tree

abstract class Tree<T>{	private Node root;	private String[] str;		public Tree(String s){		str = s.split();	}	public void addNode(){					}	abstract void traverse;	abstract void parseToTree();//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++	private class InternalNode<T> extends Node<T>{				public InternalNode(Node l, Node r, Node p, T elem){			isLeaf = false;			super(l, r, p, elem);		}		}	//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++	private class LeafNode extends Node{				public LeafNode(null, null, Node p, T elem){			isLeaf = true;			super(l, r, p, elem);		}			}//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++	abstract class Node<T>{		private Node left;		private Node right;		private Node parent;		private T element;		private boolean isLeaf = null;		public Node(Node l, Node r, Node p, T elem){			left = l;			right = r;			parent = p;			element = elem;		}				public Node getLeft(){			return left;		}		public Node getRight(){			return right;		}		public Node getParent(){			return parent;		}		public T getElem(){			return elem;		}					public 	}}