Binary Tree
/*
DEVELOPING GAME IN JAVA
Caracteristiques
Editeur : NEW RIDERS
Auteur : BRACKEEN
Parution : 09 2003
Pages : 972
Isbn : 1-59273-005-1
Reliure : Paperback
Disponibilite : Disponible a la librairie
*/
public class BinaryTreeTest {
public static void main(String[] args) {
new BinaryTreeTest().run();
}
static class Node {
Node left;
Node right;
int value;
public Node(int value) {
this.value = value;
}
}
public void run() {
// build the simple tree from chapter 11.
Node root = new Node(5);
System.out.println("Binary Tree Example");
System.out.println("Building tree with root value " + root.value);
insert(root, 1);
insert(root, 8);
insert(root, 6);
insert(root, 3);
insert(root, 9);
System.out.println("Traversing tree in order");
printInOrder(root);
System.out.println("Traversing tree front-to-back from location 7");
printFrontToBack(root, 7);
}
public void insert(Node node, int value) {
if (value < node.value) {
if (node.left != null) {
insert(node.left, value);
} else {
System.out.println(" Inserted " + value + " to left of "
+ node.value);
node.left = new Node(value);
}
} else if (value > node.value) {
if (node.right != null) {
insert(node.right, value);
} else {
System.out.println(" Inserted " + value + " to right of "
+ node.value);
node.right = new Node(value);
}
}
}
public void printInOrder(Node node) {
if (node != null) {
printInOrder(node.left);
System.out.println(" Traversed " + node.value);
printInOrder(node.right);
}
}
/**
* uses in-order traversal when the origin is less than the node's value
*
* uses reverse-order traversal when the origin is greater than the node's
* order
*/
public void printFrontToBack(Node node, int camera) {
if (node == null)
return;
if (node.value > camera) {
// print in order
printFrontToBack(node.left, camera);
System.out.println(" Traversed " + node.value);
printFrontToBack(node.right, camera);
} else if (node.value < camera) {
// print reverse order
printFrontToBack(node.right, camera);
System.out.println(" Traversed " + node.value);
printFrontToBack(node.left, camera);
} else {
// order doesn't matter
printFrontToBack(node.left, camera);
printFrontToBack(node.right, camera);
}
}
}
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