I am trying to quickly implement a Binary search tree in Java. What is the best class to use that has methods for in-order traversal? (I have heard of TreeMap class. But it looks like the class does not contain any methods to do in-order traversal).

Thank you.

Use LinkedHashMap to traverse in insertion order or TreeMap to traverse in comparison order http://docs.oracle.com/javase/6/docs/api/java/util/LinkedHashMap.html

I dont think any standard library is available for this. Check this link for sample implementation http://www.java-tips.org/java-se-tips/java.lang/binary-search-tree-implementation-in-java.html

You could always just make your own class and that implements the algo using said class.

```
public class Node {
Node leftChild;
Node rightChild;
int parent;
Node(int parent) {
this.parent = parent;
}
}
```

And then implement the Binary Search Tree class. This was made very fast, but it's to give you an idea.

```
public class BSTree {
Node root;
BSTree() {
root = null;
}
public void insert(Node node, int value) {
if (value >= node.parent) {
if (!(node.rightChild == null)) {
insert(node.rightChild, value);
} else {
node.rightChild = new Node(value);
}
} else if (value < node.parent) {
if (!(node.leftChild == null)) {
insert(node.leftChild, value);
} else {
node.leftChild = new Node(value);
}
} else {
root = new Node(value);
}
}
public boolean delete(Node node, int value) {
if (root == null) {
return false;
} else if (value > root.parent) {
return delete(root.rightChild, value);
} else if (value < root.parent) {
return delete(root.leftChild, value);
} else {
if (root.leftChild == null && root.rightChild == null) {
root = null;
return true;
} else if (root.leftChild == null && root.rightChild != null) {
root = root.rightChild;
return true;
} else if (root.leftChild != null && root.rightChild == null) {
root = root.leftChild;
return true;
} else {
Node minRight = minNode(root.rightChild);
root = minRight;
delete(minRight, minRight.parent);
return true;
}
}
}
public Node minNode(Node node) {
if (node.leftChild == null) {
return node;
} else {
return minNode(node.leftChild);
}
}
}
```

The TreeSet class might be what you want

```
class Node implements Comparable<Node>; // implements your Node class
TreeSet<Node> set = new TreeSet<Node>();
// after adding a bunch of nodes into set
Iterator<Node> it = set.iterator();
while(it.hasNext()){
Node current = it.next();
System.out.println(current); // operate on current node
}
Node first = set.first(); // smallest element in set
Node second = set.ceiling(first); // the successor method
```

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