithm 11.3 on page 208) says to visit the root first, and then apply the same algorithm recursively to the left subtree and then to the right subtree. The three if statements do that at lies 77 86. The only differences between the PreOrder, InOrder, and PostOrder classes are their definitions of the recursive rIt and lIt iterators in the constructors and the order of those three if statements in the next() methods. For the InOrder class, the order visits the root between the two recursive traversals. For the PostOrder class, the order visits the root after the two recursive traversals. ( Pre means before, in means between, and post means after.) The LevelOrder traversal class is significantly different from the other three. Instead of being recursive, it uses a queue. (See Algorithm 11.5 on page 209.)

BUILDING A RELATIONAL DATABASE FROM THE DATA MODEL The data model comprises the conceptual schema, or the description of the structure of the database This is one of three schemas, or designs that database developers refer to The other schemas include the external schema, which is the database as conceived by the end-users, and the internal schema, which is the set of actual file structures on disk used by the database management system (SQL Server, Oracle, etc) With the conceptual schema created, the next task is to convert the data model into tables, relationships, and data integrity rules An entity type is represented as a table, where each row in the table represents an instance of that entity type In relational database terminology, a table is called a relation Note that a relation is a table, not a relationship Later we will also create means to represent relationships.

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public class TestIterators { public static void main(String[] args) { BinaryTree<String> e = new BinaryTree<String>("E"); BinaryTree<String> g = new BinaryTree<String>("G"); BinaryTree<String> h = new BinaryTree<String>("H"); BinaryTree<String> i = new BinaryTree<String>("I"); BinaryTree<String> d = new BinaryTree<String>("D",null,g); BinaryTree<String> f = new BinaryTree<String>("F",h,i); BinaryTree<String> b = new BinaryTree<String>("B",d,e); BinaryTree<String> c = new BinaryTree<String>("C",f,null); BinaryTree<String> tree = new BinaryTree<String>("A",b,c); System.out.println("tree = " + tree); java.util.Iterator it; System.out.print("PreOrder Traversal: "); for (it = tree.new PreOrder(); it.hasNext(); ) { System.out.print(it.next() + " "); } System.out.print("\nInOrder Traversal: ");

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