Trie.java

package dsa.tries;

public class Trie{
 private Node root;

 public Trie(){
  root = new Node(' '); 
 }

 public void insert(String s){
  Node current = root; 
  if(s.length()==0) //For an empty character
   current.marker=true;
  for(int i=0;i<s.length();i++){
   Node child = current.subNode(s.charAt(i));
   if(child!=null){ 
    current = child;
   }
   else{
    current.child.add(new Node(s.charAt(i)));
    current = current.subNode(s.charAt(i));
   }
   // Set marker to indicate end of the word
   if(i==s.length()-1)
    current.marker = true;
  } 
 }

 public boolean search(String s){
  Node current = root;
  while(current != null){
   for(int i=0;i<s.length();i++){    
    if(current.subNode(s.charAt(i)) == null)
     return false;
    else
     current = current.subNode(s.charAt(i));
   }
   /* 
    * This means that a string exists, but make sure its
    * a word by checking its 'marker' flag
    */
   if (current.marker == true)
    return true;
   else
    return false;
  }
  return false; 
 }
}