Hallo MrTiger,
Hier kannst du die B-Baum Implementierung von A bis Z Finden ..(mit Main-Methode auch also ein kleiner Beispiel )

// tree.java
// demonstrates binary tree


/* #===============#
* H ANMERKUNGEN H
* #===============#
*
* Die vorliegenden Klassen entsprechen nicht den Anforderungen, die
* wir an "ordentliche" Java-Programmierung stellen !!!
*
* Passen Sie den Quellcode dementsprechend an unsere bekannten
* Programmierrichtlinien an !!!
*
* #===============#
* H ANMERKUNGEN H
* #===============#
*/


import java.io.*; // for I/O
import java.util.*; // for Stack class
import java.lang.Integer; // for parseInt()

////////////////////////////////////////////////////////////////

class Node
{
public int iData; // data item (key)
public double dData; // data item
public Node leftChild; // this node's left child
public Node rightChild; // this node's right child

public void displayNode() // display ourself
{
System.out.print('{');
System.out.print(iData);
System.out.print(", ");
System.out.print(dData);
System.out.print("} ");
}
} // end class Node

////////////////////////////////////////////////////////////////

class Tree
{
private Node root; // first node of tree

// -------------------------------------------------------------
public Tree() // constructor
{ root = null; } // no nodes in tree yet
// -------------------------------------------------------------
public Node find(int key) // find node with given key
{ // (assumes non-empty tree)
Node current = root; // start at root
while(current.iData != key) // while no match,
{
if(key < current.iData) // go left?
current = current.leftChild;
else // or go right?
current = current.rightChild;
if(current == null) // if no child,
return null; // didn't find it
}
return current; // found it
} // end find()

//--------------------------------------------------------------
// andere version für search

/**
* Suche Daten in Baum
*
*
*/
public Object search(Object daten)
throws IllegalElementException
{
IllegalElementException.istNichtNull( daten );
IllegalElementException.istComparableNeu( daten );

return searchRekursiv(daten, root);
}

/**
* Suche Daten in Teilbaum rekursiv
*
*
*/
private Object searchRekursiv(Object daten, BiBaEle aktuell)
{
int vgl;

if (aktuell == null)
return null;

vgl = ((Comparable)daten).compareTo( aktuell.getDaten() );

if (vgl == 0) // daten gefunden
{
//return aktuell.getDaten();
return aktuell;
}
else
{
if (vgl < 0) // daten im linken Teilbaum suchen
{
return searchRekursiv(daten, aktuell.getLinks() );
}
else
{
return searchRekursiv(daten, aktuell.getRechts() );
}
}
} // SearchEnde


// -------------------------------------------------------------
public void insert(int id, double dd)
{
Node newNode = new Node(); // make new node
newNode.iData = id; // insert data
newNode.dData = dd;
if(root==null) // no node in root
root = newNode;
else // root occupied
{
Node current = root; // start at root
Node parent;
while(true) // (exits internally)
{
parent = current;
if(id < current.iData) // go left?
{
current = current.leftChild;
if(current == null) // if end of the line,
{ // insert on left
parent.leftChild = newNode;
return;
}
} // end if go left
else // or go right?
{
current = current.rightChild;
if(current == null) // if end of the line
{ // insert on right
parent.rightChild = newNode;
return;
}
} // end else go right
} // end while
} // end else not root
} // end insert()
// -------------------------------------------------------------
public boolean delete(int key) // delete node with given key
{ // (assumes non-empty list)
Node current = root;
Node parent = root;
boolean isLeftChild = true;

while(current.iData != key) // search for node
{
parent = current;
if(key < current.iData) // go left?
{
isLeftChild = true;
current = current.leftChild;
}
else // or go right?
{
isLeftChild = false;
current = current.rightChild;
}
if(current == null) // end of the line,
return false; // didn't find it
} // end while
// found node to delete

// if no children, simply delete it
if(current.leftChild==null && current.rightChild==null)
{
if(current == root) // if root,
root = null; // tree is empty
else if(isLeftChild)
parent.leftChild = null; // disconnect
else // from parent
parent.rightChild = null;
}

// if no right child, replace with left subtree
else if(current.rightChild==null)
if(current == root)
root = current.leftChild;
else if(isLeftChild)
parent.leftChild = current.leftChild;
else
parent.rightChild = current.leftChild;

// if no left child, replace with right subtree
else if(current.leftChild==null)
if(current == root)
root = current.rightChild;
else if(isLeftChild)
parent.leftChild = current.rightChild;
else
parent.rightChild = current.rightChild;

else // two children, so replace with inorder successor
{
// get successor of node to delete (current)
Node successor = getSuccessor(current);

// connect parent of current to successor instead
if(current == root)
root = successor;
else if(isLeftChild)
parent.leftChild = successor;
else
parent.rightChild = successor;

// connect successor to current's left child
successor.leftChild = current.leftChild;
} // end else two children
// (successor cannot have a left child)
return true; // success
} // end delete()
// -------------------------------------------------------------
// returns node with next-highest value after delNode
// goes to right child, then right child's left descendents
private Node getSuccessor(Node delNode)
{
Node successorParent = delNode;
Node successor = delNode;
Node current = delNode.rightChild; // go to right child
while(current != null) // until no more
{ // left children,
successorParent = successor;
successor = current;
current = current.leftChild; // go to left child
}
// if successor not
if(successor != delNode.rightChild) // right child,
{ // make connections
successorParent.leftChild = successor.rightChild;
successor.rightChild = delNode.rightChild;
}
return successor;
}
// -------------------------------------------------------------
public void traverse(int traverseType)
{
switch(traverseType)
{
case 1: System.out.print("\nPreorder traversal: ");
preOrder(root);
break;
case 2: System.out.print("\nInorder traversal: ");
inOrder(root);
break;
case 3: System.out.print("\nPostorder traversal: ");
postOrder(root);
break;
}
System.out.println();
}
// -------------------------------------------------------------
private void preOrder(Node localRoot)
{
if(localRoot != null)
{
localRoot.displayNode();
preOrder(localRoot.leftChild);
preOrder(localRoot.rightChild);
}
}
// -------------------------------------------------------------
private void inOrder(Node localRoot)
{
if(localRoot != null)
{
inOrder(localRoot.leftChild);
localRoot.displayNode();
inOrder(localRoot.rightChild);
}
}
// -------------------------------------------------------------
private void postOrder(Node localRoot)
{
if(localRoot != null)
{
postOrder(localRoot.leftChild);
postOrder(localRoot.rightChild);
localRoot.displayNode();
}
}
// -------------------------------------------------------------
public void displayTree()
{
Stack globalStack = new Stack();
globalStack.push(root);
int nBlanks = 32;
boolean isRowEmpty = false;
System.out.println(
"......................................................");
while(isRowEmpty==false)
{
Stack localStack = new Stack();
isRowEmpty = true;

for(int j=0; j<nBlanks; j++)
System.out.print(' ');

while(globalStack.isEmpty()==false)
{
Node temp = (Node)globalStack.pop();
if(temp != null)
{
System.out.print(temp.iData);
localStack.push(temp.leftChild);
localStack.push(temp.rightChild);

if(temp.leftChild != null
temp.rightChild != null)
isRowEmpty = false;
}
else
{
System.out.print("--");
localStack.push(null);
localStack.push(null);
}
for(int j=0; j<nBlanks*2-2; j++)
System.out.print(' ');
} // end while globalStack not empty
System.out.println();
nBlanks /= 2;
while(localStack.isEmpty()==false)
globalStack.push( localStack.pop() );
} // end while isRowEmpty is false
System.out.println(
"......................................................");
} // end displayTree()
// -------------------------------------------------------------
} // end class Tree

////////////////////////////////////////////////////////////////

class TreeApp
{
public static void main(String[] args) throws IOException
{
int value;
Tree theTree = new Tree();

theTree.insert(50, 1.5);
theTree.insert(25, 1.2);
theTree.insert(75, 1.7);
theTree.insert(12, 1.5);
theTree.insert(37, 1.2);
theTree.insert(43, 1.7);
theTree.insert(30, 1.5);
theTree.insert(33, 1.2);
theTree.insert(87, 1.7);
theTree.insert(93, 1.5);
theTree.insert(97, 1.5);

while(true)
{
putText("Enter first letter of ");
putText("show, insert, find, delete, or traverse: ");
int choice = getChar();
switch(choice)
{
case 's':
theTree.displayTree();
break;
case 'i':
putText("Enter value to insert: ");
value = getInt();
theTree.insert(value, value + 0.9);
break;
case 'f':
putText("Enter value to find: ");
value = getInt();
Node found = theTree.find(value);
if(found != null)
{
putText("Found: ");
found.displayNode();
putText("\n");
}
else
putText("Could not find " + value + '\n');
break;
case 'd':
putText("Enter value to delete: ");
value = getInt();
boolean didDelete = theTree.delete(value);
if(didDelete)
putText("Deleted " + value + '\n');
else
putText("Could not delete " + value + '\n');
break;
case 't':
putText("Enter type 1, 2 or 3: ");
value = getInt();
theTree.traverse(value);
break;
default:
putText("Invalid entry\n");
} // end switch
} // end while
} // end main()
// -------------------------------------------------------------
public static void putText(String s)
{
System.out.print(s);
System.out.flush();
}
// -------------------------------------------------------------
public static String getString() throws IOException
{
InputStreamReader isr = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(isr);
String s = br.readLine();
return s;
}
// -------------------------------------------------------------
public static char getChar() throws IOException
{
String s = getString();
return s.charAt(0);
}

//-------------------------------------------------------------
public static int getInt() throws IOException
{
String s = getString();
return Integer.parseInt(s);
}
// -------------------------------------------------------------
} // end class TreeApp


Josef

Josef, eventuell solltest du den Code in die Tags packen, die hier im Forum angeboten werden. Sowas erhöht die Lesbarkeit. (Und wenn du dabei bist, kannst ja mal ein Copyright bzw. ein Infolink zur Quelle hinzufügen)

Eventuell hilft dir das hier ja: zcu.arcao.com/kiv/pt/baobab/LECTURE/sld012.htm