vb.net code to generate barcode Actually, the equals() and hashCode() methods are defined in the Object class and do not have in Java

Maker EAN-13 in Java Actually, the equals() and hashCode() methods are defined in the Object class and do not have

1. Actually, the equals() and hashCode() methods are defined in the Object class and do not have
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to be overridden.
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BINARY TREES
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[CHAP. 11
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The next() method also uses the lIt and rIt iterators recursively. If the root has already been visited, then the iterator visits the next node in the left subtree if there are any, and otherwise visits the next node in the right subtree if there are any. If the root has not yet been visited, then this must be the first call to the iterator on that particular subtree, so it initializes the lIt and rIt iterators, sets the rootDone flag, and returns the root. The remove() method is not implemented because there is no simple way to remove an internal node from a binary tree.
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EXAMPLE 11.21 Testing the BinaryTree Class
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public class TestBinaryTree { static public 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.printf("tree: %s", tree); } }
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The output is:
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tree: [A, B, D, G, E, C, F, H, I]
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The program creates the binary tree shown in Figure 11.21 and then indirectly invokes its toString() method that it inherits from the AbstractCollections class. Figure 11.21 shows two views of the same tree. The larger view shows all the details, representing each object reference with an arrow.
Figure 11.21 The binary tree constructed in Example 11.21
CHAP. 11]
BINARY TREES
By extending the AbstractCollection class, the BinaryTree class automatically inherits these methods that are defined by using the iterator() and size() methods:
isEmpty() contains(Object object) toArray() toArray(Object[] objects) toString() add(Object object) addAll(Collection collection) clear() containsAll(Collection collection) remove(Object object) removeAll(Collection collection) retainAll(Collection collection) However, the mutating methods will throw an UnsupportedOperationException because they invoke other methods that are not implemented, namely the add() and the Iterator.remove() methods. public public public public public public public public public public public public boolean boolean Object[] Object[] String boolean boolean void boolean boolean boolean boolean
EXAMPLE 11.22 Testing the contains() Method on a Binary Tree
This example builds the same tree as the one in Example 11.21 and then tests the contains() method on it and its subtrees:
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public class TestContains { static public 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> a = new BinaryTree<String>("A", b, c); System.out.printf("a: %s%n", a); System.out.println("a.contains(\"H\") = " + a.contains("H")); System.out.printf("b: %s%n", b); System.out.println("b.contains(\"H\") = " + b.contains("H")); System.out.printf("c: %s%n", c); System.out.println("c.contains(\"H\") = " + c.contains("H")); } }
The output is:
a: [A, B, D, G, a.contains("H") b: [B, D, G, E] b.contains("H") c: [C, F, H, I] c.contains("H") E, C, F, H, I] = true = false = true
The subtrees b and c are shown in Figure 11.22. The tree a contains the element H. The subtree b does not contain the element H. The subtree c does contain the element H.
BINARY TREES
[CHAP. 11
IMPLEMENTATIONS OF THE TRAVERSAL ALGORITHMS The iterator that is returned by the iterator() method follows the preorder traversal algorithm (Algorithm 11.3 on page 208) to traverse the binary tree. The following modification of the BinaryTree class implements all four of the binary tree traversal algorithms. EXAMPLE 11.23 Implementing the Four Traversal Algorithms
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public class BinaryTree<E> extends AbstractCollection { // insert lines 2-49 from Example 11.20 on page 212 public Iterator iterator() { return new PreOrder(); } abstract public class BinaryTreeIterator implements Iterator { protected boolean rootDone; protected Iterator lIt, rIt; // child iterators public boolean hasNext() { return !rootDone || lIt != null && lIt.hasNext() || rIt != null && rIt.hasNext(); } abstract public Object next(); public void remove() { throw new UnsupportedOperationException(); } } public class PreOrder extends BinaryTreeIterator { public PreOrder() { if (left != null) { lIt = left.new PreOrder(); } if (right != null) { rIt = right.new PreOrder(); } } public Object next() { if (!rootDone) { rootDone = true; return root; } if (lIt != null && lIt.hasNext()) { return lIt.next(); } if (rIt != null && rIt.hasNext()) { return rIt.next(); } return null; } } public class InOrder extends BinaryTreeIterator { public InOrder() { if (left != null) { lIt = left.new InOrder(); }
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